In my desktop I have 3 x 120gb OCZ vertex 3's. One is the boot drive and runs solo, the other two are in a RAID 0 and are mainly for games and all three are because I like the speed. I purchased these because at the time, they were the best performance per dollar that I could afford. For mass storage, I have 2 x 2TB WD red drives in a RAID 1 so ensure I don't lose my data. I have WD reds because that is what Linus suggested and i needed something that could run 24/7.
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