Defrag
From PearPC
Defragmentation (or defragging) is a process that eliminates fragmentation in file systems. When used it can increase the performance of reads and writes to a disk.
Utilities
For Windows (FAT and NTFS), a defragmentation utility called "Disk Defragmenter" can be found in the All Programs -> Accessories -> System Tools folder of the Start Menu.
For Linux (ext2), an offline defragmenter called e2defrag can be used.
