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Boot Sectors on MBR Disks
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The boot sector, which is located at sector 1 of each volume, is a critical disk structure for starting your computer. It contains executable code and the data required by the code, including information that the file system uses to access the volume. The boot sector is created when you format a volume. At the end of the boot sector is a 2-byte structure called a signature word or end of sector marker, which is always set to 0x55AA. On computers running Windows XP Professional, the boot sector on the active partition loads into memory and starts Ntldr, which loads the boot menu if multiple versions of Windows are installed or loads the operating system if only one operating system is installed. A boot sector consists of the following elements:
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An x86-based CPU jump instruction The original equipment manufacturer identification (OEM ID) The BIOS parameter block (BPB), a data structure The extended BPB The executable boot code (or bootstrap code) that starts the operating system
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All Windows XP Professional boot sectors contain the preceding elements regardless of the type of disk (basic disk or dynamic disk).
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Note Disk editing tools such as DiskProbe and third-party tools that work with Windows NT 4.0 and NTFS might not support FAT32 boot sectors and volumes.
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The BPB describes the physical parameters of the volume: the extended BPB begins immediately after the BPB. Because of differing types of fields and the amount of data they contain, the length of the BPB is different for FAT16, FAT32, and NTFS boot sectors. Disk device drivers use the information in the BPB and the extended BPB to read and configure volumes. The area following the extended BPB typically contains executable boot code, which performs the actions necessary to continue the startup process. Boot sector startup processes Computers use the boot sector to run instructions during startup. The initial startup process is summarized in the following steps: 1. The system BIOS and the CPU initiate the power-on self test (POST). 2. The BIOS finds the boot device, which is typically the first disk the BIOS finds, unless the controller is configured to boot from a different disk. 3. The BIOS loads the first physical sector of the boot device into memory and transfers CPU execution to that memory address. If the boot device is on a hard disk, the BIOS loads the MBR. The master boot code in the MBR loads the boot sector of the active partition and transfers CPU execution to that memory address. On computers that are running Windows XP Professional, the executable boot code in the boot sector finds Ntldr, loads it into memory, and transfers execution to that file. Note Windows XP Professional cannot start up from a spanned or striped volume on dynamic disks. These disk structures cannot be registered into the MBR partition table; therefore, a system volume that uses these structures cannot start.
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If drive A contains a floppy disk, the system BIOS loads the first sector (the boot sector) of the disk into memory. If the disk is a startup disk (formatted by MS-DOS with core operating system files applied), the boot sector loads into memory and uses the executable boot code to transfer CPU execution to Io.sys, a core MS-DOS operating system file. If the floppy disk is not a startup disk, the executable boot code displays a message such as the following:
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Non-system disk or disk error. Replace and press any key when ready.
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Note
These messages do not appear on normally functioning systems that are configured to look for the startup files on drive C first. On many computers, an option in the CMOS setup program allows the user to set the sequence of installed disks that the system searches to find the startup files.
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