The title basically says it all. Are all hard drives clicking the same amount, but it's just more noticeable on certain HDs because of the drive's design? I understand that the over parking of the heads can lead to premature hard drive failure (load cycle count). My 500GB blue scorpio has been parking a ton. It's up close to a thousand and I've used it for 24 hours maybe. So I used hdapm to set it to max and it's stopped the clicking. Anyways, is it a Mac OS problem meaning, it's the OS that determines the load cycle count? Or will some hard drive not have as many load cycles?