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Forum Discussion
Disk is showing high Reallocated Sector Count and ATA Error Count
I have two ST31000340NS disks which have been in my Duo for many years, after a couple of annoying power outages (before I had an UPS) one of them started to show a Reallocated Sector Count, and also...
Thank you for your reply, most helpful.
Note that I already have the 2TB HGST drives, they are on their way out of my NV+ (currently synching in a pair of 3TB disks), one has 2 Reallocated Sector Count but no ATA Errors, so I'm saying that's still good.
A reallocated sector is in the word - reallocated. So, the HDD detected and issue with a sector and moved the data to another area on the drive and marked the original sector as bad. This is a better outcome than an uncorrectable sector error where the data in sector is lost and can't be recovered (though through RAID parity, the filesystem will recover the file(s)).
I couple of reallocated sectors isn't necessarily a sign of imminent failure of the drive in the near future, so if your drive has like 2 reallocated sectors errors now, I would simply keep an eye on it and if it start to increase - replace it ASAP.
Always keep up-to-date backups!
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