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Forum Discussion
WDC Reds Not Suitable?
I just finished reading this writeup: http://www.smbitjournal.com/2014/05/understanding-the-western-digital-sata-drive-lineup-2014/ This comment, about halfway down in the Red section, stood out...
10^14 URE is the normal spec for consumer drives as well as the Reds. There's no problem using them in parity RAID arrays, despite the comment in the writeup (which is his opinion).
URE -> unrecoverable read error. The read attempt simply fails, and normal raid repairs it. As the article says:
BitRot protection isn't relevant, as there is no silent corruption happening. Backups protect against this risk (and others).
You can get better specs by getting enterprise drives or WDC RED Pros (WD4001FFSX). A WD4001FFSX costs about $65 more than the WD40EFRX, and has a 10^15 URE spec (and overall looks like an excellent drive). Though you still need backups anyway, since there are other risks in trusting your data to a single device.
URE -> unrecoverable read error. The read attempt simply fails, and normal raid repairs it. As the article says:
So the risk he is talking about is when a disk has already failed, and you get a URE on a second disk. In other words- a multiple disk failure, which does happen.
In healthy RAID arrays (other than RAID 0), the RAID system provides mirroring and/or parity that can cover for this sector failure and recreate the data protecting us from URE issues. When a RAID array is in a degraded state UREs are a potential risk again.
BitRot protection isn't relevant, as there is no silent corruption happening. Backups protect against this risk (and others).
You can get better specs by getting enterprise drives or WDC RED Pros (WD4001FFSX). A WD4001FFSX costs about $65 more than the WD40EFRX, and has a 10^15 URE spec (and overall looks like an excellent drive). Though you still need backups anyway, since there are other risks in trusting your data to a single device.
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