diff --git a/fusee/fusee-secondary/src/lib/fatfs/diskio.c b/fusee/fusee-secondary/src/lib/fatfs/diskio.c
index e81d44c47..98d0e7e2d 100644
--- a/fusee/fusee-secondary/src/lib/fatfs/diskio.c
+++ b/fusee/fusee-secondary/src/lib/fatfs/diskio.c
@@ -116,6 +116,13 @@ DRESULT disk_ioctl (
 	void *buff		/* Buffer to send/receive control data */
 )
 {
-	return 0;
+	device_partition_t *devpart = g_volume_to_devparts[pdrv];
+	switch (cmd) {
+			case GET_SECTOR_SIZE:
+				*(WORD *)buff = devpart != NULL ? (WORD)devpart->sector_size : 512;
+				return 0;
+			default:
+				return 0;
+	}
 }
 
diff --git a/fusee/fusee-secondary/src/lib/fatfs/ffconf.h b/fusee/fusee-secondary/src/lib/fatfs/ffconf.h
index c7d15edc2..78a3133ce 100644
--- a/fusee/fusee-secondary/src/lib/fatfs/ffconf.h
+++ b/fusee/fusee-secondary/src/lib/fatfs/ffconf.h
@@ -191,7 +191,7 @@
 
 
 #define FF_MIN_SS		512
-#define FF_MAX_SS		512
+#define FF_MAX_SS		4096
 /* This set of options configures the range of sector size to be supported. (512,
 /  1024, 2048 or 4096) Always set both 512 for most systems, generic memory card and
 /  harddisk. But a larger value may be required for on-board flash memory and some