I'm not a MAC user and I know how to defragment my PC, but my studio are asking how to do it on their MACs and I can't find it, is it in there somewhere?

The only utilities I'm aware of are PlusOptimizer and Norton.

Doesn't rebuilding the desktop usually do the trick. I remember you hold the apple or command button down as it's starting up or something.

``Rebuilding the desktop'' is really just reindexing all the files on the computer. It's certainly related to defragmenting, but not the same. If you want to do that, hold down Apple-Option during a reboot.

I realise it's not the same. I was just saying that with my limited experience of Macs (thankfully), it usually did the trick when the machine started to slow down.

They must not include a mac defragmenter because macs never get fragmented! (at least that's what they want you to believe)

Also, OS 10.3 defragments small files automatically.
-Mike

Also, Rebuilding the Desktop is a Mac OS 9 and lower "feature" only. OS X has no such equivelent because it is not needed.

As as stated, 10.3 has built in defragmenting on files under 20 megs. Also has built in optimizations to place the most used files/programs on the quicker parts of the disk.