asp.net data matrix reader

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Field Length 2 bytes 4 bytes 4 bytes 4 bytes 8 bytes 8 bytes 8 bytes Sample Value 0xFF00 0x3F000000 0x00000000 0x80008000 0x1C9111010 0000000 0x000004000 0000000 0x111911000 0000000 0xF6 Field Name and Definition Not used or checked by NTFS. Not used or checked by NTFS. The value must be 0 or NTFS fails to mount the volume. Not used or checked by NTFS. Total Sectors. The total number of sectors on the hard disk. Logical Cluster Number for the File $MFT. Identifies the location of the MFT by using its logical cluster number. Logical Cluster Number for the File $MFTMirr. Identifies the location of the mirrored copy of the MFT by using its logical cluster number. Clusters Per MFT Record. The size of each record. NTFS creates a file record for each file and a folder record for each folder that is created on an NTFS volume. Files and folders smaller than this size are contained within the MFT. If this number is positive (up to 0x7F), it represents clusters per MFT record. If the number is negative (0x80 to 0xFF), the size of the file record is 2 raised to the absolute value of this number. Not used by NTFS. Clusters Per Index Buffer. The size of each index buffer, which is used to allocate space for directories. If this number is positive (up to 0x7F), it represents clusters per MFT record. If the number is negative (0x80 to 0xFF), the size of the file record is 2 raised to the absolute value of this number. Not used by NTFS. Volume Serial Number. The volume s serial number. Not used by NTFS.

0x40

6

Protecting the boot sector Because a functioning system relies on the boot sector to access a volume, run Chkdsk when needed and back up all your data files regularly to protect against data loss if you lose access to a volume. For more information about Chkdsk, see Chkdsk earlier in this chapter. For more information about repairing boot sectors, see Replacing the Boot Sector earlier in this chapter.

28:

GPT uses primary and backup partition structures to provide redundancy. These structures are located at the beginning and end of the disk. GPT identifies these structures by their logical block address (LBA) rather than by their relative sectors. Using this scheme, sectors on a disk are numbered from 0 to n-1, where n is the number of sectors on the disk. As shown in Figure 28-8, the first structure on a GPT disk is the Protective MBR in LBA 0, followed by the primary GUID partition table (GPT) header in LBA 1. The GPT header is followed by the primary GUID partition entry array, which includes a partition entry for each partition on the disk. Partitions on the disk are located between the primary and backup GUID partition entry arrays. The partitions must be placed within the first usable and last usable LBAs, as specified in the GPT partition header.

Figure 6-15.

Protective MBR Primary GUID Partition Table Header GUID Partition Entry 1 GUID Partition Entry 2 Primary GUID partition entry array LBA 2-LBA 33 GUID Partition Entry... GUID Partition Entry 128 Partition 1 Partition 2 LBA 0 LBA 1

Partition n GUID Partition Entry 1 GUID Partition Entry 2 Backup GUID partition entry array GUID Partition Entry... GUID Partition Entry 128 Backup GUID Partition Table Header LBA n

Figure 28-8

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10. Click OK to exit this dialog box. 11. Test your other constraints related to the Listing table by trying to delete the first row of the CarType table. You should receive the same error message. Now that you have all your domain tables loaded with some data, you ll learn to use the database in a Windows Forms application. You ll learn about ADO.NET and about data bindings with Windows Forms controls.

Part V:

The Extensible Firmware Interface (EFI) specification that defines the GPT disk specification requires that LBA 0 be reserved for compatibility code and a Protective MBR. The Protective MBR has the same format as an existing MBR, and it contains one partition entry with a System ID value of 0xEE. This entry reserves the entire space of the disk, including the space used by the GPT header, as a single partition. The Protective MBR is included to prevent disk utilities that were designed for MBR disks from interpreting the disk as having available space and overwriting GPT partitions. The Protective MBR is ignored by EFI; no MBR code is executed. The following example shows a partial printout of a Protective MBR: