Date   : Sun, 25 Dec 1983 17:18:00 EST
From   : Herb Lin <LIN@mit-ml>
Subject: checksumming program for backing up disks...

When I back up my disks, I live in constant fear that I am trashing
a good copy of a file on my backup with a bad copy that somehow
found its way onto the disk that I am backing up.

it seems that a good solution to this would be the checksumming (or
other check) on a disk file that could be compared to a central file
of checksums somewhere.  Anyone know anything like this in 
the public domain or for cheap sale?

tnx.  I will forward responses to the net.

herb lin