subsequent, identically structured partition records. Finally, the hexadecimal signature 55AA completes a valid Master Boot Record 硬盘的主引导记录在硬盘的0磁头0柱面1扇区 主引导记录由三部分组成 (1)主引导程序 (2)四个分区表 (3)主引导记录有效标志字 详见表1。 [表1主引导记录结构] 0000H-00D9H主引导记录代码区 00DAH一01BDH空闲区 01BEH-01CDH分区1结构信息 01CEH-01DDH分区2结构信息 01DEH-01EDH分区3结构信息 0EEH一0FDH分区4结构信息 01FEH_01FFH55AH主引导记录有效标志 说明: A,分区表自偏移1BEH处开始,分区表共64个字节,表中可填入四个分区信息,每十六个字节为一个 分区说明项,这16个字节含义详见表2。 B,必须注意:扇区号的高二位占用柱面号所在字节的最高二位,即柱面号为10位,扇区号6位 The format of a partition record is as follows Offset Size description 0 8 bit a value of 80 designates an active partition 1 8 bit partition start head 2 8 bit Partition start sector(bits 0-5) 3 8 bit Partition start track (bits 8, 9 in bits 6, 7 of sector 4 8 bit Operating system indicator 5 8 bit Partition end head 6 8 bit Partition end sector (bits 0-5) 7 8 bit Partition end track(bits 8, 9 in bits 6, 7 of sector) 8 32 bit Sectors preceding partition c 32 bit Length of partition in sectors Operating system indicators:(hexadecimal, incomplete list) 00 Empty partition-table entry 01 DOS FAT12 4 DOS FAT16(up to 32 MB) 05 DOS 3. 3+ extended partit 06 DOS 3. 31+ FAT16(over 32 MB) 07 0S/2 HPFS, Windows NT NTFS, Advanced Unixsubsequent, identically structured partition records. Finally, the hexadecimal signature 55AA completes a valid Master Boot Record. 硬盘的主引导记录在硬盘的0磁头0柱面1扇区。 主引导记录由三部分组成： (1)主引导程序； (2)四个分区表； (3)主引导记录有效标志字。 详见表1。 [表1主引导记录结构] 位 置 内 容 0000H －00D9H 主引导记录代码区 00DAH －01BDH 空闲区 01BEH －01CDH 分区1结构信息 01CEH －01DDH 分区2结构信息 01DEH －01EDH 分区3结构信息 01EEH －01FDH 分区4结构信息 01FEH －01FFH 55 AAH 主 引 导 记 录 有 效 标 志 说明: A,分区表自偏移1BEH处开始，分区表共64个字节，表中可填入四个分区信息，每十六个字节为一个 分区说明项，这16个字节含义详见表2。 B,必须注意：扇区号的高二位占用柱面号所在字节的最高二位，即柱面号为10位，扇区号6位。 The format of a partition record is as follows: Offset Size Description 0 8 bit A value of 80 designates an active partition. 1 8 bit Partition start head 2 8 bit Partition start sector (bits 0-5) 3 8 bit Partition start track (bits 8,9 in bits 6,7 o f sector) 4 8 bit Operating system indicator 5 8 bit Partition end head 6 8 bit Partition end sector (bits 0-5) 7 8 bit Partition end track (bits 8,9 in bits 6,7 of sector) 8 32 bit Sectors preceding partition C 32 bit Length of partition in sectors Operating system indicators: (hexadecimal, incomplete list) 00 Empty partition-table entry 01 DOS FAT12 04 DOS FAT16 (up to 32 MB) 05 DOS 3.3+ extended partition 06 DOS 3.31+ FAT16 (over 32 MB) 07 OS/2 HPFS, Windows NT NTFS, Advanced Unix