#!/bin/sh

DEV=/dev/sda1
MNT=/media/testdev

mount $DEV $MNT
find $MNT > /tmp/files
umount $DEV $MNT

for i in 1 2; do
    (
    while true; do
        mount $DEV $MNT
        umount $DEV $MNT
    done
    )&
done

IFS='
'
for file in `cat /tmp/files`; do
    md5sum $file > /dev/null
done