Martin Howard , May 12, 2010; 05:37 a.m.
32MB vs 64MB cache is currently a marketing gimmick for the current gen of HD's.
Installation is easy assuming you having a spare SATA 2 port on your motherboard.
Once physically installed in will need enabling in Computer management >disk management.
Which WD drive are you looking at? I would take a look at the Samsung F3 drives as well, they are very strong performers.