JkDefrag

Free, 3rd party defragger. There is also a GUI command interface for JkDefrag called JkDefragGUI.

JkDefrag 3.7 uses Windows' own native MoveFile APIs to do its work, so using the program entails little risk of data corruption.

The application is standalone; it can be run in any directory and requires no installation, so it can even be run from a removable drive as part of a portable software toolkit. Any mountable read-write file system in Windows can be defragmented with it.

Some of the program's more sophisticated features are the sorts of things you usually only see in defragmentation software you pay for:

• Allows you to move seldom-used files to the end of the disk
• Force all files to move to the front of the disk (i.e., as a prelude to resizing a partition).
• The utility also moves all directory structures to the front of the disk
• Creates a free-space buffer at the front 1% of the disk
• Frees up space in the MFT reserved zone whenever possible.

More...