Disk Defragmenters
Portable tools that can be used to defragment your hard disks
PageDefrag - Portable Defrag Tool
PageDefrag is a free portable defragmenter that allows you to defragment files that you might otherwise be unable to defragment with typical defragmenting tools. Files such as registry, paging, event log and hibernation files or those that are open for exclusive access are just a few examples of what this
Ultimate Defrag - Portable Defragmenter
UltimateDefrag (Freeware Edition) is a Free Portable Defragmenter that "allows you to optimize your hard drive any way you want". This free defrag tool enables a user to not only defrag files on a disk, but also put frequently accessed files in areas on your hard drive where they will achieve maximum performance.
UltraDefrag - Defragmenter
Ultra Defrag is a Free Portable Defragmenter for Windows created by the ultradefrag development team. Unlike some defragmentation tools, this powerful open source defragmenter can perform boot time defragmentation and is capable of quickly and efficiently defragmenting all files, including system locked files, registry hives, and paging files.