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On volumes with fewer than 32,680 sectors, the cluster sizes can be up to 8 sectors per cluster. In this circumstance, the format program creates a 12-bit FAT. Typically, volumes less than 16 MB in size are formatted for a 12-bit FAT, but the exact size depends on the disk geometry. The disk geometry also determines when a larger cluster size is needed because the number of clusters on the volume must fit into the number of bits used by the file system managing the volume. Therefore, you might have a 33-MB volume that has only 1 sector (512 bytes) per cluster. FAT12 is the original implementation of FAT and is intended for very small media. The file allocation table for FAT12 is smaller than the file allocation table for FAT16 and FAT32 because it uses less space for each entry, leaving more space for data. All 1.44-MB 3.5-inch floppy disks are formatted by using FAT12. Figure 13-17 illustrates how FAT16 maps clusters on a volume. The file allocation tables (labeled FAT1 and FAT2) identify each cluster in the volume as one of the following:

Figure 13-17

(continued)

The root folder has the maximum number of available entries fixed at 512. The maximum number of entries on a floppy disk depends on the size of the disk. Note Each folder and 8.3 file name in the root folder counts as an entry. For example, because the maximum number of entries is fixed at 512, if you have 100 folders in the root folder, you can create only 412 more files or folders in the root folder. If those folders or files use names longer than the 8.3 format, fewer files and folders can be created.

68 Microsoft Visual C# 2008 Express Edition: Build a Program Now!

Folders contain a 32-byte entry for each file and folder they contain. The entry includes the following information:

Name in 8.3 format (11 bytes) Attribute (1 byte, described later in this section)

16

13:

Create time (3 bytes) Create date (2 bytes) Last access date (2 bytes) Last modified time (2 bytes) Last modified date (2 bytes) Starting cluster number in the file allocation table (2 bytes) File size (4 bytes)

Troubleshooting (continued) To remedy this situation, make sure that Remote Desktop has been enabled on the remote computer, and then check that the user account that couldn t complete the remote connection has an administrator account on the computer or has been added to the Remote Desktop Users group. Next, from the client computer, if you re using a computer name to access the remote computer, make sure that the computer name can be resolved by DNS. If you re using an IP address, make sure you can reach that IP address from the client computer, and that no firewalls are blocking Remote Desktop between the client computer and the Remote Desktop host.

In the file allocation table of a FAT16 volume, files are given the first available location on the volume. The starting cluster number is the address of the first cluster used by the file. Each cluster contains a pointer to the next cluster in the file, or an end-of-file indicator at (0xFFFF), which indicates that this cluster is the end of the file. These pointers and end-of-file indicators are shown in Figure 13-18.

Figure 13-18

Figure 13-18 shows three files in a folder. File1.txt uses three clusters. File2.txt is a fragmented file that requires three clusters. File3.txt fits in one cluster. In each case, the file allocation table entry points to the first cluster of the file. The information in the folder is used by all operating systems that support FAT. Windows XP Professional can store additional timestamps in a FAT folder entry. These timestamps show when the file was created or last accessed. The attribute byte for each entry in a folder describes what kind of entry it is. For example, one bit indicates that the entry is for a subfolder, and another bit marks the entry as a volume. Typically, the operating system controls the settings of these bits. The attribute byte includes four bits that can be turned on or off by the user: archive, system, hidden, and read-only.

If you routinely use Remote Desktop to connect to a remote computer, you can save yourself a bit of effort in the logon process by configuring Remote Desktop to log you on automatically. For example, you might want to do this if you typically use your home computer in the evening to log on to your office computer and check e-mail. To configure the automatic logon option, follow these steps:

Part II:

The FAT32 on-disk format and features on Windows XP Professional are similar to those on Windows 95 OSR2, Windows 98, and Windows Me. The size of a FAT32 cluster is determined by the system and can range in size from 1 sector (512 bytes) to 128 sectors (64 KB), incremented in powers of 2. Note

Using 64-KB clusters in FAT32 can lead to compatibility problems with certain programs. The maximum cluster size recommended for a FAT32 volume is 32 KB.