
In mid-2011 iMac 27" hard drive decided to screw up mine (see 2011 iMac built-in OWC digital sensor review which I also wrote). Decided to replace the original 1TB internal replacing hard drive with solid state 120gb drive and a massive 3tb hard drive after some searching on the web i found this cable was probably what i needed if you buy it use the ifixit and OWC tutorials. Take your time and it should work. My hard drive installs took me about 1 hour 30 minutes from start to finish and I was able to get my computer working again after the hard drive crashed. Only gripe is, that I didn't get any glue despite the Amazon description.This isn't a problem as I had strong double sided tape at home but just let them know.

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