Why might one hard disk perform slower than another?

Posted by Styne666 on Super User See other posts from Super User or by Styne666
Published on 2014-06-11T20:30:15Z Indexed on 2014/06/11 21:28 UTC
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hard-drive

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Performance

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burn-in

I have just bought two WD 3TB Reds (WD30EFRX) for a FreeNAS box and whilst doing burn-in testing it seems like one is consistently taking about 10% longer than the other.

So far I've done: a dd read test of the whole device, a long SMART test and it's currently halfway through a badblocks -wvs. The second device is lagging behind the first on all of them.

I'm running these commands on Debian stable in two Konsole tabs. Is there a reason this could be considered normal behaviour or is it worth running the tests independantly? They're both plugged in to the LSI 2308 (IT mode) on a Supermicro X10SL7-F.

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