Just to clear a few things up. FAT32 actually came out with Windows 98. The problem with FAT(File Allocation Table)32 is that there are no security functions. All files are accessible by anyone connecting to your computer.
If you convert to NTFS then yes George it is irreversible, but who would want to go back to it anyway?
NTFS is more secure and more stable than FAT32 (how many times did Windows 98 crash for you?) A couple of people have asked to be able to secure their KMA files to prevent them being copied by an employee. This is one way to make it much harder for them to copy the files.
This is the link to the command information sheet:
http://www.microsoft.com/resources/d....mspx?mfr=true
Or to simplify it - Click on Start, and go to Run. Type "cmd" and hit enter. This will open a "DOS" window. Type in
convert e: /fs:ntfs /v (e: being the drive you want to convert. This does not erase your files, however it is always a good idea to make a backup before starting anything like this. If the command cannot lock (have exclusive use) your drive, then it will offer to do it on the next restart.