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CRC tagging is useful in a few cases still:
Those people who stash CD's/DVD's with fansubs, it's not uncommon for optical media to "lose data" over time. With a CRC tag (or SFV file - that's basically just a list of filenames and the expected CRC for them) you can at least check whether the files are still intact.
Then there's the case of private sharing parties or such. Sometimes you can also get corruption when copying over a network using a non-verifying protocol.
And of course just the case of other disks going bad.
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