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Defragmentation is the operation of moving file extents (physical allocation blocks) so they eventually merge, preferably into one. Doing so usually requires at least two copy operations: one to move the blocks into some free scratch space on the disk so more movement can happen, and another to finally move the blocks into their intended place.
JkDefrag is a free open-source disk defragmenting utility computer program for Windows.It was developed by Jeroen Kessels (initials "JK", hence the name) beginning in 2004 [1] and was released under the GNU General Public License.
Drive Optimizer (formerly Disk Defragmenter) Microsoft: Bundled with Microsoft Windows: FAT16, FAT32, NTFS, ReFS Windows 2000 and later; Windows 95 and later Yes Yes Yes Yes, with Windows Task Scheduler: No No Same as Windows Diskeeper: Condusiv Technologies: Discontinued (formerly trialware: FAT16, FAT32, NTFS Windows XP and later Yes [5] Yes ...
Defraggler is a freemium defragmentation utility developed by Piriform Software, which can defragment individual files or groups of files on computer memory systems. Defraggler runs on Microsoft Windows; it has support for all versions since Windows XP. It includes support for both IA-32 and x64 versions of these operating systems.
In main memory fragmentation, when a computer program requests blocks of memory from the computer system, the blocks are allocated in chunks. When the computer program is finished with a chunk, it can free it back to the system, making it available to later be allocated again to another or the same program.
From this, the user can select sections of the disk, see a list of the files in that section showing information regarding individual file fragmentation and location, and individually defragment files or drag and drop them to the desired section on the disk. [2] [3] Along with defragmentation, UltimateDefrag performs consolidation of both disk ...
Using PageDefrag may improve performance. Since PageDefrag only affects a few files, it takes a relatively short time to run when compared to entire-disk defragmenters such as Windows Defrag, so long as the page file is not fragmented. If the page file is fragmented, PageDefrag can take as long or longer than Windows Defrag.
This utility can be used to defragment specific volumes or to just analyze volumes as the defragmenter would in Windows XP. Disk Defragmenter is maintained by Microsoft's Core File Services. The Windows Vista version has been updated in Windows Vista SP1 to include the improvements made in Windows Server 2008.