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The following information can help you to optimize, repair, or gain a better understanding of how your NTFS volumes use disk space. Other NTFS features may cause file-allocation confusion.NTFS corruption causes free space to be reported as in use.Files or folders contain alternate data streams.NTFS metafiles (such as the Master File Table) have grown, and you cannot de-allocate them.

Folders or files contain invalid or reserved file names.

The folder path exceeds 255 characters.

File attributes or NTFS permissions prevent Windows Explorer or a Windows command prompt from displaying or accessing files or folders.The NTFS volume's cluster size is too large for the average-sized files that are stored there.The disk space allocation of an NTFS volume may appear to be misreported for any of the following reasons: This behavior may also occur after a computer malfunction or power outage occurs that cause volume corruption. These files then have their NTFS permissions removed or restricted. This may occur if malicious or unauthorized access to an NTFS volume where large files or a high quantity of small files are secretly copied has occurred. For example, an NTFS volume may suddenly appear to become full for no reason, and an administrator cannot find the cause or locate the offending folders and files. NTFS supports many volume and file-level features that may lead to what appear to be lost or incorrectly reported free disk space. This article discusses how to check an NTFS file system's disk space allocation to discover offending files and folders or look for volume corruption in Microsoft Windows Server 2003-based computers.Īpplies to: Windows Server 2003 Original KB number: 814594 Summary

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