I keep getting alot of system overloads in Logic 9. I got a unibody macbook pro late 2008 with 2,4ghz, 4gb ram and a 250gb 5400rpm. I usualy got around 30 tracks in logic. I mainly get the overloads when pressing play or when I browse other applications wile it's on play. Sounds like the hard drive? When the mac was new I never got overloads. But then I used logic 8 and osx 10.5, now I got logic 9 and 10.6. I'm more of a PC user and don't know how to maintain my mac in good shape, I've never done a clean install since 2008 and all I have done so far is to upgrade from 10.5 to 10.6. Can I do some kind of defrag as in windows? What should I think of to get best possible performance in Logic? I was thinking about getting a 500gb hd instead of this one if I cant fix my current hd, but I'm not sure if I should get 5400 or 7200 rpm. I read that a bigger hd gets better performance because of the higher density of data and that a 500gb 5400rpm should beat a 250gb quite well. But it may as well be bulls... Thankful for answers!