Index: uspace/srv/fs/minixfs/mfs_balloc.c
===================================================================
--- uspace/srv/fs/minixfs/mfs_balloc.c	(revision 2527b1d5da0aa57bb2d42f4eb7fd8a180c6e9ae5)
+++ uspace/srv/fs/minixfs/mfs_balloc.c	(revision efa5fa151d401751b6188ec998da11182b096c92)
@@ -52,4 +52,5 @@
 
 	if (bid == BMAP_ZONE) {
+		idx -= sbi->firstdatazone;
 		start_block = 2 + sbi->ibmap_blocks;
 		if (idx > sbi->nzones) {
@@ -151,4 +152,8 @@
 
 		*search = *idx;
+
+		if (bid == BMAP_ZONE)
+			*idx += sbi->firstdatazone;
+
 		b->dirty = true;
 		r = block_put(b);