I use a SSD for the OS only. It makes a significant difference on startup. If you can afford it, I'd recommend this route. I've been using the OCZ 60 GB SSD and haven't had any problems in 2 years. also have a Corsair Force Series GT CSSD-F90GBGT-BK 2.5" 90GB SATA III that I have been using for 6 months with no issues. I am not sure how I would know if a SSD was failing though.
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