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Running Chkntfs can help you identify volumes that have file system errors. If a volume is flagged as dirty, Windows XP Professional runs Chkdsk when the computer is restarted. You can, however, run Chkdsk immediately or postpone Chkdsk by using the Chkntfs command, although it is recommended that you run Chkdsk as soon as possible. To assess the damage without repairing the volume, you can run Chkdsk in read-only mode. For more information about using Chkdsk and Chkntfs, see 28, Troubleshooting Disks and File Systems.

13, Working with File Systems 28, Troubleshooting Disks and File Systems, for more information about troubleshooting problems related to disks and using Chkdsk and Disk Defragmenter 29, Troubleshooting the Startup Process, for more information about the startup process and Boot.ini 9, Managing Devices, for more information about the Device Manager snap-in and disconnecting Plug and Play storage devices Inside Microsoft Windows 2000, Third Edition by David A. Solomon and Mark E. Russinovich, 2000, Redmond: Microsoft Press.

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While you are offline, you can work with the file as you normally would. You can make any desired changes to it and save those changes. Like a local file, any changes you save are saved to the local, cached copy. While you are working offline, the icon shown here appears in the notification area. If you select the Display A Reminder option on the Offline Files tab of Folder Options, balloon messages will appear periodically reminding you that you are working offline.

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On readable/writable disks, Microsoft Windows XP Professional supports the NTFS file system and three file allocation table (FAT) file systems: FAT12, FAT16, and FAT32 On CD-ROM and DVD media, Windows XP Professional supports two file systems: Compact Disc File System (CDFS) and Universal Disk Format (UDF) When choosing a file system for readable/writable disks, you must consider the features associated with each file system You must also consider limitations, such as maximum volume size, cluster size, file size, and compatibility with other operating systems In this chapter: New in File Systems 512 Overview 513 Advantages of Using NTFS 514 Using the NTFS File System 522 Comparing FAT File Systems 569 Compact Disc File System 576 Universal Disk Format 577 Using File System Tools 578 File Naming in Windows XP Professional 579 Additional Resources 581.

For more information about boot sectors, defragmenting volumes, and using Chkdsk.exe, see 28, Troubleshooting Disks and File Systems. For more information about disks and volumes, see 12, Organizing Disks. For more information about system recovery, see Appendix C, Tools for Troubleshooting. For more information about sharing folders and shared folder permissions, see 6, Managing Files and Folders.

If you double-click the Offline Files icon in the notification area, you ll see the message shown in Figure 15-2. The Offline Files Status dialog box contains the Work Online Without Synchronizing Changes option. You might want to select this option if you re about to connect to the network but don t want to take the time to synchronize files before you can access the online network shares. This is useful when your local computer has a slow link to the network, when you want to conserve battery power, or when you want to connect to the network just long enough to retrieve the latest copy of a document.

Part II:

Windows XP Professional provides improved file system performance and features. Table 13-1 summarizes the enhancements made from Microsoft Windows 2000 to Windows XP Professional.

Table 13-1

Figure 15-2. The Offline Files Status dialog box informs you that you re working offline and lets you choose whether to synchronize when you reconnect to the network.

Description Some data structures on newly formatted NTFS volumes have been moved to a different location on the physical disk This new location improves performance from 5 to 8 percent, making NTFS performance similar to FAT If the volume is already formatted and you are sure the disk is not damaged, use this option during Setup to decrease the time necessary to format the volume The format command in Windows XP Professional now aligns FAT data clusters at the cluster size boundary This alignment improves the conversion of FAT volumes to NTFS because the convert command can now use a variable cluster size, up to a maximum of 4 kilobytes (KB), for converted volumes, instead of a fixed 512-byte cluster size as used in Windows 2000 Convertexe now applies default permissions on volumes converted to NTFS.