On 11/07/2019 01.43, Andrey Zhunev wrote: > > Ok, the ddrescue finished copying whatever it was able to recover. > There were many unreadable sectors near the end of the drive. > In total, there were over 170 pending sectors reported by SMART. > > I then ran the following commands: > > # smartctl -l scterc,900,100 /dev/sda > # echo 180 > /sys/block/sda/device/timeout > > But this didn't help at all. The unreadable sectors still remained > unreadable. > > So I wiped them with hdparm: > # hdparm --yes-i-know-what-i-am-doing --write-sector <sector_number> /dev/sda This has always eluded me. How did you know the sector numbers? At this point, I typically take the brutal approach of overwriting the entire partition (or disk) with zeroes using dd, which works as a destructive write test ;-) Previous to that, I attempt to create an image with ddrescue, of course. > > I then re-read all these sectors, and they were all read correctly. > > The number of pending sectors reported by SMART dropped down to 7. > Interestingly, there are still NO reallocated sectors reported. I suspect that the figure SMART reports only starts to rise after some unknown amount of sectors have been remapped, so when the numbers actually appear there, it is serious. -- Cheers / Saludos, Carlos E. R. (from 15.0 x86_64 at Telcontar)
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