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Troubleshooting the Startup Process
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When more than one operating system is installed on a computer, a startup menu appears that is similar to the one shown in Figure 29-4.
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Figure 29-4
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Example of a startup menu for multiple-boot systems
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If only one operating system is installed, Ntldr does not display a startup menu. Instead, the system starts immediately.
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The Boot.ini file uses the Advanced RISC Computing (ARC) naming convention to define the path to a Windows XP Professional installation. If the contents of the Boot.ini are incorrectly changed or the file becomes corrupt, you might not be able to start Windows XP Professional. To detect and correct Boot.ini problems, you need to understand ARC paths. ARC paths use the following formats:
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multi(W)disk(X)rdisk(Y)partition(Z)\systemroot="Description" scsi(W)disk(X)rdisk(Y)partition(Z)\systemroot="Description" signature(V)disk(X)rdisk(Y)partition(Z)\systemroot="Description"
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Windows XP Professional can use any of the preceding formats to locate the systemroot directory. Multi() Syntax The multi() syntax instructs Windows XP Professional to rely on system BIOS calls to load system files. To achieve this, Ntldr uses interrupt 13 (also called INT-13) firmware instructions to locate Ntoskrnl.exe and other systemroot files needed to start Windows XP Professional. The multi() Boot.ini syntax is used for all controllers that provide INT13 support for ATA and SCSI disks. Table 29-10 describes the multi() parameters, which follow this syntax:
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multi(W)disk(X)rdisk(Y)partition(Z)
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Part V:
System Troubleshooting
Table 29-10 describes the multi() parameters.
Table 29-10 Parameter W X Y
Multi() Parameters
Multi() Parameter Descriptions Specifies the drive controller number (also known as the ordinal number), typically 0. The first valid number is 0. This value is always 0 when the multi() syntax is used. Specifies a physical hard disk attached to drive controller W. For ATA controllers, this number is typically between 0 and 3. For SCSI controllers, this number is typically between 0 and 7, or 0 and 15, depending on the adapter type. The first valid number is 0. Specifies the partition number on the physical disk specified by parameter Y, attached to the controller specified by parameter W. All partitions in use are assigned a number. The first valid number is 1.
SCSI() Syntax The scsi() syntax informs Windows XP Professional that the startup SCSI controller does not support INT-13 calls and that a device driver, Ntbootdd.sys, is needed to access files on the boot partition. The scsi() parameters follow this format:
scsi(W)disk(X)rdisk(Y)partition(Z)
Table 29-11 describes the SCSI() parameters.
Table 29-11 Parameter W X
SCSI() Parameters
SCSI() Parameter Descriptions Specifies the drive controller number (also known as the ordinal number), typically 0. The first valid number is 0. Specifies a physical hard disk attached to drive controller W. For SCSI controllers, this number is typically between 0 and 7, or 0 and 15, depending on the adapter type. The first valid number is 0. Specifies the SCSI logical unit number (LUN) of the disk that contains the boot partition. This value is typically 0 when the scsi() syntax is used. Specifies the partition number on the physical disk specified by parameter Y, attached to the controller specified by parameter W. All partitions in use are assigned a number. The first valid number is 1.
Signature() Syntax The signature() syntax shares similarities with the scsi() syntax and was implemented to support Plug and Play scenarios where you install additional drive controllers to your system. Windows XP Professional Setup determines whether to use the signature() syntax during installation. The signature() syntax is valid for systems equipped with either ATA or SCSI hard disks. The signature() parameters follow this syntax:
signature(V)disk(X)rdisk(Y)partition(Z)
29:
Troubleshooting the Startup Process
The signature() syntax instructs Ntldr to locate the disk with the signature that matches the first value in parentheses, regardless of the controller number associated with the disk. A disk signature is a globally unique identifier (GUID) that is extracted from information in the MBR and written to the disk during the text-mode portion of Windows XP Professional Setup or during previous Windows 2000 and Windows XP Professional installations. This 128-bit hexadecimal number uniquely identifies the disk. If you see the signature() syntax used in the Boot.ini file, it means that Ntbootdd.sys is required to access the boot partition and one or both of the following conditions exist:
You installed Windows XP Professional to a hard disk partition larger than 7.8 gigabytes (GB) in size, the ending cylinder number is higher than 1024 for that partition, and the system firmware or startup controller BIOS cannot gain access by using extended INT13 calls. The hard disk controller BIOS does not support extended INT-13 calls, or you have set this option to disabled by using the adapter s built-in setup utility. When Windows XP Professional is unable to use INT-13 BIOS calls during the startup process, the file Ntbootdd.sys is required to access the boot partition.
Whenever possible, configure your storage controller to use INT-13 BIOS calls. Consult the documentation for the storage adapter to determine the correct hardware settings. Table 29-12 describes the signature() parameters.
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