NCQ - speeds up reading/writing (the disk spins a little less, and gains access to more data, thanks to diferent algorithm of queque). Only SATA 2 propably got this feature. If you do not care about speed if it cost more - You do not need it.
perpetual something - I do not know.
I work next to a computer parts shop, and currently my fellow salesman says: Western Digital, because this year disks made by WD had lowest number of malfunctioning and returns.
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