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Does my HDD need to be replaced?
Have 2 x 3TB Segate in my ReadyNAS Duo V2 One failed on me last night so have replaced it with a WD Red - the second Seagate is now also showing some early signs - what do you guys think? ...
ATA errors might be the drive, but they can come from the NAS, or from adjacent drives that are messing up the SATA interface.
The 24 pending sectors are definitely the drive. That means there are 24 sectors that couldn't be read. If writes had failed, they would have been reallocated. But you can't reallocate on reads, because you don't know what data to write into the newly reallocated sectors.
I'd test the drive with Seatools. Even it if passes, look at the SMART stats when the diag finishes. Acronis Drive Monitor is one freeware tool that will show the SMART stats (though you do need to give them your email address to download it).
My personal threshold is (a) > 50 or (b) counts beginning to rise, with new reports every couple of days. If I kept this drive in service, I'd be watching it very closely, and I'd make sure my backups are current.
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