Difference between these 2 WD drives?

The more expensive drive is a RAID edition drive, RE2 = RAID Edition 2. It has TLER officially supported (though it can be enabled shadily on the other drive as well), and I believe it has some other reliability/performance feature relevant to RAID/many-disk-systems which had something to do with vibrations if I remember correctly.

I don't think it's worth it going for the RE2 drive unless you're going for a RAID setup. From what I gather there isn't that much of a difference in reliability in a home user scenario.
 
The more expensive one claims it uses less power too.

I would go with the cheaper one if it were me.

Don
 
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