Defragmenting non-HFS volumes?

I have an external USB HD that I occasionally use to exchange large data files with PCs. I'd like to reformat it. I upgraded to the TechTool Pro, but it only degfragments HFS and HFS+ volumes.
Is there something that I can use on a Mac OS X that will defragment a non-HFS external drive?
Thanks!
Mark

Hi Mark!
Mac OS X will optimize files on the fly but if your drive is nearly full then even this can only work so well. If it's mostly empty then you most likely don't need to optimize at all. Have a look at this tech article on Apple's site <http://docs.info.apple.com/article.html?artnum=25668>.
I looked at a few disk utilities (from open source to commercial) and didn't find anything specifically that addressed anything other than HFS. Some such as Drive Genius from ProSoft <http://www.prosofteng.com/products/drivegeniusinfo.php> offer a free trial so that you can determine if it meets your needs.
Of course, the cheap man's alternative to optimization would be to simply copy all the files from your drive to your computer's hard drive or another external drive, format the disk and copy everything back on. It's just as effective.
Hope this helps! bill
1 GHz Powerbook G4   Mac OS X (10.4.8)  

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