diff --git a/Marlin/src/HAL/DUE/usb/sd_mmc_spi_mem.cpp b/Marlin/src/HAL/DUE/usb/sd_mmc_spi_mem.cpp
index a7789c5a645..cf6739c5bda 100644
--- a/Marlin/src/HAL/DUE/usb/sd_mmc_spi_mem.cpp
+++ b/Marlin/src/HAL/DUE/usb/sd_mmc_spi_mem.cpp
@@ -19,9 +19,7 @@ void sd_mmc_spi_mem_init() {
 }
 
 inline bool media_ready() {
-  return DISABLED(DISABLE_DUE_SD_MMC)
-          && IS_SD_MOUNTED() && IS_SD_INSERTED()
-          && !IS_SD_FILE_OPEN() && !IS_SD_PRINTING();
+  return IS_SD_MOUNTED() && IS_SD_INSERTED() && !IS_SD_FILE_OPEN() && !IS_SD_PRINTING();
 }
 
 bool sd_mmc_spi_unload(bool) { return true; }
@@ -31,6 +29,9 @@ bool sd_mmc_spi_wr_protect() { return false; }
 bool sd_mmc_spi_removal() { return !media_ready(); }
 
 Ctrl_status sd_mmc_spi_test_unit_ready() {
+  #ifdef DISABLE_DUE_SD_MMC
+    return CTRL_NO_PRESENT;
+  #endif
   if (sd_mmc_spi_removal()) return CTRL_NO_PRESENT;
   return CTRL_GOOD;
 }
@@ -57,6 +58,9 @@ uint8_t sector_buf[SD_MMC_BLOCK_SIZE];
 // #define DEBUG_MMC
 
 Ctrl_status sd_mmc_spi_usb_read_10(uint32_t addr, uint16_t nb_sector) {
+  #ifdef DISABLE_DUE_SD_MMC
+    return CTRL_NO_PRESENT;
+  #endif
   if (sd_mmc_spi_removal()) return CTRL_NO_PRESENT;
 
   #ifdef DEBUG_MMC
@@ -93,6 +97,9 @@ Ctrl_status sd_mmc_spi_usb_read_10(uint32_t addr, uint16_t nb_sector) {
 }
 
 Ctrl_status sd_mmc_spi_usb_write_10(uint32_t addr, uint16_t nb_sector) {
+  #ifdef DISABLE_DUE_SD_MMC
+    return CTRL_NO_PRESENT;
+  #endif
   if (sd_mmc_spi_removal()) return CTRL_NO_PRESENT;
 
   #ifdef DEBUG_MMC
diff --git a/Marlin/src/feature/easythreed_ui.cpp b/Marlin/src/feature/easythreed_ui.cpp
index 39248bfc7d7..9617c62eb94 100644
--- a/Marlin/src/feature/easythreed_ui.cpp
+++ b/Marlin/src/feature/easythreed_ui.cpp
@@ -189,7 +189,7 @@ void EasythreedUI::printButton() {
             blink_interval_ms = LED_BLINK_2;                        // Blink the indicator LED at 1 second intervals
             print_key_flag = PF_PAUSE;                              // The "Print" button now pauses the print
             card.mount();                                           // Force SD card to mount - now!
-            if (!card.isMounted) {                                  // Failed to mount?
+            if (!card.isMounted()) {                                // Failed to mount?
               blink_interval_ms = LED_OFF;                          // Turn off LED
               print_key_flag = PF_START;
               return;                                               // Bail out