diff --git a/firmware/chibios-portapack/os/various/fatfs_bindings/fatfs_diskio.c b/firmware/chibios-portapack/os/various/fatfs_bindings/fatfs_diskio.c
index 6adcdc20..7f090f16 100755
--- a/firmware/chibios-portapack/os/various/fatfs_bindings/fatfs_diskio.c
+++ b/firmware/chibios-portapack/os/various/fatfs_bindings/fatfs_diskio.c
@@ -232,7 +232,7 @@ DRESULT disk_ioctl (
         *((WORD *)buff) = MMCSD_BLOCK_SIZE;
         return RES_OK;
     case GET_BLOCK_SIZE:
-        *((DWORD *)buff) = 256; /* 512b blocks in one erase block */
+        *((DWORD *)buff) = 1; /* Unknown, TODO: implement? */
         return RES_OK;
 #if _USE_ERASE
     case CTRL_ERASE_SECTOR: