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Infrequently accessed files are compressed to free up disk space while leaving the frequently used files uncompressed for faster read/write access times. If after file compression, a user wishes to access a compressed file, the access times may be increased and vary from system to system.
A disk compression software utility increases the amount of information that can be stored on a hard disk drive of given size. Unlike a file compression utility, which compresses only specified files—and which requires the user to designate the files to be compressed—an on-the-fly disk compression utility works automatically through resident software without the user needing to be aware of ...
On booting the system, the driver would allocate this large file as drive C:, enabling files to be accessed as normal. Microsoft's decision to add disk compression to MS-DOS 6.0 was influenced by the fact that the competing DR DOS had earlier started to include disk compression software since version 6.0 in 1991.
The Disk Cleanup handler to compress old files has been removed. [109] [110] The graphical representation and progress indicator of the defragmentation process or its analysis have been removed from Windows Disk Defragmenter. [111] [112] It is no longer possible to pause the defragmentation process.
Later versions introduced for Windows 2000, Windows XP and Windows Server 2003 are available for download from Microsoft website and included in the Windows CD. Windows Vista is the first version of Windows NT to include a version of Sysprep that was independent of the hardware abstraction layer (HAL), in the "out of box" installation.
In Windows XP, if the Master File Table (MFT) is spread into multiple fragments, defrag.exe and the GUI version can combine the MFT fragments during defragmentation. [11] Windows XP and later has introduced Boot Files Defragment function, this function is enabled by default and can be disabled in Registry.