测试 USB 的 读写

#!/bin/sh
#mkdir /sda
#mkfs.ext4 /dev/sda1
#mount -t ext4 /dev/sda1 /sda
count=1
while [ 1 ];
do
md5_usb=c33f04ad3d677779f6f9986a0604b1ee
cp /tmp/ubuntu-18.04.4-desktop-amd64.iso /sda/test.iso
sync
md5_usb_write=`md5sum /sda/test.iso | awk '{print$1}'`

if [ $md5_usb = $md5_usb_write ]
then
    echo -e "
"
    echo "===the $count times usb_md5 copy success==="
    let count=$count+1
    rm /sda/test.iso
else
    echo "usb_md5 failed"
fi 
done