diff --git a/Marlin/src/HAL/AVR/eeprom.cpp b/Marlin/src/HAL/AVR/eeprom.cpp
index 0519e5732..7f4384215 100644
--- a/Marlin/src/HAL/AVR/eeprom.cpp
+++ b/Marlin/src/HAL/AVR/eeprom.cpp
@@ -32,7 +32,10 @@
 
 #include "../shared/eeprom_api.h"
 
-size_t PersistentStore::capacity()    { return E2END + 1; }
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE size_t(E2END + 1)
+#endif
+size_t PersistentStore::capacity()    { return MARLIN_EEPROM_SIZE; }
 bool PersistentStore::access_start()  { return true; }
 bool PersistentStore::access_finish() { return true; }
 
diff --git a/Marlin/src/HAL/DUE/eeprom_flash.cpp b/Marlin/src/HAL/DUE/eeprom_flash.cpp
index c07d05adf..cb27e23c5 100644
--- a/Marlin/src/HAL/DUE/eeprom_flash.cpp
+++ b/Marlin/src/HAL/DUE/eeprom_flash.cpp
@@ -26,10 +26,6 @@
 
 #if ENABLED(FLASH_EEPROM_EMULATION)
 
-#ifndef E2END
-  #define E2END 0xFFF // Default to Flash emulated EEPROM size (eeprom_emul.cpp)
-#endif
-
 /* EEPROM emulation over flash with reduced wear
  *
  * We will use 2 contiguous groups of pages as main and alternate.
@@ -973,7 +969,10 @@ static void ee_Init() {
 
 #include "../shared/eeprom_api.h"
 
-size_t PersistentStore::capacity()    { return E2END + 1; }
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE 0x1000 // 4KB
+#endif
+size_t PersistentStore::capacity()    { return MARLIN_EEPROM_SIZE; }
 bool PersistentStore::access_start()  { ee_Init();  return true; }
 bool PersistentStore::access_finish() { ee_Flush(); return true; }
 
diff --git a/Marlin/src/HAL/DUE/eeprom_wired.cpp b/Marlin/src/HAL/DUE/eeprom_wired.cpp
index a9b2cc92d..e26d19f36 100644
--- a/Marlin/src/HAL/DUE/eeprom_wired.cpp
+++ b/Marlin/src/HAL/DUE/eeprom_wired.cpp
@@ -34,7 +34,10 @@
 #include "../shared/eeprom_if.h"
 #include "../shared/eeprom_api.h"
 
-size_t PersistentStore::capacity()    { return E2END + 1; }
+#ifndef MARLIN_EEPROM_SIZE
+  #error "MARLIN_EEPROM_SIZE is required for I2C / SPI EEPROM."
+#endif
+size_t PersistentStore::capacity()    { return MARLIN_EEPROM_SIZE; }
 bool PersistentStore::access_start()  { return true; }
 bool PersistentStore::access_finish() { return true; }
 
diff --git a/Marlin/src/HAL/ESP32/eeprom.cpp b/Marlin/src/HAL/ESP32/eeprom.cpp
index 35cebb592..27974fe55 100644
--- a/Marlin/src/HAL/ESP32/eeprom.cpp
+++ b/Marlin/src/HAL/ESP32/eeprom.cpp
@@ -28,16 +28,13 @@
 #include "../shared/eeprom_api.h"
 #include <EEPROM.h>
 
-#define EEPROM_SIZE 4096
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE 0x1000 // 4KB
+#endif
+size_t PersistentStore::capacity()    { return MARLIN_EEPROM_SIZE; }
 
-bool PersistentStore::access_start() {
-  return EEPROM.begin(EEPROM_SIZE);
-}
-
-bool PersistentStore::access_finish() {
-  EEPROM.end();
-  return true;
-}
+bool PersistentStore::access_start()  { return EEPROM.begin(MARLIN_EEPROM_SIZE); }
+bool PersistentStore::access_finish() { EEPROM.end(); return true; }
 
 bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
   for (size_t i = 0; i < size; i++) {
@@ -56,7 +53,5 @@ bool PersistentStore::read_data(int &pos, uint8_t* value, size_t size, uint16_t
   return false;
 }
 
-size_t PersistentStore::capacity() { return EEPROM_SIZE; }
-
 #endif // EEPROM_SETTINGS
 #endif // ARDUINO_ARCH_ESP32
diff --git a/Marlin/src/HAL/LINUX/eeprom.cpp b/Marlin/src/HAL/LINUX/eeprom.cpp
index 7a9a1db38..50f33eae2 100644
--- a/Marlin/src/HAL/LINUX/eeprom.cpp
+++ b/Marlin/src/HAL/LINUX/eeprom.cpp
@@ -28,10 +28,15 @@
 #include "../shared/eeprom_api.h"
 #include <stdio.h>
 
-#define LINUX_EEPROM_SIZE (E2END + 1)
-uint8_t buffer[LINUX_EEPROM_SIZE];
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE 0x1000 // 4KB of Emulated EEPROM
+#endif
+
+uint8_t buffer[MARLIN_EEPROM_SIZE];
 char filename[] = "eeprom.dat";
 
+size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
+
 bool PersistentStore::access_start() {
   const char eeprom_erase_value = 0xFF;
   FILE * eeprom_file = fopen(filename, "rb");
@@ -40,8 +45,8 @@ bool PersistentStore::access_start() {
   fseek(eeprom_file, 0L, SEEK_END);
   std::size_t file_size = ftell(eeprom_file);
 
-  if (file_size < LINUX_EEPROM_SIZE) {
-    memset(buffer + file_size, eeprom_erase_value, LINUX_EEPROM_SIZE - file_size);
+  if (file_size < MARLIN_EEPROM_SIZE) {
+    memset(buffer + file_size, eeprom_erase_value, MARLIN_EEPROM_SIZE - file_size);
   }
   else {
     fseek(eeprom_file, 0L, SEEK_SET);
@@ -95,7 +100,5 @@ bool PersistentStore::read_data(int &pos, uint8_t* value, const size_t size, uin
   return bytes_read != size;  // return true for any error
 }
 
-size_t PersistentStore::capacity() { return 4096; } // 4KiB of Emulated EEPROM
-
 #endif // EEPROM_SETTINGS
 #endif // __PLAT_LINUX__
diff --git a/Marlin/src/HAL/LPC1768/eeprom_flash.cpp b/Marlin/src/HAL/LPC1768/eeprom_flash.cpp
index 3bcda68ad..759b01b36 100644
--- a/Marlin/src/HAL/LPC1768/eeprom_flash.cpp
+++ b/Marlin/src/HAL/LPC1768/eeprom_flash.cpp
@@ -46,19 +46,22 @@ extern "C" {
   #include <lpc17xx_iap.h>
 }
 
-#define SECTOR_START(sector)  ((sector < 16) ? (sector * 0x1000) : ((sector - 14) * 0x8000))
-#define EEPROM_SECTOR 29
-#define EEPROM_SIZE (4096)
-#define SECTOR_SIZE (32768)
-#define EEPROM_SLOTS (SECTOR_SIZE/EEPROM_SIZE)
-#define EEPROM_ERASE (0xFF)
-#define SLOT_ADDRESS(sector, slot) (((uint8_t *)SECTOR_START(sector)) + slot * EEPROM_SIZE)
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE 0x1000 // 4KB
+#endif
 
-static uint8_t ram_eeprom[EEPROM_SIZE] __attribute__((aligned(4))) = {0};
+#define SECTOR_START(sector)  ((sector < 16) ? (sector << 12) : ((sector - 14) << 15))
+#define EEPROM_SECTOR 29
+#define SECTOR_SIZE 32768
+#define EEPROM_SLOTS ((SECTOR_SIZE)/(MARLIN_EEPROM_SIZE))
+#define EEPROM_ERASE 0xFF
+#define SLOT_ADDRESS(sector, slot) (((uint8_t *)SECTOR_START(sector)) + slot * (MARLIN_EEPROM_SIZE))
+
+static uint8_t ram_eeprom[MARLIN_EEPROM_SIZE] __attribute__((aligned(4))) = {0};
 static bool eeprom_dirty = false;
 static int current_slot = 0;
 
-size_t PersistentStore::capacity() { return EEPROM_SIZE; }
+size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
 
 bool PersistentStore::access_start() {
   uint32_t first_nblank_loc, first_nblank_val;
@@ -71,15 +74,15 @@ bool PersistentStore::access_start() {
 
   if (status == CMD_SUCCESS) {
     // sector is blank so nothing stored yet
-    for (int i = 0; i < EEPROM_SIZE; i++) ram_eeprom[i] = EEPROM_ERASE;
+    for (int i = 0; i < MARLIN_EEPROM_SIZE; i++) ram_eeprom[i] = EEPROM_ERASE;
     current_slot = EEPROM_SLOTS;
   }
   else {
     // current slot is the first non blank one
-    current_slot = first_nblank_loc / EEPROM_SIZE;
+    current_slot = first_nblank_loc / (MARLIN_EEPROM_SIZE);
     uint8_t *eeprom_data = SLOT_ADDRESS(EEPROM_SECTOR, current_slot);
     // load current settings
-    for (int i = 0; i < EEPROM_SIZE; i++) ram_eeprom[i] = eeprom_data[i];
+    for (int i = 0; i < MARLIN_EEPROM_SIZE; i++) ram_eeprom[i] = eeprom_data[i];
   }
   eeprom_dirty = false;
 
diff --git a/Marlin/src/HAL/LPC1768/eeprom_sdcard.cpp b/Marlin/src/HAL/LPC1768/eeprom_sdcard.cpp
index aac41ab30..92a9d6f0c 100644
--- a/Marlin/src/HAL/LPC1768/eeprom_sdcard.cpp
+++ b/Marlin/src/HAL/LPC1768/eeprom_sdcard.cpp
@@ -38,7 +38,10 @@ FATFS fat_fs;
 FIL eeprom_file;
 bool eeprom_file_open = false;
 
-size_t PersistentStore::capacity() { return 4096; } // 4KiB of Emulated EEPROM
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE size_t(0x1000) // 4KiB of Emulated EEPROM
+#endif
+size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
 
 bool PersistentStore::access_start() {
   const char eeprom_erase_value = 0xFF;
diff --git a/Marlin/src/HAL/LPC1768/eeprom_wired.cpp b/Marlin/src/HAL/LPC1768/eeprom_wired.cpp
index 255ff6faa..6daedc50e 100644
--- a/Marlin/src/HAL/LPC1768/eeprom_wired.cpp
+++ b/Marlin/src/HAL/LPC1768/eeprom_wired.cpp
@@ -33,18 +33,14 @@
 #include "../shared/eeprom_if.h"
 #include "../shared/eeprom_api.h"
 
-#ifndef EEPROM_SIZE
-  #define EEPROM_SIZE           0x8000 // 32kB‬
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE           0x8000 // 32KB‬
 #endif
+size_t PersistentStore::capacity()    { return MARLIN_EEPROM_SIZE; }
 
-size_t PersistentStore::capacity()    { return EEPROM_SIZE; }
+bool PersistentStore::access_start()  { eeprom_init(); return true; }
 bool PersistentStore::access_finish() { return true; }
 
-bool PersistentStore::access_start() {
-  eeprom_init();
-  return true;
-}
-
 bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
   while (size--) {
     uint8_t v = *value;
diff --git a/Marlin/src/HAL/SAMD51/eeprom_wired.cpp b/Marlin/src/HAL/SAMD51/eeprom_wired.cpp
index e5c14e9cb..22210dc49 100644
--- a/Marlin/src/HAL/SAMD51/eeprom_wired.cpp
+++ b/Marlin/src/HAL/SAMD51/eeprom_wired.cpp
@@ -32,13 +32,13 @@
 #include "../shared/eeprom_if.h"
 #include "../shared/eeprom_api.h"
 
-size_t PersistentStore::capacity()    { return E2END + 1; }
-bool PersistentStore::access_finish() { return true; }
+#ifndef MARLIN_EEPROM_SIZE
+  #error "MARLIN_EEPROM_SIZE is required for I2C / SPI EEPROM."
+#endif
+size_t PersistentStore::capacity()    { return MARLIN_EEPROM_SIZE; }
 
-bool PersistentStore::access_start() {
-  eeprom_init();
-  return true;
-}
+bool PersistentStore::access_start()  { eeprom_init(); return true; }
+bool PersistentStore::access_finish() { return true; }
 
 bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
   while (size--) {
diff --git a/Marlin/src/HAL/STM32/eeprom_flash.cpp b/Marlin/src/HAL/STM32/eeprom_flash.cpp
index 309c5eea9..57713593c 100644
--- a/Marlin/src/HAL/STM32/eeprom_flash.cpp
+++ b/Marlin/src/HAL/STM32/eeprom_flash.cpp
@@ -32,7 +32,7 @@
   #include "Servo.h"
   #define PAUSE_SERVO_OUTPUT() libServo::pause_all_servos()
   #define RESUME_SERVO_OUTPUT() libServo::resume_all_servos()
-#else  
+#else
   #define PAUSE_SERVO_OUTPUT()
   #define RESUME_SERVO_OUTPUT()
 #endif
@@ -59,8 +59,8 @@
   #define DEBUG_OUT ENABLED(EEPROM_CHITCHAT)
   #include "src/core/debug_out.h"
 
-  #ifndef EEPROM_SIZE
-    #define EEPROM_SIZE           0x1000  // 4kB
+  #ifndef MARLIN_EEPROM_SIZE
+    #define MARLIN_EEPROM_SIZE    0x1000 // 4KB
   #endif
 
   #ifndef FLASH_SECTOR
@@ -70,11 +70,11 @@
     #define FLASH_UNIT_SIZE       0x20000 // 128kB
   #endif
 
-  #define FLASH_ADDRESS_START     (FLASH_END - ((FLASH_SECTOR_TOTAL - FLASH_SECTOR) * FLASH_UNIT_SIZE) + 1)
+  #define FLASH_ADDRESS_START     (FLASH_END - ((FLASH_SECTOR_TOTAL - (FLASH_SECTOR)) * (FLASH_UNIT_SIZE)) + 1)
   #define FLASH_ADDRESS_END       (FLASH_ADDRESS_START + FLASH_UNIT_SIZE  - 1)
 
-  #define EEPROM_SLOTS            (FLASH_UNIT_SIZE/EEPROM_SIZE)
-  #define SLOT_ADDRESS(slot)      (FLASH_ADDRESS_START + (slot * EEPROM_SIZE))
+  #define EEPROM_SLOTS            ((FLASH_UNIT_SIZE) / (MARLIN_EEPROM_SIZE))
+  #define SLOT_ADDRESS(slot)      (FLASH_ADDRESS_START + (slot * (MARLIN_EEPROM_SIZE)))
 
   #define UNLOCK_FLASH()          if (!flash_unlocked) { \
                                     HAL_FLASH_Unlock(); \
@@ -87,12 +87,12 @@
   #define EMPTY_UINT32            ((uint32_t)-1)
   #define EMPTY_UINT8             ((uint8_t)-1)
 
-  static uint8_t ram_eeprom[EEPROM_SIZE] __attribute__((aligned(4))) = {0};
+  static uint8_t ram_eeprom[MARLIN_EEPROM_SIZE] __attribute__((aligned(4))) = {0};
   static int current_slot = -1;
 
-  static_assert(0 == EEPROM_SIZE % 4, "EEPROM_SIZE must be a multiple of 4"); // Ensure copying as uint32_t is safe
-  static_assert(0 == FLASH_UNIT_SIZE % EEPROM_SIZE, "EEPROM_SIZE must divide evenly into your FLASH_UNIT_SIZE");
-  static_assert(FLASH_UNIT_SIZE >= EEPROM_SIZE, "FLASH_UNIT_SIZE must be greater than or equal to your EEPROM_SIZE");
+  static_assert(0 == MARLIN_EEPROM_SIZE % 4, "MARLIN_EEPROM_SIZE must be a multiple of 4"); // Ensure copying as uint32_t is safe
+  static_assert(0 == FLASH_UNIT_SIZE % MARLIN_EEPROM_SIZE, "MARLIN_EEPROM_SIZE must divide evenly into your FLASH_UNIT_SIZE");
+  static_assert(FLASH_UNIT_SIZE >= MARLIN_EEPROM_SIZE, "FLASH_UNIT_SIZE must be greater than or equal to your MARLIN_EEPROM_SIZE");
   static_assert(IS_FLASH_SECTOR(FLASH_SECTOR), "FLASH_SECTOR is invalid");
   static_assert(IS_POWER_OF_2(FLASH_UNIT_SIZE), "FLASH_UNIT_SIZE should be a power of 2, please check your chip's spec sheet");
 
@@ -100,6 +100,11 @@
 
 static bool eeprom_data_written = false;
 
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE size_t(E2END + 1)
+#endif
+size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
+
 bool PersistentStore::access_start() {
 
   #if ENABLED(FLASH_EEPROM_LEVELING)
@@ -113,20 +118,20 @@ bool PersistentStore::access_start() {
       while (address <= FLASH_ADDRESS_END) {
         uint32_t address_value = (*(__IO uint32_t*)address);
         if (address_value != EMPTY_UINT32) {
-          current_slot = (address - FLASH_ADDRESS_START) / EEPROM_SIZE;
+          current_slot = (address - (FLASH_ADDRESS_START)) / (MARLIN_EEPROM_SIZE);
           break;
         }
         address += sizeof(uint32_t);
       }
       if (current_slot == -1) {
         // We didn't find anything, so we'll just intialize to empty
-        for (int i = 0; i < EEPROM_SIZE; i++) ram_eeprom[i] = EMPTY_UINT8;
+        for (int i = 0; i < MARLIN_EEPROM_SIZE; i++) ram_eeprom[i] = EMPTY_UINT8;
         current_slot = EEPROM_SLOTS;
       }
       else {
         // load current settings
         uint8_t *eeprom_data = (uint8_t *)SLOT_ADDRESS(current_slot);
-        for (int i = 0; i < EEPROM_SIZE; i++) ram_eeprom[i] = eeprom_data[i];
+        for (int i = 0; i < MARLIN_EEPROM_SIZE; i++) ram_eeprom[i] = eeprom_data[i];
         DEBUG_ECHOLNPAIR("EEPROM loaded from slot ", current_slot, ".");
       }
       eeprom_data_written = false;
@@ -146,7 +151,7 @@ bool PersistentStore::access_finish() {
       // MCU may come up with flash error bits which prevent some flash operations.
       // Clear flags prior to flash operations to prevent errors.
       __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR | FLASH_FLAG_PGSERR);
-    #endif    
+    #endif
 
     #if ENABLED(FLASH_EEPROM_LEVELING)
 
@@ -185,7 +190,7 @@ bool PersistentStore::access_finish() {
 
       uint32_t offset = 0;
       uint32_t address = SLOT_ADDRESS(current_slot);
-      uint32_t address_end = address + EEPROM_SIZE;
+      uint32_t address_end = address + MARLIN_EEPROM_SIZE;
       uint32_t data = 0;
 
       bool success = true;
@@ -267,9 +272,5 @@ bool PersistentStore::read_data(int &pos, uint8_t* value, size_t size, uint16_t
   return false;
 }
 
-size_t PersistentStore::capacity() {
-  return TERN(FLASH_EEPROM_LEVELING, EEPROM_SIZE, E2END + 1);
-}
-
 #endif // FLASH_EEPROM_EMULATION
 #endif // ARDUINO_ARCH_STM32 && !STM32GENERIC
diff --git a/Marlin/src/HAL/STM32/eeprom_sdcard.cpp b/Marlin/src/HAL/STM32/eeprom_sdcard.cpp
index 2b89c21b8..2fcf5ec3d 100644
--- a/Marlin/src/HAL/STM32/eeprom_sdcard.cpp
+++ b/Marlin/src/HAL/STM32/eeprom_sdcard.cpp
@@ -31,53 +31,44 @@
 #if ENABLED(SDCARD_EEPROM_EMULATION)
 
 #include "../shared/eeprom_api.h"
+#include "../../sd/cardreader.h"
 
-#ifndef E2END
-  #define E2END 0xFFF // 4KB
+#define EEPROM_FILENAME "eeprom.dat"
+
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE 0x1000 // 4KB
 #endif
-#define HAL_EEPROM_SIZE int(E2END + 1)
+size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
 
 #define _ALIGN(x) __attribute__ ((aligned(x)))
-static char _ALIGN(4) HAL_eeprom_data[HAL_EEPROM_SIZE];
+static char _ALIGN(4) HAL_eeprom_data[MARLIN_EEPROM_SIZE];
 
-#if ENABLED(SDSUPPORT)
+bool PersistentStore::access_start() {
+  if (!card.isMounted()) return false;
 
-  #include "../../sd/cardreader.h"
-
-  #define EEPROM_FILENAME "eeprom.dat"
-
-  bool PersistentStore::access_start() {
-    if (!card.isMounted()) return false;
-
-    SdFile file, root = card.getroot();
-    if (!file.open(&root, EEPROM_FILENAME, O_RDONLY))
-      return true;
-
-    int bytes_read = file.read(HAL_eeprom_data, HAL_EEPROM_SIZE);
-    if (bytes_read < 0) return false;
-    for (; bytes_read < HAL_EEPROM_SIZE; bytes_read++)
-      HAL_eeprom_data[bytes_read] = 0xFF;
-    file.close();
+  SdFile file, root = card.getroot();
+  if (!file.open(&root, EEPROM_FILENAME, O_RDONLY))
     return true;
+
+  int bytes_read = file.read(HAL_eeprom_data, MARLIN_EEPROM_SIZE);
+  if (bytes_read < 0) return false;
+  for (; bytes_read < MARLIN_EEPROM_SIZE; bytes_read++)
+    HAL_eeprom_data[bytes_read] = 0xFF;
+  file.close();
+  return true;
+}
+
+bool PersistentStore::access_finish() {
+  if (!card.isMounted()) return false;
+
+  SdFile file, root = card.getroot();
+  int bytes_written = 0;
+  if (file.open(&root, EEPROM_FILENAME, O_CREAT | O_WRITE | O_TRUNC)) {
+    bytes_written = file.write(HAL_eeprom_data, MARLIN_EEPROM_SIZE);
+    file.close();
   }
-
-  bool PersistentStore::access_finish() {
-    if (!card.isMounted()) return false;
-
-    SdFile file, root = card.getroot();
-    int bytes_written = 0;
-    if (file.open(&root, EEPROM_FILENAME, O_CREAT | O_WRITE | O_TRUNC)) {
-      bytes_written = file.write(HAL_eeprom_data, HAL_EEPROM_SIZE);
-      file.close();
-    }
-    return (bytes_written == HAL_EEPROM_SIZE);
-  }
-
-#else // !SDSUPPORT
-
-  #error "Please define an EEPROM, a SDCARD or disable EEPROM_SETTINGS."
-
-#endif // !SDSUPPORT
+  return (bytes_written == MARLIN_EEPROM_SIZE);
+}
 
 bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
   for (size_t i = 0; i < size; i++)
@@ -97,7 +88,5 @@ bool PersistentStore::read_data(int &pos, uint8_t* value, const size_t size, uin
   return false;
 }
 
-size_t PersistentStore::capacity() { return HAL_EEPROM_SIZE; }
-
 #endif // SDCARD_EEPROM_EMULATION
 #endif // STM32 && !STM32GENERIC
diff --git a/Marlin/src/HAL/STM32/eeprom_sram.cpp b/Marlin/src/HAL/STM32/eeprom_sram.cpp
index 0993dee33..640631428 100644
--- a/Marlin/src/HAL/STM32/eeprom_sram.cpp
+++ b/Marlin/src/HAL/STM32/eeprom_sram.cpp
@@ -29,7 +29,11 @@
 #include "../shared/eeprom_if.h"
 #include "../shared/eeprom_api.h"
 
-size_t PersistentStore::capacity()    { return 4096; } // 4K of SRAM
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE 0x1000 // 4KB
+#endif
+size_t PersistentStore::capacity()    { return MARLIN_EEPROM_SIZE; }
+
 bool PersistentStore::access_start()  { return true; }
 bool PersistentStore::access_finish() { return true; }
 
diff --git a/Marlin/src/HAL/STM32/eeprom_wired.cpp b/Marlin/src/HAL/STM32/eeprom_wired.cpp
index 084b9e6ea..7fe1116d6 100644
--- a/Marlin/src/HAL/STM32/eeprom_wired.cpp
+++ b/Marlin/src/HAL/STM32/eeprom_wired.cpp
@@ -34,13 +34,13 @@
 #include "../shared/eeprom_if.h"
 #include "../shared/eeprom_api.h"
 
-size_t PersistentStore::capacity()    { return E2END + 1; }
-bool PersistentStore::access_finish() { return true; }
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE size_t(E2END + 1)
+#endif
+size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
 
-bool PersistentStore::access_start()  {
-  eeprom_init();
-  return true;
-}
+bool PersistentStore::access_start()  { eeprom_init(); return true; }
+bool PersistentStore::access_finish() { return true; }
 
 bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
   while (size--) {
diff --git a/Marlin/src/HAL/STM32F1/eeprom_flash.cpp b/Marlin/src/HAL/STM32F1/eeprom_flash.cpp
index 9c8173046..57a2bc5be 100644
--- a/Marlin/src/HAL/STM32F1/eeprom_flash.cpp
+++ b/Marlin/src/HAL/STM32F1/eeprom_flash.cpp
@@ -39,18 +39,20 @@
 #include <EEPROM.h>
 
 // Store settings in the last two pages
-#define EEPROM_SIZE (EEPROM_PAGE_SIZE * 2)
-#define ACCESS_FINISHED(TF) do{ FLASH_Lock(); eeprom_dirty = false; return TF; }while(0)
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE ((EEPROM_PAGE_SIZE) * 2)
+#endif
+size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
 
-static uint8_t ram_eeprom[EEPROM_SIZE] __attribute__((aligned(4))) = {0};
+static uint8_t ram_eeprom[MARLIN_EEPROM_SIZE] __attribute__((aligned(4))) = {0};
 static bool eeprom_dirty = false;
 
 bool PersistentStore::access_start() {
   const uint32_t* source = reinterpret_cast<const uint32_t*>(EEPROM_PAGE0_BASE);
   uint32_t* destination = reinterpret_cast<uint32_t*>(ram_eeprom);
 
-  static_assert(0 == EEPROM_SIZE % 4, "EEPROM_SIZE is corrupted. (Must be a multiple of 4.)"); // Ensure copying as uint32_t is safe
-  constexpr size_t eeprom_size_u32 = EEPROM_SIZE / 4;
+  static_assert(0 == (MARLIN_EEPROM_SIZE) % 4, "MARLIN_EEPROM_SIZE is corrupted. (Must be a multiple of 4.)"); // Ensure copying as uint32_t is safe
+  constexpr size_t eeprom_size_u32 = (MARLIN_EEPROM_SIZE) / 4;
 
   for (size_t i = 0; i < eeprom_size_u32; ++i, ++destination, ++source)
     *destination = *source;
@@ -72,13 +74,15 @@ bool PersistentStore::access_finish() {
     // page changes...either way, something to look at later.
     FLASH_Unlock();
 
+    #define ACCESS_FINISHED(TF) { FLASH_Lock(); eeprom_dirty = false; return TF; }
+
     status = FLASH_ErasePage(EEPROM_PAGE0_BASE);
     if (status != FLASH_COMPLETE) ACCESS_FINISHED(true);
     status = FLASH_ErasePage(EEPROM_PAGE1_BASE);
     if (status != FLASH_COMPLETE) ACCESS_FINISHED(true);
 
     const uint16_t *source = reinterpret_cast<const uint16_t*>(ram_eeprom);
-    for (size_t i = 0; i < EEPROM_SIZE; i += 2, ++source) {
+    for (size_t i = 0; i < MARLIN_EEPROM_SIZE; i += 2, ++source) {
       if (FLASH_ProgramHalfWord(EEPROM_PAGE0_BASE + i, *source) != FLASH_COMPLETE)
         ACCESS_FINISHED(false);
     }
@@ -105,7 +109,5 @@ bool PersistentStore::read_data(int &pos, uint8_t* value, const size_t size, uin
   return false;  // return true for any error
 }
 
-size_t PersistentStore::capacity() { return EEPROM_SIZE; }
-
 #endif // FLASH_EEPROM_EMULATION
 #endif // __STM32F1__
diff --git a/Marlin/src/HAL/STM32F1/eeprom_sdcard.cpp b/Marlin/src/HAL/STM32F1/eeprom_sdcard.cpp
index bfa9b78dc..0ca6900fa 100644
--- a/Marlin/src/HAL/STM32F1/eeprom_sdcard.cpp
+++ b/Marlin/src/HAL/STM32F1/eeprom_sdcard.cpp
@@ -34,15 +34,15 @@
 #include "../shared/eeprom_api.h"
 #include "../../sd/cardreader.h"
 
-#ifndef E2END
-  #define E2END 0xFFF // 4KB
+#define EEPROM_FILENAME "eeprom.dat"
+
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE 0x1000 // 4KB
 #endif
-#define HAL_EEPROM_SIZE (E2END + 1)
+size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
 
 #define _ALIGN(x) __attribute__ ((aligned(x))) // SDIO uint32_t* compat.
-static char _ALIGN(4) HAL_eeprom_data[HAL_EEPROM_SIZE];
-
-#define EEPROM_FILENAME "eeprom.dat"
+static char _ALIGN(4) HAL_eeprom_data[MARLIN_EEPROM_SIZE];
 
 bool PersistentStore::access_start() {
   if (!card.isMounted()) return false;
@@ -51,9 +51,9 @@ bool PersistentStore::access_start() {
   if (!file.open(&root, EEPROM_FILENAME, O_RDONLY))
     return true; // false aborts the save
 
-  int bytes_read = file.read(HAL_eeprom_data, HAL_EEPROM_SIZE);
+  int bytes_read = file.read(HAL_eeprom_data, MARLIN_EEPROM_SIZE);
   if (bytes_read < 0) return false;
-  for (; bytes_read < HAL_EEPROM_SIZE; bytes_read++)
+  for (; bytes_read < MARLIN_EEPROM_SIZE; bytes_read++)
     HAL_eeprom_data[bytes_read] = 0xFF;
   file.close();
   return true;
@@ -65,10 +65,10 @@ bool PersistentStore::access_finish() {
   SdFile file, root = card.getroot();
   int bytes_written = 0;
   if (file.open(&root, EEPROM_FILENAME, O_CREAT | O_WRITE | O_TRUNC)) {
-    bytes_written = file.write(HAL_eeprom_data, HAL_EEPROM_SIZE);
+    bytes_written = file.write(HAL_eeprom_data, MARLIN_EEPROM_SIZE);
     file.close();
   }
-  return (bytes_written == HAL_EEPROM_SIZE);
+  return (bytes_written == MARLIN_EEPROM_SIZE);
 }
 
 bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
@@ -89,7 +89,5 @@ bool PersistentStore::read_data(int &pos, uint8_t* value, const size_t size, uin
   return false;
 }
 
-size_t PersistentStore::capacity() { return HAL_EEPROM_SIZE; }
-
 #endif // SDCARD_EEPROM_EMULATION
 #endif // __STM32F1__
diff --git a/Marlin/src/HAL/STM32F1/eeprom_wired.cpp b/Marlin/src/HAL/STM32F1/eeprom_wired.cpp
index 8d584c67b..545405317 100644
--- a/Marlin/src/HAL/STM32F1/eeprom_wired.cpp
+++ b/Marlin/src/HAL/STM32F1/eeprom_wired.cpp
@@ -31,7 +31,12 @@
 #include "../shared/eeprom_if.h"
 #include "../shared/eeprom_api.h"
 
-size_t PersistentStore::capacity()    { return E2END + 1; }
+#ifndef MARLIN_EEPROM_SIZE
+  #error "MARLIN_EEPROM_SIZE is required for I2C / SPI EEPROM."
+#endif
+size_t PersistentStore::capacity()    { return MARLIN_EEPROM_SIZE; }
+
+bool PersistentStore::access_finish() { return true; }
 
 bool PersistentStore::access_start() {
   #if ENABLED(SPI_EEPROM)
@@ -45,7 +50,6 @@ bool PersistentStore::access_start() {
   #endif
   return true;
 }
-bool PersistentStore::access_finish() { return true; }
 
 bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
   while (size--) {
diff --git a/Marlin/src/HAL/STM32_F4_F7/eeprom_flash.cpp b/Marlin/src/HAL/STM32_F4_F7/eeprom_flash.cpp
index 85503a56e..48c0b7703 100644
--- a/Marlin/src/HAL/STM32_F4_F7/eeprom_flash.cpp
+++ b/Marlin/src/HAL/STM32_F4_F7/eeprom_flash.cpp
@@ -52,10 +52,14 @@ uint8_t ee_read_byte(uint8_t *pos) {
   return uint8_t(data);
 }
 
-size_t PersistentStore::capacity()    { return E2END + 1; }
+#ifndef MARLIN_EEPROM_SIZE
+  #error "MARLIN_EEPROM_SIZE is required for Flash-based EEPROM."
+#endif
+size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
+
 bool PersistentStore::access_finish() { return true; }
 
-bool PersistentStore::access_start()  {
+bool PersistentStore::access_start() {
   static bool ee_initialized = false;
   if (!ee_initialized) {
     HAL_FLASH_Unlock();
diff --git a/Marlin/src/HAL/STM32_F4_F7/eeprom_wired.cpp b/Marlin/src/HAL/STM32_F4_F7/eeprom_wired.cpp
index 08c3c3052..b362503a6 100644
--- a/Marlin/src/HAL/STM32_F4_F7/eeprom_wired.cpp
+++ b/Marlin/src/HAL/STM32_F4_F7/eeprom_wired.cpp
@@ -34,13 +34,13 @@
 #include "../shared/eeprom_if.h"
 #include "../shared/eeprom_api.h"
 
-size_t PersistentStore::capacity()    { return E2END + 1; }
-bool PersistentStore::access_finish() { return true; }
+#ifndef MARLIN_EEPROM_SIZE
+  #error "MARLIN_EEPROM_SIZE is required for I2C / SPI EEPROM."
+#endif
+size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
 
-bool PersistentStore::access_start()  {
-  eeprom_init();
-  return true;
-}
+bool PersistentStore::access_start()  { eeprom_init(); return true; }
+bool PersistentStore::access_finish() { return true; }
 
 bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
   while (size--) {
diff --git a/Marlin/src/HAL/TEENSY31_32/eeprom.cpp b/Marlin/src/HAL/TEENSY31_32/eeprom.cpp
index 5e3c8bfcf..d4ccfe82b 100644
--- a/Marlin/src/HAL/TEENSY31_32/eeprom.cpp
+++ b/Marlin/src/HAL/TEENSY31_32/eeprom.cpp
@@ -28,8 +28,14 @@
  */
 
 #include "../shared/eeprom_api.h"
+#include <avr/eeprom.h>
 
-bool PersistentStore::access_start() { return true; }
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE size_t(E2END + 1)
+#endif
+size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
+
+bool PersistentStore::access_start()  { return true; }
 bool PersistentStore::access_finish() { return true; }
 
 bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
diff --git a/Marlin/src/HAL/TEENSY35_36/eeprom.cpp b/Marlin/src/HAL/TEENSY35_36/eeprom.cpp
index 992674551..d7cc8654b 100644
--- a/Marlin/src/HAL/TEENSY35_36/eeprom.cpp
+++ b/Marlin/src/HAL/TEENSY35_36/eeprom.cpp
@@ -34,7 +34,11 @@
 #include "../shared/eeprom_api.h"
 #include <avr/eeprom.h>
 
-size_t PersistentStore::capacity()    { return E2END + 1; }
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE size_t(E2END + 1)
+#endif
+size_t PersistentStore::capacity() { return MARLIN_EEPROM_SIZE; }
+
 bool PersistentStore::access_start()  { return true; }
 bool PersistentStore::access_finish() { return true; }
 
diff --git a/Marlin/src/module/configuration_store.cpp b/Marlin/src/module/configuration_store.cpp
index 2ebff1f03..d86016db6 100644
--- a/Marlin/src/module/configuration_store.cpp
+++ b/Marlin/src/module/configuration_store.cpp
@@ -389,7 +389,7 @@ typedef struct SettingsDataStruct {
 
 } SettingsData;
 
-//static_assert(sizeof(SettingsData) <= E2END + 1, "EEPROM too small to contain SettingsData!");
+//static_assert(sizeof(SettingsData) <= MARLIN_EEPROM_SIZE, "EEPROM too small to contain SettingsData!");
 
 MarlinSettings settings;
 
diff --git a/Marlin/src/pins/linux/pins_RAMPS_LINUX.h b/Marlin/src/pins/linux/pins_RAMPS_LINUX.h
index 27d9bc11c..11699375c 100644
--- a/Marlin/src/pins/linux/pins_RAMPS_LINUX.h
+++ b/Marlin/src/pins/linux/pins_RAMPS_LINUX.h
@@ -49,7 +49,9 @@
   #define BOARD_INFO_NAME "RAMPS 1.4"
 #endif
 
-#define E2END 0xFFF                               // 4KB
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE 0x1000               // 4KB
+#endif
 
 #define IS_RAMPS_EFB
 
diff --git a/Marlin/src/pins/sam/pins_RADDS.h b/Marlin/src/pins/sam/pins_RADDS.h
index 3bc52e938..0e67a7757 100644
--- a/Marlin/src/pins/sam/pins_RADDS.h
+++ b/Marlin/src/pins/sam/pins_RADDS.h
@@ -206,7 +206,7 @@
 #endif
 
 #define I2C_EEPROM
-#define E2END 0x1FFF                              // 8KB
+#define MARLIN_EEPROM_SIZE 0x2000                 // 8KB
 
 //
 // M3/M4/M5 - Spindle/Laser Control
diff --git a/Marlin/src/pins/sam/pins_RAMPS_FD_V2.h b/Marlin/src/pins/sam/pins_RAMPS_FD_V2.h
index 6e7d05506..9dbae7773 100644
--- a/Marlin/src/pins/sam/pins_RAMPS_FD_V2.h
+++ b/Marlin/src/pins/sam/pins_RAMPS_FD_V2.h
@@ -41,7 +41,7 @@
 #undef INVERTED_FAN_PINS
 
 #define I2C_EEPROM
-#define E2END 0xFFFF // 64K in a 24C512
+#define MARLIN_EEPROM_SIZE 0x10000 // 64K in a 24C512
 
 #ifndef PS_ON_PIN
   #define PS_ON_PIN        12
diff --git a/Marlin/src/pins/sam/pins_RAMPS_SMART.h b/Marlin/src/pins/sam/pins_RAMPS_SMART.h
index d82c69b25..bcd3f288e 100644
--- a/Marlin/src/pins/sam/pins_RAMPS_SMART.h
+++ b/Marlin/src/pins/sam/pins_RAMPS_SMART.h
@@ -70,7 +70,7 @@
 
 // I2C EEPROM with 4K of space
 #define I2C_EEPROM
-#define E2END 0xFFF
+#define MARLIN_EEPROM_SIZE 0x1000
 
 #define RESET_PIN                             42  // Resets the board if the jumper is attached
 
diff --git a/Marlin/src/pins/sam/pins_RURAMPS4D_11.h b/Marlin/src/pins/sam/pins_RURAMPS4D_11.h
index 7b844b5be..71596087d 100644
--- a/Marlin/src/pins/sam/pins_RURAMPS4D_11.h
+++ b/Marlin/src/pins/sam/pins_RURAMPS4D_11.h
@@ -186,7 +186,7 @@
 //
 // EEPROM
 //
-#define E2END 0x7FFF                              // 32Kb (24lc256)
+#define MARLIN_EEPROM_SIZE 0x8000                 // 32Kb (24lc256)
 #define I2C_EEPROM                                // EEPROM on I2C-0
 //#define EEPROM_SD                               // EEPROM on SDCARD
 //#define SPI_EEPROM                              // EEPROM on SPI-0
diff --git a/Marlin/src/pins/sam/pins_RURAMPS4D_13.h b/Marlin/src/pins/sam/pins_RURAMPS4D_13.h
index 0d06b1493..434223a2a 100644
--- a/Marlin/src/pins/sam/pins_RURAMPS4D_13.h
+++ b/Marlin/src/pins/sam/pins_RURAMPS4D_13.h
@@ -172,7 +172,7 @@
 //
 // EEPROM
 //
-#define E2END 0x7FFF                              // 32Kb (24lc256)
+#define MARLIN_EEPROM_SIZE 0x8000                 // 32Kb (24lc256)
 #define I2C_EEPROM                                // EEPROM on I2C-0
 //#define EEPROM_SD                               // EEPROM on SDCARD
 //#define SPI_EEPROM                              // EEPROM on SPI-0
diff --git a/Marlin/src/pins/samd/pins_RAMPS_144.h b/Marlin/src/pins/samd/pins_RAMPS_144.h
index 54363713e..566a72655 100644
--- a/Marlin/src/pins/samd/pins_RAMPS_144.h
+++ b/Marlin/src/pins/samd/pins_RAMPS_144.h
@@ -46,7 +46,7 @@
 //
 //#define QSPI_EEPROM                             // Use AGCM4 onboard QSPI EEPROM (Uses 4K of RAM)
 #define I2C_EEPROM                                // EEPROM on I2C-0
-#define E2END 0x7FFF                              // 32K (24lc256)
+#define MARLIN_EEPROM_SIZE 0x8000                 // 32K (24lc256)
 
 //
 // Limit Switches
diff --git a/Marlin/src/pins/stm32f1/pins_BTT_SKR_E3_DIP.h b/Marlin/src/pins/stm32f1/pins_BTT_SKR_E3_DIP.h
index 7dbd62acc..01dd6a7e9 100644
--- a/Marlin/src/pins/stm32f1/pins_BTT_SKR_E3_DIP.h
+++ b/Marlin/src/pins/stm32f1/pins_BTT_SKR_E3_DIP.h
@@ -37,8 +37,7 @@
   #define FLASH_EEPROM_EMULATION
   #define EEPROM_PAGE_SIZE     (0x800U) // 2KB
   #define EEPROM_START_ADDRESS (0x8000000UL + (STM32_FLASH_SIZE) * 1024UL - (EEPROM_PAGE_SIZE) * 2UL)
-  #undef E2END
-  #define E2END                (EEPROM_PAGE_SIZE - 1) // 2KB
+  #define MARLIN_EEPROM_SIZE    EEPROM_PAGE_SIZE  // 2KB
 #endif
 
 //
@@ -172,7 +171,6 @@
  *                 EXP1
  */
 
-
 #if HAS_SPI_LCD
 
   #if ENABLED(CR10_STOCKDISPLAY)
@@ -276,7 +274,7 @@
 //
 
 #ifndef SDCARD_CONNECTION
-  #define SDCARD_CONNECTION                 ONBOARD
+  #define SDCARD_CONNECTION              ONBOARD
 #endif
 
 #if SD_CONNECTION_IS(ONBOARD)
diff --git a/Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_E3.h b/Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_E3.h
index 30963b987..4a435d674 100644
--- a/Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_E3.h
+++ b/Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_E3.h
@@ -35,8 +35,7 @@
   #define FLASH_EEPROM_EMULATION
   #define EEPROM_PAGE_SIZE     (0x800U) // 2KB
   #define EEPROM_START_ADDRESS (0x8000000UL + (STM32_FLASH_SIZE) * 1024UL - (EEPROM_PAGE_SIZE) * 2UL)
-  #undef E2END
-  #define E2END                (EEPROM_PAGE_SIZE - 1) // 2KB
+  #define MARLIN_EEPROM_SIZE    EEPROM_PAGE_SIZE  // 2KB
 #endif
 
 //
diff --git a/Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_V1_1.h b/Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_V1_1.h
index 6d42b8395..cd0ff58a2 100644
--- a/Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_V1_1.h
+++ b/Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_V1_1.h
@@ -37,7 +37,7 @@
   #define FLASH_EEPROM_EMULATION
   #define EEPROM_PAGE_SIZE     (0x800U) // 2KB
   #define EEPROM_START_ADDRESS (0x8000000UL + (STM32_FLASH_SIZE) * 1024UL - (EEPROM_PAGE_SIZE) * 2UL)
-  #define E2END                (EEPROM_PAGE_SIZE - 1)
+  #define MARLIN_EEPROM_SIZE    EEPROM_PAGE_SIZE  // 2KB
 #endif
 
 //
diff --git a/Marlin/src/pins/stm32f1/pins_FYSETC_AIO_II.h b/Marlin/src/pins/stm32f1/pins_FYSETC_AIO_II.h
index b40306e22..187aec763 100644
--- a/Marlin/src/pins/stm32f1/pins_FYSETC_AIO_II.h
+++ b/Marlin/src/pins/stm32f1/pins_FYSETC_AIO_II.h
@@ -42,8 +42,7 @@
   #define FLASH_EEPROM_EMULATION
   #define EEPROM_PAGE_SIZE     (0x800U) // 2KB
   #define EEPROM_START_ADDRESS (0x8000000UL + (STM32_FLASH_SIZE) * 1024UL - (EEPROM_PAGE_SIZE) * 2UL)
-  #undef E2END
-  #define E2END                (EEPROM_PAGE_SIZE - 1) // 2KB
+  #define MARLIN_EEPROM_SIZE    EEPROM_PAGE_SIZE  // 2KB
 #endif
 
 //
diff --git a/Marlin/src/pins/stm32f1/pins_FYSETC_CHEETAH.h b/Marlin/src/pins/stm32f1/pins_FYSETC_CHEETAH.h
index 52444008b..e45059eab 100644
--- a/Marlin/src/pins/stm32f1/pins_FYSETC_CHEETAH.h
+++ b/Marlin/src/pins/stm32f1/pins_FYSETC_CHEETAH.h
@@ -40,8 +40,7 @@
   #define FLASH_EEPROM_EMULATION
   #define EEPROM_PAGE_SIZE     (0x800U) // 2KB
   #define EEPROM_START_ADDRESS (0x8000000UL + (STM32_FLASH_SIZE) * 1024UL - (EEPROM_PAGE_SIZE) * 2UL)
-  #undef E2END
-  #define E2END                (EEPROM_PAGE_SIZE - 1) // 2KB
+  #define MARLIN_EEPROM_SIZE    EEPROM_PAGE_SIZE  // 2KB
 #endif
 
 //
diff --git a/Marlin/src/pins/stm32f1/pins_GTM32_MINI.h b/Marlin/src/pins/stm32f1/pins_GTM32_MINI.h
index 908a10034..e7e71977c 100644
--- a/Marlin/src/pins/stm32f1/pins_GTM32_MINI.h
+++ b/Marlin/src/pins/stm32f1/pins_GTM32_MINI.h
@@ -54,7 +54,7 @@
 // Enable EEPROM Emulation for this board as it doesn't have EEPROM
 #if EITHER(NO_EEPROM_SELECTED, FLASH_EEPROM_EMULATION)
   #define FLASH_EEPROM_EMULATION
-  #define E2END 0xFFF                             // 4KB
+  #define MARLIN_EEPROM_SIZE 0x1000               // 4KB
 #endif
 
 //
diff --git a/Marlin/src/pins/stm32f1/pins_GTM32_MINI_A30.h b/Marlin/src/pins/stm32f1/pins_GTM32_MINI_A30.h
index ca1c2894c..947bbe55c 100644
--- a/Marlin/src/pins/stm32f1/pins_GTM32_MINI_A30.h
+++ b/Marlin/src/pins/stm32f1/pins_GTM32_MINI_A30.h
@@ -54,7 +54,7 @@
 // Enable EEPROM Emulation for this board as it doesn't have EEPROM
 #if EITHER(NO_EEPROM_SELECTED, FLASH_EEPROM_EMULATION)
   #define FLASH_EEPROM_EMULATION
-  #define E2END 0xFFF                             // 4KB
+  #define MARLIN_EEPROM_SIZE 0x1000               // 4KB
 #endif
 
 //
diff --git a/Marlin/src/pins/stm32f1/pins_GTM32_PRO_VB.h b/Marlin/src/pins/stm32f1/pins_GTM32_PRO_VB.h
index 908a10034..e7e71977c 100644
--- a/Marlin/src/pins/stm32f1/pins_GTM32_PRO_VB.h
+++ b/Marlin/src/pins/stm32f1/pins_GTM32_PRO_VB.h
@@ -54,7 +54,7 @@
 // Enable EEPROM Emulation for this board as it doesn't have EEPROM
 #if EITHER(NO_EEPROM_SELECTED, FLASH_EEPROM_EMULATION)
   #define FLASH_EEPROM_EMULATION
-  #define E2END 0xFFF                             // 4KB
+  #define MARLIN_EEPROM_SIZE 0x1000               // 4KB
 #endif
 
 //
diff --git a/Marlin/src/pins/stm32f1/pins_GTM32_REV_B.h b/Marlin/src/pins/stm32f1/pins_GTM32_REV_B.h
index 5dbffd289..ad140ce92 100644
--- a/Marlin/src/pins/stm32f1/pins_GTM32_REV_B.h
+++ b/Marlin/src/pins/stm32f1/pins_GTM32_REV_B.h
@@ -54,7 +54,7 @@
 // Enable EEPROM Emulation for this board as it doesn't have EEPROM
 #if EITHER(NO_EEPROM_SELECTED, FLASH_EEPROM_EMULATION)
   #define FLASH_EEPROM_EMULATION
-  #define E2END 0xFFF                             // 4KB
+  #define MARLIN_EEPROM_SIZE 0x1000               // 4KB
 #endif
 
 //
diff --git a/Marlin/src/pins/stm32f1/pins_JGAURORA_A5S_A1.h b/Marlin/src/pins/stm32f1/pins_JGAURORA_A5S_A1.h
index 340e40530..9ec0f2673 100644
--- a/Marlin/src/pins/stm32f1/pins_JGAURORA_A5S_A1.h
+++ b/Marlin/src/pins/stm32f1/pins_JGAURORA_A5S_A1.h
@@ -43,11 +43,11 @@
 // Enable EEPROM Emulation for this board, so that we don't overwrite factory data
 
 //#define I2C_EEPROM                              // AT24C64
-//#define E2END 0x7FFFUL                          // 64KB
+//#define MARLIN_EEPROM_SIZE 0x8000UL             // 64KB
 
 //#define FLASH_EEPROM_EMULATION
-//#define E2END 0xFFFUL                           // 4KB
-//#define E2END (EEPROM_START_ADDRESS + (EEPROM_PAGE_SIZE) * 2UL - 1UL)
+//#define MARLIN_EEPROM_SIZE 0x1000UL             // 4KB
+//#define MARLIN_EEPROM_SIZE (EEPROM_START_ADDRESS + (EEPROM_PAGE_SIZE) * 2UL)
 
 //#define EEPROM_CHITCHAT
 //#define DEBUG_EEPROM_READWRITE
diff --git a/Marlin/src/pins/stm32f1/pins_LONGER3D_LK.h b/Marlin/src/pins/stm32f1/pins_LONGER3D_LK.h
index 8f5619aa6..aea7cedce 100644
--- a/Marlin/src/pins/stm32f1/pins_LONGER3D_LK.h
+++ b/Marlin/src/pins/stm32f1/pins_LONGER3D_LK.h
@@ -152,7 +152,6 @@
   #define FLASH_EEPROM_EMULATION
 #endif
 
-#undef E2END
 #if ENABLED(SPI_EEPROM)
   // SPI1 EEPROM Winbond W25Q64 (8MB/64Mbits)
   #define SPI_CHAN_EEPROM1 1
@@ -161,12 +160,12 @@
   #define EEPROM_MISO        BOARD_SPI1_MISO_PIN  // PA6 pin 31
   #define EEPROM_MOSI        BOARD_SPI1_MOSI_PIN  // PA7 pin 32
   #define EEPROM_PAGE_SIZE 0x1000U                // 4KB (from datasheet)
-  #define E2END (16UL * (EEPROM_PAGE_SIZE) - 1UL) // Limit to 64KB for now...
+  #define MARLIN_EEPROM_SIZE 16UL * (EEPROM_PAGE_SIZE)   // Limit to 64KB for now...
 #elif ENABLED(FLASH_EEPROM_EMULATION)
   // SoC Flash (framework-arduinoststm32-maple/STM32F1/libraries/EEPROM/EEPROM.h)
   #define EEPROM_PAGE_SIZE     (0x800U) // 2KB
   #define EEPROM_START_ADDRESS (0x8000000UL + (STM32_FLASH_SIZE) * 1024UL - (EEPROM_PAGE_SIZE) * 2UL)
-  #define E2END (EEPROM_PAGE_SIZE - 1)
+  #define MARLIN_EEPROM_SIZE (EEPROM_PAGE_SIZE)
 #else
-  #define E2END (0x7FFU) // On SD, Limit to 2KB, require this amount of RAM
+  #define MARLIN_EEPROM_SIZE 0x800U               // On SD, Limit to 2KB, require this amount of RAM
 #endif
diff --git a/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_MINI.h b/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_MINI.h
index 6f3897814..c352acc17 100644
--- a/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_MINI.h
+++ b/Marlin/src/pins/stm32f1/pins_MKS_ROBIN_MINI.h
@@ -43,7 +43,7 @@
   // 2K in a AT24C16N
   #define EEPROM_PAGE_SIZE     (0x800U) // 2KB
   #define EEPROM_START_ADDRESS (0x8000000UL + (STM32_FLASH_SIZE) * 1024UL - (EEPROM_PAGE_SIZE) * 2UL)
-  #define E2END (EEPROM_PAGE_SIZE - 1)
+  #define MARLIN_EEPROM_SIZE    EEPROM_PAGE_SIZE  // 2KB
 #endif
 
 //
diff --git a/Marlin/src/pins/stm32f4/pins_ARMED.h b/Marlin/src/pins/stm32f4/pins_ARMED.h
index ddbe09c35..d98c79363 100644
--- a/Marlin/src/pins/stm32f4/pins_ARMED.h
+++ b/Marlin/src/pins/stm32f4/pins_ARMED.h
@@ -39,9 +39,7 @@
 #define DEFAULT_MACHINE_NAME BOARD_INFO_NAME
 
 #define I2C_EEPROM
-
-#undef E2END                                      // Defined in Arduino Core STM32 to be used with EEPROM emulation. This board uses a real EEPROM.
-#define E2END 0xFFF                               // 4KB
+#define MARLIN_EEPROM_SIZE 0x1000                 // 4KB
 
 //
 // Limit Switches
diff --git a/Marlin/src/pins/stm32f4/pins_BLACK_STM32F407VE.h b/Marlin/src/pins/stm32f4/pins_BLACK_STM32F407VE.h
index 1a6bd80ae..91903b588 100644
--- a/Marlin/src/pins/stm32f4/pins_BLACK_STM32F407VE.h
+++ b/Marlin/src/pins/stm32f4/pins_BLACK_STM32F407VE.h
@@ -40,8 +40,8 @@
 #define DEFAULT_MACHINE_NAME "STM32F407VET6"
 
 //#define I2C_EEPROM
-//#define E2END 0x1FFF                            // 8KB
 #define SRAM_EEPROM_EMULATION
+#define MARLIN_EEPROM_SIZE 0x2000                 // 8KB
 
 //
 // Servos
diff --git a/Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h b/Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h
index 47fcb97be..43c4d4279 100644
--- a/Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h
+++ b/Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h
@@ -33,8 +33,7 @@
 
 // Onboard I2C EEPROM
 #define I2C_EEPROM
-#undef E2END
-#define E2END 0x1FFF // EEPROM end address 24C64 (64Kb = 8KB)
+#define MARLIN_EEPROM_SIZE 0x2000                 // 8KB (24C64 ... 64Kb = 8KB)
 
 #define TP                                        // Enable to define servo and probe pins
 
diff --git a/Marlin/src/pins/stm32f4/pins_FLYF407ZG.h b/Marlin/src/pins/stm32f4/pins_FLYF407ZG.h
index 3681fde8d..2c8f0a95b 100644
--- a/Marlin/src/pins/stm32f4/pins_FLYF407ZG.h
+++ b/Marlin/src/pins/stm32f4/pins_FLYF407ZG.h
@@ -31,8 +31,7 @@
 #define BOARD_WEBSITE_URL    "github.com/FLYmaker/FLYF407ZG"
 #define DEFAULT_MACHINE_NAME BOARD_INFO_NAME
 
-#undef E2END
-#define E2END 0xFFF                               // 4KB
+#define MARLIN_EEPROM_SIZE 0x1000                 // 4KB
 
 //
 // Servos
diff --git a/Marlin/src/pins/stm32f4/pins_FYSETC_S6.h b/Marlin/src/pins/stm32f4/pins_FYSETC_S6.h
index 18a91d3ea..989521322 100644
--- a/Marlin/src/pins/stm32f4/pins_FYSETC_S6.h
+++ b/Marlin/src/pins/stm32f4/pins_FYSETC_S6.h
@@ -51,8 +51,7 @@
   // 128 kB sector allocated for EEPROM emulation.
   #define FLASH_EEPROM_LEVELING
 #elif ENABLED(I2C_EEPROM)
-  #undef E2END                                    // Defined in Arduino Core STM32 to be used with EEPROM emulation. This board uses a real EEPROM.
-  #define E2END 0xFFF                             // 4KB
+  #define MARLIN_EEPROM_SIZE 0x1000               // 4KB
 #endif
 
 //
diff --git a/Marlin/src/pins/stm32f4/pins_GENERIC_STM32F4.h b/Marlin/src/pins/stm32f4/pins_GENERIC_STM32F4.h
index 5df7ffe46..0d9356ce5 100644
--- a/Marlin/src/pins/stm32f4/pins_GENERIC_STM32F4.h
+++ b/Marlin/src/pins/stm32f4/pins_GENERIC_STM32F4.h
@@ -36,8 +36,8 @@
 
 //#define I2C_EEPROM
 
-#ifndef E2END
-  #define E2END 0xFFF                             // 4KB
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE 0x1000               // 4KB
 #endif
 
 // Ignore temp readings during development.
diff --git a/Marlin/src/pins/stm32f4/pins_RUMBA32_common.h b/Marlin/src/pins/stm32f4/pins_RUMBA32_common.h
index 19853a78f..d13733222 100644
--- a/Marlin/src/pins/stm32f4/pins_RUMBA32_common.h
+++ b/Marlin/src/pins/stm32f4/pins_RUMBA32_common.h
@@ -35,10 +35,7 @@
 #define DEFAULT_MACHINE_NAME BOARD_INFO_NAME
 
 //#define I2C_EEPROM
-#ifdef E2END
-  #undef E2END
-#endif
-#define E2END 0xFFF                               // 4KB
+#define MARLIN_EEPROM_SIZE 0x1000                 // 4KB
 
 //
 // Limit Switches
diff --git a/Marlin/src/pins/stm32f4/pins_VAKE403D.h b/Marlin/src/pins/stm32f4/pins_VAKE403D.h
index 08f8adebc..ccfc76146 100644
--- a/Marlin/src/pins/stm32f4/pins_VAKE403D.h
+++ b/Marlin/src/pins/stm32f4/pins_VAKE403D.h
@@ -31,8 +31,7 @@
 #define BOARD_INFO_NAME      "STM32F4 VAkE"
 
 //#define I2C_EEPROM
-
-#define E2END 0xFFF                               // EEPROM end address (4kB)
+#define MARLIN_EEPROM_SIZE 0x1000                 // 4KB
 
 //
 // Servos
diff --git a/Marlin/src/pins/stm32f7/pins_THE_BORG.h b/Marlin/src/pins/stm32f7/pins_THE_BORG.h
index c937c5397..ffb663821 100644
--- a/Marlin/src/pins/stm32f7/pins_THE_BORG.h
+++ b/Marlin/src/pins/stm32f7/pins_THE_BORG.h
@@ -30,8 +30,8 @@
 #define BOARD_INFO_NAME      "The-Borge"
 #define DEFAULT_MACHINE_NAME BOARD_INFO_NAME
 
-#ifndef E2END
-  #define E2END 0xFFF                             // EEPROM end address
+#ifndef MARLIN_EEPROM_SIZE
+  #define MARLIN_EEPROM_SIZE 0x1000
 #endif
 
 // Ignore temp readings during development.