user01@ubuntu:~/Desktop$ sudo md5sum /dev/sdb
b951d321a6f0d2e1746e4f72e02e7a34 /dev/sdb
user01@ubuntu:~/Desktop$ sudo dd if=/dev/sdb of=dev.raw
61440+0 records in
61440+0 records out
31457280 bytes (31 MB) copied, 1,16646 s, 27,0 MB/s
user01@ubuntu:~/Desktop$ md5sum dev.raw
b951d321a6f0d2e1746e4f72e02e7a34 dev.raw
user01@ubuntu:~/Desktop$ sudo md5sum /dev/sdb1
a419835d67f02782dc46a9a019771ed5 /dev/sdb1
user01@ubuntu:~/Desktop$ sudo md5sum /dev/sdb1
a419835d67f02782dc46a9a019771ed5 /dev/sdb1
user01@ubuntu:~/Desktop$ mv /media/ext3_1/28/42 /media/ext3_1/28/43
user01@ubuntu:~/Desktop$ sudo md5sum /dev/sdb1
ca9226b52eecc1e0aae812250f40d837 /dev/sdb1
user01@ubuntu:~/Desktop$ sudo md5sum /dev/sdb
b951d321a6f0d2e1746e4f72e02e7a34 /dev/sdb