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which hdtoolbox version? (afaik only 3.9bb2 version supports very large drives without strange glitches)
About direct scsi error:
It is likely that "normal" access methods do few automatic retries if it detects SCSI bus related error before returning error to caller (hides the random error).
Direct SCSI passes the command directly to drive, without any pre/post processing or retries. I can add automatic retries but first I'd like to see exactly what kind of error gets reported by the drive.
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