diff --git a/ports/stm32/spibdev.c b/ports/stm32/spibdev.c
index 4481a7a709..3eadb995d6 100644
--- a/ports/stm32/spibdev.c
+++ b/ports/stm32/spibdev.c
@@ -105,26 +105,26 @@ void spi_bdev_flush(void) {
     }
 }
 
-bool spi_bdev_readblock(uint8_t *dest, uint32_t block) {
+int spi_bdev_readblocks(uint8_t *dest, uint32_t block_num, uint32_t num_blocks) {
     // we must disable USB irqs to prevent MSC contention with SPI flash
     uint32_t basepri = raise_irq_pri(IRQ_PRI_OTG_FS);
-    mp_spiflash_read(&spiflash, block * FLASH_BLOCK_SIZE, FLASH_BLOCK_SIZE, dest);
+    mp_spiflash_read(&spiflash, block_num * FLASH_BLOCK_SIZE, num_blocks * FLASH_BLOCK_SIZE, dest);
     restore_irq_pri(basepri);
 
-    return true;
+    return 0;
 }
 
-bool spi_bdev_writeblock(const uint8_t *src, uint32_t block) {
+int spi_bdev_writeblocks(const uint8_t *src, uint32_t block_num, uint32_t num_blocks) {
     // we must disable USB irqs to prevent MSC contention with SPI flash
     uint32_t basepri = raise_irq_pri(IRQ_PRI_OTG_FS);
-    int ret = mp_spiflash_write(&spiflash, block * FLASH_BLOCK_SIZE, FLASH_BLOCK_SIZE, src);
+    int ret = mp_spiflash_write(&spiflash, block_num * FLASH_BLOCK_SIZE, num_blocks * FLASH_BLOCK_SIZE, src);
     if (spiflash.flags & 1) {
         led_state(PYB_LED_RED, 1); // indicate a dirty cache with LED on
         flash_tick_counter_last_write = HAL_GetTick();
     }
     restore_irq_pri(basepri);
 
-    return ret == 0;
+    return ret;
 }
 
 #endif // defined(MICROPY_HW_SPIFLASH_SIZE_BITS)
diff --git a/ports/stm32/storage.c b/ports/stm32/storage.c
index 0b6f2db621..46bd4fdc76 100644
--- a/ports/stm32/storage.c
+++ b/ports/stm32/storage.c
@@ -41,8 +41,8 @@
 #define BDEV_INIT spi_bdev_init
 #define BDEV_IRQ_HANDLER spi_bdev_irq_handler
 #define BDEV_FLUSH spi_bdev_flush
-#define BDEV_READBLOCK spi_bdev_readblock
-#define BDEV_WRITEBLOCK spi_bdev_writeblock
+#define BDEV_READBLOCKS spi_bdev_readblocks
+#define BDEV_WRITEBLOCKS spi_bdev_writeblocks
 
 #else
 
diff --git a/ports/stm32/storage.h b/ports/stm32/storage.h
index 2497633896..8b3cedb127 100644
--- a/ports/stm32/storage.h
+++ b/ports/stm32/storage.h
@@ -53,8 +53,8 @@ bool flash_bdev_writeblock(const uint8_t *src, uint32_t block);
 void spi_bdev_init(void);
 void spi_bdev_irq_handler(void);
 void spi_bdev_flush(void);
-bool spi_bdev_readblock(uint8_t *dest, uint32_t block);
-bool spi_bdev_writeblock(const uint8_t *src, uint32_t block);
+int spi_bdev_readblocks(uint8_t *dest, uint32_t block_num, uint32_t num_blocks);
+int spi_bdev_writeblocks(const uint8_t *src, uint32_t block_num, uint32_t num_blocks);
 
 extern const struct _mp_obj_type_t pyb_flash_type;