In reality there is no sufficiently-safe way to wipe drives today. If you really care, you destroy the drive. With AES-NI, there's little excuse for not doing d

In reality there is no sufficiently-safe way to wipe drives today. If you really care, you destroy the drive. With AES-NI, there's little excuse for not doing disk-crypto-by-default, so if the drive never saw unencrypted data, and your data is only slightly to moderately sensitive, you could probably get away with logical deletion and then a precautionary drive-level or multi-pass overwrite, but if it's something genuinely high security, no sane policy allows drives to leave in any form but dust. (Within an organization at the same security level, deletion and then wipe is enough to re-issue a laptop, but not going from top researcher to intern, and certainly not from inside to outside.)