diff --git a/Marlin/cardreader.cpp b/Marlin/cardreader.cpp
index f6b55f9301..5b69174da5 100644
--- a/Marlin/cardreader.cpp
+++ b/Marlin/cardreader.cpp
@@ -195,8 +195,10 @@ void CardReader::initsd() {
   cardOK = false;
   if (root.isOpen()) root.close();
 
-  #if ENABLED(SDEXTRASLOW)
+  #if ENABLED(SDULTRASLOW)
     #define SPI_SPEED SPI_SIXTEENTH_SPEED
+  #elif ENABLED(SDEXTRASLOW)
+    #define SPI_SPEED SPI_QUARTER_SPEED
   #elif ENABLED(SDSLOW)
     #define SPI_SPEED SPI_HALF_SPEED
   #else
diff --git a/Marlin/example_configurations/Felix/Configuration.h b/Marlin/example_configurations/Felix/Configuration.h
index f946d35c0a..ba67118989 100644
--- a/Marlin/example_configurations/Felix/Configuration.h
+++ b/Marlin/example_configurations/Felix/Configuration.h
@@ -651,6 +651,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Changed behaviour! If you need SDSUPPORT uncomment it!
 //#define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/Felix/Configuration_DUAL.h b/Marlin/example_configurations/Felix/Configuration_DUAL.h
index bd7b8eed4e..1d21b37531 100644
--- a/Marlin/example_configurations/Felix/Configuration_DUAL.h
+++ b/Marlin/example_configurations/Felix/Configuration_DUAL.h
@@ -620,6 +620,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Changed behaviour! If you need SDSUPPORT uncomment it!
 //#define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/Hephestos/Configuration.h b/Marlin/example_configurations/Hephestos/Configuration.h
index 9fe3715f7f..4e7bc9c713 100644
--- a/Marlin/example_configurations/Hephestos/Configuration.h
+++ b/Marlin/example_configurations/Hephestos/Configuration.h
@@ -660,6 +660,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 #define SDSUPPORT // Enable SD Card Support in Hardware Console
 //#define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/K8200/Configuration.h b/Marlin/example_configurations/K8200/Configuration.h
index 426d8e9b68..220532af31 100644
--- a/Marlin/example_configurations/K8200/Configuration.h
+++ b/Marlin/example_configurations/K8200/Configuration.h
@@ -656,6 +656,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Changed behaviour! If you need SDSUPPORT uncomment it!
 //#define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h b/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
index e03debc8fc..9b628d9ff1 100644
--- a/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
+++ b/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
@@ -668,6 +668,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define SDSUPPORT // Enable SD Card Support in Hardware Console
 //#define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 #define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/RigidBot/Configuration.h b/Marlin/example_configurations/RigidBot/Configuration.h
index e0c956e17f..ca1df7fc3e 100644
--- a/Marlin/example_configurations/RigidBot/Configuration.h
+++ b/Marlin/example_configurations/RigidBot/Configuration.h
@@ -659,7 +659,8 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define SDSUPPORT // Enable SD Card Support in Hardware Console
 // Changed behaviour! If you need SDSUPPORT uncomment it!
 //#define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
-#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/SCARA/Configuration.h b/Marlin/example_configurations/SCARA/Configuration.h
index 05c315917f..881c607656 100644
--- a/Marlin/example_configurations/SCARA/Configuration.h
+++ b/Marlin/example_configurations/SCARA/Configuration.h
@@ -676,6 +676,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Changed behaviour! If you need SDSUPPORT uncomment it!
 //#define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/TAZ4/Configuration.h b/Marlin/example_configurations/TAZ4/Configuration.h
index 484d32da14..aa839b8b95 100644
--- a/Marlin/example_configurations/TAZ4/Configuration.h
+++ b/Marlin/example_configurations/TAZ4/Configuration.h
@@ -687,6 +687,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Changed behaviour! If you need SDSUPPORT uncomment it!
 //#define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 #define ENCODER_PULSES_PER_STEP 2 // Increase if you have a high resolution encoder
 #define ENCODER_STEPS_PER_MENU_ITEM 1 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/WITBOX/Configuration.h b/Marlin/example_configurations/WITBOX/Configuration.h
index 2d235e59e7..5443f51ee5 100644
--- a/Marlin/example_configurations/WITBOX/Configuration.h
+++ b/Marlin/example_configurations/WITBOX/Configuration.h
@@ -659,6 +659,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 #define SDSUPPORT // Enable SD Card Support in Hardware Console
 //#define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/adafruit/ST7565/Configuration.h b/Marlin/example_configurations/adafruit/ST7565/Configuration.h
index 442ee1d7b4..4032fbdde0 100644
--- a/Marlin/example_configurations/adafruit/ST7565/Configuration.h
+++ b/Marlin/example_configurations/adafruit/ST7565/Configuration.h
@@ -668,6 +668,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define SDSUPPORT // Enable SD Card Support in Hardware Console
 #define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/delta/biv2.5/Configuration.h b/Marlin/example_configurations/delta/biv2.5/Configuration.h
index faa271dab5..2289d3d0d4 100644
--- a/Marlin/example_configurations/delta/biv2.5/Configuration.h
+++ b/Marlin/example_configurations/delta/biv2.5/Configuration.h
@@ -790,6 +790,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 // Changed behaviour! If you need SDSUPPORT uncomment it!
 //#define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/delta/generic/Configuration.h b/Marlin/example_configurations/delta/generic/Configuration.h
index f488163333..11e263c81b 100644
--- a/Marlin/example_configurations/delta/generic/Configuration.h
+++ b/Marlin/example_configurations/delta/generic/Configuration.h
@@ -791,6 +791,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 // Changed behaviour! If you need SDSUPPORT uncomment it!
 //#define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/delta/kossel_mini/Configuration.h b/Marlin/example_configurations/delta/kossel_mini/Configuration.h
index 3a94ce2f51..fe458ed0f7 100644
--- a/Marlin/example_configurations/delta/kossel_mini/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_mini/Configuration.h
@@ -795,6 +795,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Changed behaviour! If you need SDSUPPORT uncomment it!
 //#define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/delta/kossel_pro/Configuration.h b/Marlin/example_configurations/delta/kossel_pro/Configuration.h
index 592471dd25..e3510fb741 100644
--- a/Marlin/example_configurations/delta/kossel_pro/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_pro/Configuration.h
@@ -785,6 +785,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define SDSUPPORT // Enable SD Card Support in Hardware Console
 //#define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/makibox/Configuration.h b/Marlin/example_configurations/makibox/Configuration.h
index 2f8fd73ba8..c16da81014 100644
--- a/Marlin/example_configurations/makibox/Configuration.h
+++ b/Marlin/example_configurations/makibox/Configuration.h
@@ -670,6 +670,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define SDSUPPORT // Enable SD Card Support in Hardware Console
 #define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
diff --git a/Marlin/example_configurations/tvrrug/Round2/Configuration.h b/Marlin/example_configurations/tvrrug/Round2/Configuration.h
index 9a6aac98d3..a74d2e51bc 100644
--- a/Marlin/example_configurations/tvrrug/Round2/Configuration.h
+++ b/Marlin/example_configurations/tvrrug/Round2/Configuration.h
@@ -663,6 +663,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 // Changed behaviour! If you need SDSUPPORT uncomment it!
 //#define SDSLOW // Use slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SDEXTRASLOW // Use even slower SD transfer mode (not normally needed - uncomment if you're getting volume init error)
+//#define SDULTRASLOW // Use slowest SD transfer mode (not normally needed - uncomment if you're getting volume init error)
 //#define SD_CHECK_AND_RETRY // Use CRC checks and retries on the SD communication
 //#define ENCODER_PULSES_PER_STEP 1 // Increase if you have a high resolution encoder
 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking