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From: "Steven G. Kargl" <sgk@REMOVEtroutmask.apl.washington.edu>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: data-preserving HDD diagnostic program?
Date: Fri, 16 Aug 2024 05:51:22 -0000 (UTC)
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On Thu, 15 Aug 2024 11:29:45 -0400, Winston wrote:

> Is there a good FreeBSD HDD diagnostic program?
> 
> The SATA III disk drive I'd like to test is either partially failing or
> has corrupted data.  MS Win10's "repair" of the drive isn't fixing it.
> For that and other reasons, I suspect the drive has partially died
> (such as maybe 1 head died or something).
> 
> In any case, I'd like to test it while preserving the data on it.
> E.g., read a block and save its content, write 0101s, verify 0101s,
> write 1010s, verify 1010s, write back original content, verify, print
> map of what failed.
> 
> It's maybe not all that hard to write such a program, but there are
> probably things like disabling low-level retries and any FreeBSD
> caching I know less about.
> 
> In any case, is there such a diagnostic?
> 

Look in /usr/ports/sysutils.  There are several tools such as
smartmontools, hdrecover, recoverdm, etc.

-- 
steve