diff --git a/src/FSCommon.cpp b/src/FSCommon.cpp
index df46c19412..f9c96931af 100644
--- a/src/FSCommon.cpp
+++ b/src/FSCommon.cpp
@@ -14,13 +14,20 @@
 #ifdef HAS_SDCARD
 #include <SD.h>
 #include <SPI.h>
-
 #ifdef SDCARD_USE_SPI1
+#ifdef ARCH_ESP32
 SPIClass SPI1(HSPI);
-#define SDHandler SPI1
+#endif // ARCH_ESP32
+#ifdef ARCH_NRF52
+#define SDCARD_SPI SPI1
+#endif                 // NRF52
+#define SDHandler SPI1 // only used for esp32
 #else
-#define SDHandler SPI
-#endif
+#ifdef ARCH_NRF52
+#define SDCARD_SPI SPI
+#endif                // NRF52
+#define SDHandler SPI // only used for esp32
+#endif                // SDCARD_USE_SPI1
 
 #endif // HAS_SDCARD
 
@@ -46,7 +53,7 @@ void OSFS::writeNBytes(uint16_t address, unsigned int num, const byte *input)
         input++;
     }
 }
-#endif
+#endif // ARCH_STM32WL
 
 bool lfs_assert_failed =
     false; // Note: we use this global on all platforms, though it can only be set true on nrf52 (in our modified lfs_util.h)
@@ -356,9 +363,11 @@ void fsInit()
 void setupSDCard()
 {
 #ifdef HAS_SDCARD
+#if (defined(ARCH_ESP32) || defined(ARCH_NRF52))
+#if (defined(ARCH_ESP32))
     SDHandler.begin(SPI_SCK, SPI_MISO, SPI_MOSI);
-
-    if (!SD.begin(SDCARD_CS, SDHandler)) {
+#endif
+    if (!SD.begin(SDCARD_CS, SDHandler)) { // param SDHandler only used for esp32
         LOG_DEBUG("No SD_MMC card detected");
         return;
     }
@@ -381,6 +390,9 @@ void setupSDCard()
     uint64_t cardSize = SD.cardSize() / (1024 * 1024);
     LOG_DEBUG("SD Card Size: %lu MB", (uint32_t)cardSize);
     LOG_DEBUG("Total space: %lu MB", (uint32_t)(SD.totalBytes() / (1024 * 1024)));
+#if (defined(ARCH_ESP32)) // not implemented in arduino sd library
     LOG_DEBUG("Used space: %lu MB", (uint32_t)(SD.usedBytes() / (1024 * 1024)));
 #endif
-}
\ No newline at end of file
+#endif
+#endif
+}
diff --git a/src/memGet.cpp b/src/memGet.cpp
index 33fb94e1c0..c7078fac4d 100644
--- a/src/memGet.cpp
+++ b/src/memGet.cpp
@@ -57,7 +57,7 @@ uint32_t MemGet::getFreePsram()
 {
 #ifdef ARCH_ESP32
     return ESP.getFreePsram();
-#elif defined(HAS_SDCARD)
+#elif (defined(HAS_SDCARD) && defined(ARCH_ESP32))
     return SD.totalBytes() - SD.usedBytes();
 #elif defined(ARCH_PORTDUINO)
     return 4194252;
@@ -75,7 +75,7 @@ uint32_t MemGet::getPsramSize()
 {
 #ifdef ARCH_ESP32
     return ESP.getPsramSize();
-#elif defined(HAS_SDCARD)
+#elif (defined(HAS_SDCARD) && defined(ARCH_ESP32))
     return SD.totalBytes();
 #elif defined(ARCH_PORTDUINO)
     return 4194252;
diff --git a/src/modules/StoreForwardModule.cpp b/src/modules/StoreForwardModule.cpp
index 4a762a1c3c..928f116430 100644
--- a/src/modules/StoreForwardModule.cpp
+++ b/src/modules/StoreForwardModule.cpp
@@ -98,6 +98,7 @@ void StoreForwardModule::populatePSRAM()
 void StoreForwardModule::populateSDCard()
 {
 #if defined(HAS_SDCARD)
+#if (defined(ARCH_ESP32) || defined(ARCH_NRF52))
     if (SD.cardType() != CARD_NONE) {
         if (!SD.exists("/storeforward")) {
             LOG_INFO("Creating StoreForward directory");
@@ -109,7 +110,8 @@ void StoreForwardModule::populateSDCard()
         this->packetHistory = (PacketHistoryStruct *)malloc(sizeof(PacketHistoryStruct));
         LOG_DEBUG("numberOfPackets for packetHistory - %u", numberOfPackets);
     }
-#endif
+#endif // ARCH_ESP32 || ARCH_NRF52
+#endif // HAS_SDCARD
 }
 
 /**
@@ -166,6 +168,7 @@ uint32_t StoreForwardModule::getNumAvailablePackets(NodeNum dest, uint32_t last_
             }
         } else if (this->storageType == StorageType::ST_SDCARD) {
 #if defined(HAS_SDCARD)
+#if defined(ARCH_ESP32) || defined(ARCH_NRF52)
             auto handler = SD.open("/storeforward/" + String(i), FILE_READ);
             if (handler) {
                 handler.read((uint8_t *)&this->packetHistory[0], sizeof(PacketHistoryStruct));
@@ -178,6 +181,7 @@ uint32_t StoreForwardModule::getNumAvailablePackets(NodeNum dest, uint32_t last_
                     }
                 }
             }
+#endif
 #endif
         } else {
             LOG_ERROR("S&F: Unknown storage type");
@@ -248,6 +252,7 @@ void StoreForwardModule::historyAdd(const meshtastic_MeshPacket &mp)
     } else if (this->storageType == StorageType::ST_SDCARD) {
 // Save to SDCARD
 #if defined(HAS_SDCARD)
+#if defined(ARCH_ESP32) || defined(ARCH_NRF52)
         this->packetHistory[0].time = getTime();
         this->packetHistory[0].to = mp.to;
         this->packetHistory[0].channel = mp.channel;
@@ -260,6 +265,7 @@ void StoreForwardModule::historyAdd(const meshtastic_MeshPacket &mp)
         auto handler = SD.open("/storeforward/" + String(this->packetHistoryTotalCount), FILE_WRITE);
         handler.write((uint8_t *)&this->packetHistory, sizeof(PacketHistoryStruct));
         handler.close();
+#endif
 #endif
     } else {
         LOG_ERROR("S&F: Unknown storage type");
@@ -346,6 +352,7 @@ meshtastic_MeshPacket *StoreForwardModule::preparePayload(NodeNum dest, uint32_t
             }
         } else if (this->storageType == StorageType::ST_SDCARD) {
 #if defined(HAS_SDCARD)
+#if defined(ARCH_ESP32) || defined(ARCH_NRF52)
             auto handler = SD.open("/storeforward/" + String(i), FILE_READ);
             if (handler) {
                 handler.read((uint8_t *)&this->packetHistory[0], sizeof(PacketHistoryStruct));
@@ -389,6 +396,7 @@ meshtastic_MeshPacket *StoreForwardModule::preparePayload(NodeNum dest, uint32_t
                     }
                 }
             }
+#endif
 #endif
         } else {
             LOG_ERROR("S&F: Unknown storage type");
diff --git a/src/xmodem.h b/src/xmodem.h
index 4cfcb43e18..ae1cca7cb7 100644
--- a/src/xmodem.h
+++ b/src/xmodem.h
@@ -62,7 +62,7 @@ class XModemAdapter
     uint16_t packetno = 0;
 
 #if defined(ARCH_NRF52) || defined(ARCH_STM32WL)
-    File file = File(FSCom);
+    Adafruit_LittleFS_Namespace::File file = Adafruit_LittleFS_Namespace::File(FSCom);
 #else
     File file;
 #endif
diff --git a/variants/rak4631/platformio.ini b/variants/rak4631/platformio.ini
index ced93df66f..c423264fee 100644
--- a/variants/rak4631/platformio.ini
+++ b/variants/rak4631/platformio.ini
@@ -20,6 +20,7 @@ lib_deps =
   https://github.com/RAKWireless/RAK13800-W5100S.git#1.0.2
   rakwireless/RAKwireless NCP5623 RGB LED library@^1.0.2
   https://github.com/RAKWireless/RAK12034-BMX160.git#dcead07ffa267d3c906e9ca4a1330ab989e957e2
+  https://github.com/Woutvstk/arduino_SD.git#909c2a4a14f5b053bb69958709f0c874aa358c38 ;library to acces SD card
 
 ; If not set we will default to uploading over serial (first it forces bootloader entry by talking 1200bps to cdcacm)
 ; Note: as of 6/2013 the serial/bootloader based programming takes approximately 30 seconds
diff --git a/variants/rak4631/variant.h b/variants/rak4631/variant.h
index bc55413368..f5a60fdeed 100644
--- a/variants/rak4631/variant.h
+++ b/variants/rak4631/variant.h
@@ -122,6 +122,19 @@ static const uint8_t MOSI = PIN_SPI_MOSI;
 static const uint8_t MISO = PIN_SPI_MISO;
 static const uint8_t SCK = PIN_SPI_SCK;
 
+// SD card SPI pin definitions
+
+#define HAS_SDCARD 1
+#define SDCARD_USE_SPI1 1
+
+#ifdef SDCARD_USE_SPI1
+#define SDCARD_SPI SPI1
+#endif
+#define SPI_MOSI PIN_SPI1_MOSI
+#define SPI_SCK PIN_SPI1_SCK
+#define SPI_MISO PIN_SPI1_MISO
+#define SDCARD_CS (26)
+
 /*
  * eink display pins
  */