Smart Defrag | Free Disk Defragmenter

Smart Defrag comes with a selection of defragmentation mechanisms, scheduling and an online defragger (runs in the background). It works on XP, 2003, 2008, Vista (32 bit and 64 bit).

One particularly nice feature is the Auto Defrag feature, which defragments your hard disk only when you computer is idle, so that you don’t interrupt or slow down any work.

Note that by default, Smart Defrag installs the Yahoo Toolbar, so if you don’t want it installed, uncheck the box when you install the program.