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Hi Dave, At our library we use the following tools (links below to our guidelines) to confirm transfer of digital files. I personally haven't used these tools with such a large dataset as your's but might be worth testing. Robocopy (Robust File Copy) for PC http://tinyurl.com/ke9esag rsync for MAC http://tinyurl.com/kgoqb2c then for confirming no changes over time, we use checksums generating tools such as DROID (then compare using Excel) or Quickhash [1] Here some helpful explanation of using checksums, _File Verification using MD5 Checksums_[2] Hope this helps, Monica Quoting "Bigwood, David" <[log in to unmask]>: > Open for suggestions for a fingerprinting tool. I think that's what > they are called. > > We are copying NASA imagery to make available to the public. They > send us a hard drive with about 10,000 images and we copy them to a > drive then return the original. > > I'd like a tool that would compare the 2 drives to make sure > everything was copied correctly. Then something that would be able to > tell if some file had degraded, went missing or been changed over > time. > > Thanks, > David Bigwood > [log in to unmask]<mailto:[log in to unmask]> > Lunar and Planetary Institute > > !DSPAM:2489,58de698c39341730784676! Links: ------ [1] https://www.foolishit.com/free-tech-tools/quickhash/ [2] http://www.controlledvocabulary.com/imagedatabases/file-verification.html Digital Curation Coordinator Digital Scholarship Services Fondren Library, Rice University