Defraggler, developed by Piriform, is a free donationware

Donationware

Donationware is a licensing model that supplies fully operational software to the user and pleads for an optional donation be paid to the programmer or a third-party beneficiary . The amount of the donation may also be stipulated by the author, or it may be left to the discretion of the user,...

 defragmentation

Defragmentation

In the maintenance of file systems, defragmentation is a process that reduces the amount of fragmentation. It does this by physically organizing the contents of the mass storage device used to store files into the smallest number of contiguous regions . It also attempts to create larger regions of...

 utility, which notably allows users to defragment individual files on their computer system. Defraggler runs on Microsoft Windows

Microsoft Windows

Microsoft Windows is a series of operating systems produced by Microsoft.Microsoft introduced an operating environment named Windows on November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces . Microsoft Windows came to dominate the world's personal...

; it has support for all versions since Windows XP

Windows XP

Windows XP is an operating system produced by Microsoft for use on personal computers, including home and business desktops, laptops and media centers. First released to computer manufacturers on August 24, 2001, it is the second most popular version of Windows, based on installed user base...

. It includes support for both IA-32 and x64 versions of these operating systems.

Overview

Defraggler defragment individual files, groups of files (in a folder) or an entire disk partition

Disk partitioning

Disk partitioning is the act of dividing a hard disk drive into multiple logical storage units referred to as partitions, to treat one physical disk drive as if it were multiple disks. Partitions are also termed "slices" for operating systems based on BSD, Solaris or GNU Hurd...

, either by user's command or automatically on a schedule. It supports FAT32, NTFS

NTFS

NTFS is the standard file system of Windows NT, including its later versions Windows 2000, Windows XP, Windows Server 2003, Windows Server 2008, Windows Vista, and Windows 7....

, and exFAT

ExFAT

exFAT is a proprietary, patent-pending file system designed especially for USB flash drives. Developed by Microsoft, it is supported in Windows XP and Windows Server 2003 with update KB955704, Windows Embedded CE 6.0, Windows Vista with Service Pack 1, Windows Server 2008, Windows 7, Windows...

. It can also be installed as portable application

Portable application

A portable application , sometimes also called standalone, is a computer software program designed to run independently from an operating system...

 on a USB flash drive

USB flash drive

A flash drive is a data storage device that consists of flash memory with an integrated Universal Serial Bus interface. flash drives are typically removable and rewritable, and physically much smaller than a floppy disk. Most weigh less than 30 g...

. Defragmenting RAID

RAID

RAID is a storage technology that combines multiple disk drive components into a logical unit...

 disks are also supported, although no details are supplied.

Defraggler was given a 5/5 star rating from Softpedia

Softpedia

Softpedia is an Internet web site that indexes information and provides software downloads. The site also covers major technology, science, health, and entertainment news from both external and in-house sources and provides software and game reviews. , it is one of the top 500 websites according to...

. In Lifehacker's Hive Five for Best Disk Defragmenter, Defraggler received first place.