[markw10]

I am used to having to Defragment hard drives on the PC. Is this necessary on the Mac and if so is there a good program to buy to do it or does this come with the computer?

[reader50]

As of 10.4.x, there is no included utility to defrag. The system will defrag certain files in the background that are not too big, and the Mac file system (HFS+) is resistant to file fragmentation anyway.

The average user does not need to defrag, and will not benefit from a defrag until they've used a disk for a few years. Even then, the speedup won't be very much.