diff --git a/arm9/source/fatfs/diskio.c b/arm9/source/fatfs/diskio.c
index 3d245db..7382eef 100644
--- a/arm9/source/fatfs/diskio.c
+++ b/arm9/source/fatfs/diskio.c
@@ -171,18 +171,18 @@ DRESULT disk_read (
     if (type == TYPE_NONE) {
         return RES_PARERR;
     } else if (type == TYPE_SDCARD) {
-        if (sdmmc_sdcard_readsectors(sector, count, buff))
-            return RES_PARERR;
+        if (sdmmc_sdcard_readsectors(sector, count, buff) != 0)
+            return RES_ERROR;
     } else if (type == TYPE_IMAGE) {
-        if (ReadImageSectors(buff, sector, count))
-            return RES_PARERR;
+        if (ReadImageSectors(buff, sector, count) != 0)
+            return RES_ERROR;
     } else if (type == TYPE_RAMDRV) {
-        if (ReadRamDriveSectors(buff, sector, count))
-            return RES_PARERR;
+        if (ReadRamDriveSectors(buff, sector, count) != 0)
+            return RES_ERROR;
     } else {
         FATpartition* fat_info = PART_INFO(pdrv);
-        if (ReadNandSectors(buff, fat_info->offset + sector, count, fat_info->keyslot, type))
-            return RES_PARERR;
+        if (ReadNandSectors(buff, fat_info->offset + sector, count, fat_info->keyslot, type) != 0)
+            return RES_ERROR;
     }
 
 	return RES_OK;
@@ -208,18 +208,18 @@ DRESULT disk_write (
     if (type == TYPE_NONE) {
         return RES_PARERR;
     } else if (type == TYPE_SDCARD) {
-        if (sdmmc_sdcard_writesectors(sector, count, (BYTE *)buff))
-            return RES_PARERR;
+        if (sdmmc_sdcard_writesectors(sector, count, (BYTE *)buff) != 0)
+            return RES_ERROR;
     } else if (type == TYPE_IMAGE) {
-        if (WriteImageSectors(buff, sector, count))
-            return RES_PARERR;
+        if (WriteImageSectors(buff, sector, count) != 0)
+            return RES_ERROR;
     } else if (type == TYPE_RAMDRV) {
-        if (WriteRamDriveSectors(buff, sector, count))
-            return RES_PARERR;
+        if (WriteRamDriveSectors(buff, sector, count) != 0)
+            return RES_ERROR;
     } else {
         FATpartition* fat_info = PART_INFO(pdrv);
-        if (WriteNandSectors(buff, fat_info->offset + sector, count, fat_info->keyslot, type))
-            return RES_PARERR; // unstubbed!
+        if (WriteNandSectors(buff, fat_info->offset + sector, count, fat_info->keyslot, type) != 0)
+            return RES_ERROR; // unstubbed!
     }
 
 	return RES_OK;