Preparing Your Hard Disks
If you're using an existing disk with lots of data as your capture and edit drive, you should defragment the drive before installing Movie Maker. During normal disk operation, Windows copies and deletes files all over the drive, sometimes splitting longer files and placing them in widely separated places on your hard drive when writing them to disk. Defragmenting the drive reunites all file components and packs the files efficiently together on the drive, opening up large contiguous spaces to enable smooth capture and fast editing of your video.
Before defragmenting, delete all unnecessary files on the drive, especially larger files, since they take up space and can slow the defragmenting process significantly. I usually ...
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