I meant if I am on full disk encryption if it's worth the extra CPU
clocks to do a safe erase of certain files, given the data is already
random looking from the outside. It wasn't about the whole drive.
The point is exactly that: your data looks random from the outside, but not from the inside. If an attacker gets access to your running computer or discovers your password, dm-crypt cannot protect you, because the attacker has access to your unencrypted hard drive.
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