Quote:
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Older versions of XFS suffered from out-of-order write hazards, which can result in problems such as files being appended to during a crash gaining a tail of garbage on the next mount.
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Snap has been using this/modified since 98. So this may explain the error. When snap went from v1 to 2, it required a hd reinit as part of the process. So they are using a Modified XFS.
While you are at it. SpinRite supports raid drives. It's a $90 program. It may be worth the try. It's written in assembly language, and run from a dos (x86). It is well know for its recovery process. It's a lot cheaper than $15k.
DD on 250gig drive will take about ??????
dd defaults to 512k bytes, for it raw copy. If I recall you can change it to 1024K and it will be faster.
Have you looked closely at the Error Log? Generally it tells you which drive.