Is there a Mac hard drive utility that tells you how many hours use the drive has? Does this utility work for external USB and Firewire drives as well as internal drives? I need to purchase some new hard drives and was reading some reviews on Amazon.com from PC owners who have some kind of utility that tells them how many hours use is on their drives, and some have found that drives that they purchased NEW had many hours of use on them, that they really weren't new at all, but sold as new. These drives were purchased on Amazon and shipped by Amazon, so you'd feel like you were buying from a reputable seller. I'd like to be able to check all the new drives that I purchase.