When I work on PCs, I'm often amazed to see Win2k/WinXP boxes running FAT32 partitions rather than NTFS... NTFS is faster, more stable and more secure than FAT32. I guess people are just worried about killing their OS and not being able to access their old files. If you're using a FAT32 partition and notice your HDD slowing down the rest of your computer, you can convert file systems without having to repartition the drive. Load up your command prompt (Start, Run then type CMD and press the Ok button) and there type this command "Convert x: /FS:NTFS" (where x is the drive letter you want to convert). When you press enter, it'll ask you for a confirmation so press "Y" to each question, and then hit enter. This will force your system to reboot and start the conversion.