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Windows XP Professional does not generate short (8.3) file names for files created by POSIXbased applications on an NTFS volume whether short file names are disabled or not. This means that MS-DOS-based and 16-bit Windows-based applications cannot view these file names if they are not valid 8.3 file names. Therefore, you must use standard MS-DOS 8.3 naming conventions if you want to use MS-DOS-based or 16-bit Windows-based applications to work with files that are created by POSIX applications.

The FAT file system locates the file allocation table near the beginning of the volume. FAT16 works best on small disks with simple folder structures. FAT32 works well on large disks with complex folder structures. Both FAT file systems store two copies of the file allocation table on the volume. If one copy of the file allocation table is corrupted, the other is used. The location of the file allocation table is specified in the FAT boot sector s BIOS Parameter Block (BPB). For more information about the FAT boot sectors, see 28, Troubleshooting Disks and File Systems. Note

Part II:

Figure 16-4. When you attempt to log on, you see a message telling you that another user is logged on. Click Yes to continue.

The numerals in the names FAT12, FAT16, and FAT32 refer to the number of bits required for a file allocation table entry as follows:

FAT12 uses a 12-bit file allocation table entry (212 clusters). FAT16 uses a 16-bit file allocation table entry (216 clusters). FAT32 uses a 32-bit file allocation table entry. However, FAT32 reserves the first 4 bits of a FAT32 file allocation table entry, which means FAT32 has a theoretical maximum of 228 clusters.

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In Windows XP Professional, FAT12 is used only on floppy disks and on volumes smaller than 16 megabytes.

Figure 16-5. A user logged on at the remote computer sees this message, which lets that person decide whether you can log on. G If Fast User Switching is not enabled on the remote computer, things do

Advantages of FAT16 include:

MS-DOS, Windows 95, Windows 98, Windows Me, Windows NT, Windows 2000, Windows Server 2003, Windows XP, and some UNIX operating systems can use FAT16. Many older software tools can address problems and recover data on FAT16 volumes. If you have a startup failure, start the computer by using an MS-DOS bootable floppy disk to troubleshoot the problem. FAT16 is efficient, in speed and storage, on volumes smaller than 256 MB.

16

Disadvantages of FAT16 include:

The root folder can contain a maximum of 512 entries. The use of long file names can significantly reduce the number of available entries. FAT16 is limited to 65,536 clusters, but because certain clusters are reserved, it has a practical limit of 65,524. Therefore, the largest FAT16 volume on Windows XP Professional is limited to just under 4 GB and uses a cluster size of 64 KB. To maintain compatibility with MS-DOS, Windows 95, Windows 98, and Windows Me, a FAT16 volume cannot be larger than 2 GB. FAT16 is inefficient on larger volume sizes because the cluster size is much larger when compared to NTFS and FAT32 cluster sizes. For example, a 10-KB file stored on a 1.2-GB FAT16 volume, which uses a 32-KB cluster, wastes 22 KB of disk space. FAT32 and NTFS use 4-KB and 2-KB clusters, respectively, for a 1.2-GB volume.

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not work as nicely. Figure 16-6 shows that you have the option of forcefully ending the user s session without even giving the user an opportunity to save any open files.

The boot sector, a critical disk structure for starting your computer, is not backed up. FAT16 has no built-in file system security or compression scheme.

FAT32 has the following enhancements:

The root folder on a FAT32 volume is an ordinary cluster chain and can be located anywhere on the volume. For this reason, FAT32 does not restrict the number of entries in the root folder. FAT32 uses smaller clusters (4 KB for volumes up to 8 GB), so it allocates disk space more efficiently than FAT16. Depending on the size of your files, FAT32 creates the potential for tens and even hundreds of megabytes of additional free disk space on larger volumes compared to FAT16. The boot sector is backed up at a specified location on the volume, so FAT32 volumes are less susceptible to single points of failure than FAT16 volumes.