Summary: Unfortunately I installed this drive, which I bought from OWC in a 24" iMac without testing it to be sure it was good (especially as it was labeled, much to my surprise, as "refurbished"...silly me as I got the computer all assembled and powered it up only to hear the scan back and forth as it struggled to perform its self test. Bummer.
Summary: Great hard disk, improvment over stock in size and speed. Where mos hard disk of the size are noisy and slow this one is quiet and quick. Since I have started using Hitachi drives, I have been much happier and experience less failure than I did with Western Digital.
Summary: We had great difficulty with this device. It stopped working within a couple of months. We have contacted the company several times but they have not been responsive. I had to purchase a completely new (and different!) product.