High Quality Content by WIKIPEDIA articles! Disk Defragmenter is a computer program included in Microsoft Windows designed to increase access speed by rearranging files stored on a disk to occupy contiguous storage locations, a technique commonly known as defragmenting. The purpose is to optimize the time it takes to read and write files to/from the disk by minimizing head travel time and maximizing the transfer rate. As of Windows XP, Disk Defragmenter is also used to improve system startup times.MS-DOS versions up to version 5 did not include any defragmentation capabilities. When Defrag, licensed from Symantec, was shipped for free with MS-DOS 6.0, the use of the alternative commercial products became less frequent, because customers were unable to justify the additional expense.

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