diff --git a/reactos/drivers/filesystems/ext2/src/fsctl.c b/reactos/drivers/filesystems/ext2/src/fsctl.c
index 124b73930d3..d6cb8d71176 100644
--- a/reactos/drivers/filesystems/ext2/src/fsctl.c
+++ b/reactos/drivers/filesystems/ext2/src/fsctl.c
@@ -1496,6 +1496,13 @@ Ext2MountVolume (IN PEXT2_IRP_CONTEXT IrpContext)
             _SEH2_LEAVE;
         }
 
+#ifdef __REACTOS__
+        if (DiskGeometry.MediaType == Unknown)
+        {
+            DiskGeometry.BytesPerSector = 512;
+        }
+#endif
+
         Status = IoCreateDevice(
                      MainDeviceObject->DriverObject,
                      sizeof(EXT2_VCB),