On Sun, Dec 25, 2022 at 10:27:49AM -0500, Mouse wrote: > >> According to that PDF, dholland is wrong. > > I fail to see a behaviour that would be allowed due to dholland@'s > > definition, but not according to the one you cited, nor the other way > > round. > > A read returning the pre-TRIM contents. Two of the options > specifically state "independent of the previously written value"; the > third is simply zero, which is also independent of the previously > written value. dholland wrote > > > The state of the data after TRIM is unspecified; you might read the > > old data, you might read zeros or ones, you might (I think) even read > > something else. > > and, as I read that PDF, "you might read the old data" is specifically > disallowed.
I believe the drive is allowed to discard the request, in which case you'll read the old data. I expect at that point the block is not "trimmed" but ... that's a detail. I know at least some drives will ignore single-sector trims. -- David A. Holland dholl...@netbsd.org
