Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Not really for novice Mac users

The Retrospect software included with this hard drive is not for the novice. I've used a Western Digital external hard drive successfully for my Windows computer, but after a several hours of fiddling with the software I still haven't achieved a successful backup on my Mac. WD customer support for the Mac has been useless; the software supplier, EMC, wanted $70 to consider my questions.