On Fri, Feb 09, 2024 at 07:50:18AM -0500, Stefan Monnier wrote: > > BTW2, there is a program for that, "badblocks", part of e2fsprograms, so > > chances are it's installed. I'd look into that man page. > > `badblocks` sadly writes the same pattern on every block, AFAIK, so if > the drive just remaps new logical blocks to already used physical > blocks, `badblocks` may be convinced that the drive works fine even when > it doesn't.
Absolutely right. And most probably it checks a block right after writing, and doesn't try to fill up the disk first. > So, if you want to use `badblocks`, you may want to do it on an > encrypted partition (that covers the whole device) rather than on the > raw device. This is an interesting idea. I haven't wrapped my head around "what if the controller maps several block addresses to the same physical block"? Perhaps you'd have to fill the disk and check afterwards? Cheers -- t
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