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Another source of disk problems can be cabling and connectors. Cables can become defective, but if the cable works initially, it is likely to work for a long time. When new disks are added to the computer, check for cabling problems. New problems might stem from a previously unused connector on an existing cable or from a faulty, longer cable used to connect all the disks that might have replaced the working original. Also check the connections to the disk themselves. If the cables are tightly stretched, one or more connectors might work themselves loose over time, resulting in intermittent problems with the disks. If your system has small computer system interface (SCSI) adapters, contact the manufacturer for updated Windows XP Professional drivers. Try disabling sync negotiation in the SCSI BIOS, checking the SCSI identifiers of each device, and confirming proper termination. For AT Attachment devices, define the onboard IDE port as Primary only. Also, check each ATA device for the proper master, slave, or stand-alone setting. Try removing all ATA devices except for hard disks. For universal serial bus and IEEE 1394 disks, verify that the cables are correctly connected and that the adapter card, if used, is securely seated. To make sure that any new disks and disk controllers are supported, see the Windows Catalog at http://www.microsoft.com/windows/catalog.
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Disk Sectors Critical to Startup
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A sector is a unit of storage on a hard disk and is typically 512 bytes. Computers access certain sectors on a hard disk during startup to determine which operating system to start and where the partitions are located. The data stored on these sectors varies depending on the computer platform. Computers that are x86-based begin the startup process from disks that contain a master boot record and are referred to as MBR disks. 64-bit computers start up from disks that contain a GUID partition table and are referred to as GPT disks. MBR and GPT disks each have disk sectors critical to startup, but the differences in the sectors are not visible in the graphical user interface. Instead, you must use a disk-editing tool, such as DiskProbe, to see how the data on these sectors is structured. For more information about using DiskProbe, see DiskProbe earlier in this chapter.
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Part V:
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The ability to edit and repair these sectors on a byte-by-byte basis after corruption has occurred is invaluable, but using a disk-editing tool requires a thorough understanding of how data is organized on the sectors. If you make a mistake, you can damage or permanently overwrite critical on-disk data structures that might make all data on a disk or volume permanently inaccessible. Therefore, it is a good idea to use the information in this chapter to learn about the sectors used for startup, and then to examine the sectors on your own disks to further your learning.
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Disk Sectors on MBR Disks
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The two sectors critical to starting x86-based computers are the following:
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The master boot record (MBR), which is always located at sector 1 of cylinder 0, head 0, the first sector of a hard disk. The boot sector, which resides at sector 1 of each volume.
These sectors contain both executable code and the data required to run the code.
Master Boot Record on Basic Disks
The MBR, the most important data structure on the disk, is created when the disk is partitioned. The MBR contains a small amount of executable code called the master boot code, the disk signature, and the partition table for the disk. At the end of the MBR is a 2-byte structure called a signature word or end of sector marker, which is always set to 0x55AA. A signature word also marks the end of an extended boot record (EBR) and the boot sector. The disk signature, a unique number at offset 0x01B8, identifies the disk to the operating system. Windows XP Professional uses the disk signature as an index to store and retrieve disk information, such as drive letters, in the registry. Master boot code The master boot code performs the following activities:
1. Scans the partition table for the active partition. 2. Finds the starting sector of the active partition. 3. Loads a copy of the boot sector from the active partition into memory. 4. Transfers control to the executable code in the boot sector. If the master boot code cannot complete these functions, the system displays a message similar to one of the following:
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