if ! cmp $md5sum $img.md5sum; then
echo "md5sum check FAILED" >> $logfile
echo "dd if=$dev bs=1M count=$imagesizemb 2>>$logfile | md5sum | awk '{print\$1}' > $md5sum" >> $logfile
if ! cmp $md5sum $img.md5sum; then
echo "md5sum check FAILED" >> $logfile
echo "dd if=$dev bs=1M count=$imagesizemb 2>>$logfile | md5sum | awk '{print\$1}' > $md5sum" >> $logfile