[CaptainCrash]

I'm rather sceptical about the merits of third-party defraggers in Vista - I've yet to see any concrete evidence that they measurably improve real-world performance beyond the inbuilt tools, rather than just providing a pretty picture of files being shuffled around and a nice placebo effect.

I guess if you have a large data partition that contains a mixture of filetypes and access patterns, there could be some merit in shifting large, infrequently used files towards the end of the disk, leaving the fast outer tracks free for "working" data (AFAIK PerfectDisk and Diskeeper won't do this, whereas the free JKDefrag can, with the right command-line arguments). Not something worth obsessing over though IMHO...