Windows NT provides an API that 3rd party defragmentation tools can use defragment partitions. The initial API for online defragmentation was rather limited, but have been extended with each new versions of Windows NT.
- Cannot defragment NTFS partitions with a cluster size larger than 4 KByte (Increased to 64 KByte with WinXP)
- Cannot defragment NTFS system files like MFT. (Limitation removed with WinXP)
- Cannot defragment directories (Limitation removed with Win2k)
- Cannot move a single cluster at a time but 16 at a time (Limitation removed with WinXP)
- More Info MS KB227463, MS KB942092
The following 3rd party freeware defragmenting tools are available:
- SysInternals PageDefrag (Offline defragmentation only)
- Execsoft DiskKeeper Lite Download DisKeeper (Has nag screen)
- O&O Defrag 2000 Mirror
- Kessels JkDefrag (Open Source)
- DIRMS & BUZZSAW (Command-line)
- UltraDefrag - Ultra Defragmenter (Opensource)
- IObit SmartDefrag
- Piriform Defraggler
- Auslogics Disk Defrag
- Command line wrappers for dfrg.msc in Windows 2000 (XP has defrag.exe):
- Execsoft DiskKeeper Full version
- Raxco PerfectDisk
- O&O Defrag
- Norton Speeddisk for NT by Symantec
- Vopt
- Paragon - Total Defrag
Credits ArsTechnica.com
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