The Defrag for Windows XP works very well, and usually finishes within a few hours.

I tried to run Vista Home 64's defrag. There is no status bar, no analysis information. But the worst part is that it doesn't work, and it never finishes.

I've run this stupid thing for 24 hours + before finally cancelling in frustration.

Then I read on the internet that Vista Defrag uses a new algorithm.

The XP Defrag algorithm will join an entire defragged file and puts it in one continuous location on disk.

ista defrag only defrags 64 megabyte chunks, on the idea that anything beyond that is inconsequential in I/O speed, and that it won't need the as much HD freespace to perform the defrag.

But I think the Vista Defrag's 64 meg chunk approach is flawed, since it's forcing a check on EVERY SINGLE 64 megabyte block of every file.

This makes this stupid thing run forever, and in the end, it's not even defragging the files as good as Defrag XP. The results is a 24 hour + run, with files still fragmented in 64 meg chunks.