Microsoft KB Archive/837336

= &quot;Disk Defragmenter cannot defragment NTFS drives with more than 4 KB per cluster&quot; in Windows 2000 =

Article ID: 837336

Article Last Modified on 10/30/2006

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Datacenter Server
 * Microsoft Windows 2000 Professional Edition

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SYMPTOMS
When you try to defragment a drive that uses the NTFS file system, you may receive an error message that is similar to the following:

Disk Defragmenter cannot defragment NTFS drives with more than 4 KB per cluster.



CAUSE
This issue occurs because the NTFS compressed file functions map files in memory by using 4 kilobyte (KB) blocks. Therefore, these functions do not support cluster sizes that are larger than 4 KB.



WORKAROUND
To work around this issue, format the NTFS drive by using an allocation unit size that is less than or equal to 4 KB (4096 bytes).

