full-featured disk defragmenter
UltraDefrag Portable is a full featured disk defragmenter packaged as a portable app so you can fix-up hard drives on the go. Like most system utilities, this app requires admin rights.
UltraDefrag Portable works best with the PortableApps.com Platform
Defragmenting Flash Drives: Flash media has specifically been excluded from the drive list as flash drives should not be defragmented (it does not increase access speed and shortens the life of the drive). If you wish to enable it anyway, you can change this in the options.