=== modified file 'zsh-functions/confz_fs_init'
--- zsh-functions/confz_fs_init	2015-04-20 23:48:37 +0000
+++ zsh-functions/confz_fs_init	2015-04-20 23:44:34 +0000
@@ -70,7 +70,9 @@
 # embed file in MBR
 confz_mbr_code_check() {
 	checkvars device from
-	if dd if=$vars[device] bs=440 count=1 | cmp -s - $vars[from]; then
+	local out
+	out=$( cmp -n 440 $vars[device] $vars[from] ) || die "$0: cmp failed"
+	if [[ -z $out ]]; then
 		return 0
 	else
 		fail_reason=$out