These days, just use TRIM support. As long as your filesystem isn't 100%
full, this is going to achieve the same (actually better) effect. With
either approach, the drive will have plenty of unused space for wear
leveling. With TRIM, the drive also knows not to bother copying data
around for sections of the disk that are not used.
If, in spite of the advice above, you insist on doing the
underprovisioning thing, look into setting an HPA (host protected area).
You can tell the drive to report that it is smaller (e.g. you can ask
your 200 GB SSD to report as 150 GB). An HPA, being a thing set on the
drive, persists across installs. Keep in mind that setting an HPA erases
all the data!
--
Richard
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