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If you have an NTFS volume with a high number of folders or files, and a program is running that briefly accesses each of these in turn, the I/O bandwidth used to generate the Last Access Time updates can be a significant percentage of the overall I/O bandwidth. To increase the speed of access to a folder or file, use the fsutil behavior set disablelastaccess command to disable updating the Last Access Time. After you use this command and restart the computer,

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the Last Access Time is no longer updated. If you create a new file, the Last Access Time remains the same as the File Creation Time. For more information about using the fsutil behavior set disablelastaccess command, see Windows XP Professional Help.

Your ability to access your NTFS volumes when you use a multiple-boot configuration to start Windows NT and Windows XP Professional depends on which version of Windows NT you are using. If you are running Windows NT 4.0 Service Pack 4 or later, you can read basic volumes formatted by using the new version of NTFS. Computers running Windows 2000 (or Windows Server 2003) and Windows XP Professional can read the new version of NTFS on both basic and dynamic volumes. Note

When a Windows XP Professional volume is mounted in a computer running Windows NT 4.0 Service Pack 4 or later, most of the new NTFS features are not available. However, most read and write operations are permitted if they do not make use of any new NTFS features. The following features are affected by this configuration. Reparse points Windows NT cannot perform any operations that make use of reparse points.

Disk quotas When you run Windows NT on a multiple-boot configuration that also runs Windows XP Professional, Windows NT ignores disk quotas implemented by Windows XP Professional, allowing you to use more disk space than your quota allows. Encryption Windows NT cannot perform any operations on files encrypted by Windows XP Professional. Sparse files Windows NT cannot perform any operations on sparse files. Windows NT ignores the change journal. No entries are logged when a user

Because NTFS data structures are not the same for Windows NT 4.0 and Windows XP Professional, Windows NT 4.0 disk tools such as Chkdsk and Autochk do not work on NTFS volumes formatted or upgraded by Windows XP Professional. These tools check the version stamp of NTFS. After installing Windows XP Professional, you must run the updated version of these disk tools on their NTFS volumes.

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Because files on volumes formatted by using the version of NTFS included with Windows XP Professional can be read and written to by Windows NT 4.0 Service Pack 4 or later, Windows XP Professional might need to perform cleanup operations to ensure the consistency of the data structures of a volume after it is mounted on a computer running Windows NT. Windows XP Professional does not perform cleanup operations on volumes previously mounted by using Windows 2000. Cleanup operations affect the following features. Reparse points Computers running Windows NT 4.0 or earlier cannot access files that have reparse points, so no cleanup operations are necessary. Disk quotas If disk quotas are turned off, Windows XP Professional performs no cleanup operations. If disk quotas are turned on, Windows XP Professional cleans up the quota information by rebuilding the index. If a user exceeds the disk quota while the NTFS volume is mounted by a Windows NT 4.0 Service Pack 4 or later system, and disk quotas are strictly enforced, all further disk allocations of data by that user using Windows XP Professional fail. The user can still read and write data to any existing file but cannot increase the size of a file. However, the user can delete and shrink files. When usage falls below the assigned disk quota, disk allocations of data can resume. Encryption Encrypted files cannot be accessed by computers that are running Windows NT 4.0 or earlier, so no cleanup operations are necessary. Sparse files Computers running Windows NT 4.0 or earlier cannot access sparse files, so no cleanup operations are necessary. Change journal Computers that are running Windows NT 4.0 or earlier do not log file changes in the change journal. When Windows XP Professional starts, the change journals on volumes accessed by Windows NT are reset to indicate that the journal history is incomplete. Applications that use the change journal must be able to accept incomplete journals. Object identifiers Windows XP Professional maintains two references to the object identifier: one on the file and one in the volume-wide object identifier index. If you delete a file that has an object identifier, Windows XP Professional must scan and clean up the entry in the index.