Simon Hobson writes:
[1] The drive "most likely" does not know about partitioning, and even if it did, it would be very dangerous to assume that any space not occupied by a partition was "fair game" to be erased since there may be other ways the space might be used (for example, the way Grub uses space before the first partition). So if the space has been used before, re-partitioning without somehow informing the drive that the excess space is now free, will not give any benefit.

Hm... I had to trace the commands issued to a buggy drive a few years ago, and ubuntu certainly TRIMmed the entire drive as part of installing when I told it to get rid of all the existing data on the drive. I think the TRIM was issued by the installer, but don't hold me to that.

(The bug was related to SATA command timeouts and very large TRIM commands, FWIW.)

Arnt
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