Which disks for parity?


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I currently have 4x WD Red (CMR) drives, 1 acting as parity and the 3 other as data. I'm planning to double up that array with a total of 8x4TB, probably going from 1 to 2 parity drives. I will buy more WD Red drives for my data while the CMR drives are still available (WD40EFRX, not WD40EFAX). At the same time, I was wondering if I would be better putting the parity on 7200rpm drives? Or just "better" drives in general? I was thinking WD Red Pro or WD Gold.

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