WD questions

What's the difference between the "WD SATA300 500GB - 7200 WESTERN Caviar [5000AAJS]" and "SATA300 500GB - 7200 WESTERN RE (16 MB) [WD5000YS]" and "SATA300 500GB - 7200 WESTERN DIGITAL Caviar SE16 (16MB) [WD5000KS]" and "SATA300 500GB - 7200 WESTERN Caviar SE16 (16MB) [WD5000AAKS]" ?
I've put them in price order... they're all SATA 300, 500GB, and all except the first one have 16MB...
But their prices are different, so what's their difference? :O
Please tell me ASAP cause I'm gonna purchase one tomorrow...
Thanks!
 
The YS model has a 5 year warranty and is designed with RAID arrays in mind.

I'm not sure about the other two, but the KS model might be a retail box, which can up the price. It looks like it has either a 1-year or 3-year warranty.

I'm not sure about the others.
 
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