App that will compare contents of two large external drives?

Hi-
I have two external 1 TB drives. They are supposed to have identical content but don't. I would like to see what files drive A has on it that drive B doesn't.
Is there an app that will scan both drives and tell me what files drive B is missing?
Thank you!

This is a nice use for command-line utilities. There are actually many variations on how you want the answer of what question. Disks are treated as folders in Unix, and presumably MacOSX. You can find them in /dev. The disk0 is the boot disk. Output of 'diff' is ready for use in scripts with 'ed' or 'sed'.
Darwin commands & scripts
You can experiment with 'apropos diff', 'whatis diff', 'whereis diff', and 'man diff | cat', where diff can be replaced with any command. Some useful commands might be 'diff', 'uniq', and 'crc' or 'md5'.
Aqua applications
If you're not interested in learning a Unix script language, you can find several suitable Aqua front-ends for them at Sorceforge, MacUpdate, or VersionFinder.
http://www.macupdate.com/info.php/id/25426/diffmerge
Bruce

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