Hi, I've recently bought a WD Scorpio Blue WD5000BEVT 500GB 2.5" SATA hard drive to put in my PS3. I decided instead to put this in my MacBook Pro and put the 320GB drive from my MBP in the PS3 - which I have done and works perfectly. Now the problem is the WD HDD in the MBP. I can physically hear the HDD spin down and then almost immediately spin up again. Whilst in this state of "spin down" OSX is a little unresponsive. Does anyone know how to stop the drive from shutting down so often. It literally happens every few seconds. I haven't noticed the problem when booted in Windows 7 though I could be wrong. Any ideas?