Everyone has their preferences, but just like with everything else it all boils down to manufacturing quality and reliability. I won't even begin to make judgments about different brands, but I wouldn't use a WD in a PVR unless I absolutely had to... just based on past experience.
Current 120GB/5400 rpm Maxtors and 80GB/7200 Seagates work for me -- both are quiet in my setups. I'd avoid WD's for the same reasons as KenL (at a previous job, 2 batches of 20 all died). As usual, YMMV.
Unless your computer is already ATA 133 you will have to install a ATA 133 controller in your computer to prep the drive. A ATA 133 controller comes with the Maxtor retail box 160 GB drive (not included in the OEM box).
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