I bought a Western Digital Scorpio Black WD3200BEKT 320GB 7200 RPM HD that I have yet to install in my MacBook 1.1. I found the following review on the Newegg site. Accurate or not? "It should be noted that this drive doesn't work very well with MacBooks and/or Macs in general. I didn't do much research on this product before purchasing it, my mistake. It turns out that some Western Digital Scorpio Black drives have a problem with an OS X battery saving feature. This means that the drive will spin up more often than not, causing load/unload cycles to spike. This causes something like a "clunk" sound every 10-20 seconds. These excessive load/unload cycles can cause premature failure of the drive and very noticeable noise. I also noticed, aside from this noise every 10-20 seconds, the drive was just generally loud. This could just be because it's 7200RPM and I had a 5400rpm drive before and I wasn't used to the faster drive, but it was the equivalent of my MacBooks fans on at 70% (4000rpm). Other than the noise issue and the possible early failure rate, this drive was great. It was noticeably faster than the 5400rpm drive."