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Sample Value 0x80 Field Name and Definition Physical Drive Number. Related to the BIOS physical drive number. Floppy drives are identified as 0x00 and physical hard disks are identified as 0x80, regardless of the number of physical disk drives. Typically, this value is set prior to issuing an INT 13h BIOS call to specify the device to access. This value is relevant only if the device is a boot device. Reserved. FAT32 volumes are always set to zero. Extended Boot Signature. A field that must have the value 0x28 or 0x29 to be recognized by Windows XP Professional.

There are two other actions you can perform concerning cookies. If you are curious, you can open and read the information contained in any of the cookies Internet Explorer has stored. Just follow these steps:

Part V:

Sample Value 0xF19E5E5E Field Name and Definition Volume Serial Number. A random serial number that is created when a volume is formatted and that helps to distinguish between disks. Volume Label. A field that was once used to store the volume label. The volume label is now stored as a special file in the root directory. System ID. A text field with a value of FAT32.

0x47

1 In Internet Explorer, choose Tools, Internet Options. 2 On the General tab under Temporary Internet Files, click the Settings button. 3 In the Settings dialog box, shown in Figure 6-14, click the View Files button.

0x52

NTFS boot sector Table 28-16 describes the boot sector of a volume that is formatted with NTFS. When you format an NTFS volume, the format program allocates the first 16 sectors for the boot sector and the bootstrap code.

Field Length 3 bytes 8 bytes 25 bytes 48 bytes 426 bytes 2 bytes Field Name Jump instruction OEM ID BPB Extended BPB Bootstrap code End of sector marker

The View Files button shows you temporary Internet cookies, but there are also permanently stored cookies attached to your user profile. You can find them in the %UserProfile%\Cookies folder. By default the environment variable %UserProfile% will take you to the C:\Documents and Settings\Username folder, where Username is your Windows XP account name. If you open a Command Prompt window, switch to the drive on which Windows XP is installed (usually drive C), you can go directly to the Cookies folder by typing cd %UserProfile%\Cookies.

On NTFS volumes, the data fields that follow the BPB form an extended BPB. The data in these fields enables Ntldr to find the master file table (MFT) during startup. On NTFS volumes, the MFT is not located in a predefined sector, as on FAT16 and FAT32 volumes. For this reason, NTFS can move the MFT if there is a bad sector in the current location of the MFT. However, if the data is corrupted, the MFT cannot be located, and Windows XP Professional assumes that the volume has not been formatted. The following example illustrates the boot sector of an NTFS volume that is formatted by using Windows XP Professional. The printout is formatted in three sections:

6. You ll now verify that one of your foreign key constraints is working correctly. Open the Make table by right-clicking the Make table and selecting Show Table Data. 7. Let s try to delete the first row by clicking the leftmost field where the pencil usually appears. The row should be selected, and all the fields should be blue. Right-click, and select Delete. 8. A dialog box should appear inquiring whether you really want to delete the row. Click Yes. 9. You should receive the following dialog box error message stating that the row was not deleted because of the foreign key constraint: Error Message: The DELETE statement conflicted with the REFERENCE constraint FK_Listing_Make. This statement affirms why the foreign key constraint was created, which was to avoid orphaned rows. Figure 8-15 depicts what the error dialog box looks like and what kind of information is provided to help you debug the problem, Figure 8-15 if necessary. In this case, it s not Error dialog box showing the foreign key relationship preventing the a problem but a feature of your deletion of a row from the Make table creation!