Index: uspace/app/mkexfat/mkexfat.c
===================================================================
--- uspace/app/mkexfat/mkexfat.c	(revision da34d61d7eccd2945a3eebc8b57e4d22e01e27f2)
+++ uspace/app/mkexfat/mkexfat.c	(revision ff415f62a6286ff6db4f9bc53be57df202e306e0)
@@ -304,5 +304,5 @@
 
 		rc = block_write_direct(service_id,
-		    i + EBS_SECTOR_START + base, 1, ebs);
+		    i + base, 1, ebs);
 
 		if (rc != EOK)
@@ -324,4 +324,5 @@
 	/* The next sector is reserved, fill it with zeroes too */
 	vbr_checksum_update(ebs, cfg->sector_size, chksum);
+
 	rc = block_write_direct(service_id, i++ + base, 1, ebs);
 	if (rc != EOK)