根据前面的MBR中包含的4个分区表中的一个分区表的信息，对应的结构体为：
struct MBRpartition {
unsigned char boot_ind; /* 0x80 - active */
unsigned char head; /* starting head */
unsigned char sector; /* starting sector */
unsigned char cyl; /* starting cylinder */
unsigned char sys_ind; /* What partition type */
unsigned char end_head; /* end head */
unsigned char end_sector; /* end sector */
unsigned char end_cyl; /* end cylinder */
unsigned char start4[4]; /* starting sector counting from 0 */
unsigned char size4[4]; /* nr of sectors in partition */
};
以上的结构中，当boot_ind为0x80的时候，表示此分区是已经进行了初始化的，通俗地讲，也即是进行了分区的建立并进行了
格式化的。
而sys_ind此值表示当前分区的类型，例如：在windows下一般都有Fat16,Fat32,NTFS,ExFat等，而在GNU Linux中有
ext2,ext3,ext4等文件系统，若是扩展分区，那么则为0x05。
分区的类型对应的值为：
switch(type)
{
case 0x06: return "FAT16";
case 0x07: return "NTFS";
case 0x0b: return "FAT32";
case 0x0c: return "FAT32";
case 0x0f: return "Extended";
case 0x82: return "Linux Swap/Solaris";
case 0x83: return "EXT2fs/EXT3fs";
case 0x8e: return "Linux LVM";
case 0x00: return "empty";
case 0x01: return "DOS 12-bit FAT";
case 0x04: return "DOS 16-bit FAT";
case 0x05: return "Extended";
case 0x85: return "Linux Extended";
case 0xfd: return "Linux Raid";
case 0x02: return "XENIX root";
case 0x03: return "XENIX /usr";
case 0x08: return "AIX bootable";
case 0x09: return "AIX data";
case 0x0A: return "OS/2 Boot Manager";
case 0x10: return "OPUS";
case 0x11: return "OS/2 Boot Manager hidden 12-bit FAT";
case 0x12: return "Compaq Diagnostics";
case 0x14: return "OS/2 Boot Manager hidden sub-32M 16-bit FAT";
case 0x16: return "OS/2 Boot Manager hidden over-32M 16-bit FAT";
case 0x17: return "OS/2 Boot Manager hidden HPFS";
case 0x18: return "AST special Windows swap";
case 0x24: return "NEC MS-DOS";
case 0x3C: return "PowerQuest PartitionMagic recovery partition";
case 0x40: return "VENIX 80286";
case 0x42: return "SFS (Secure File System)";
case 0x50: return "Disk Manager (ro)";
case 0x51: return "Novell";
case 0x52: return "Microport System V/386";
case 0x56: return "GoldenBow VFeature";
case 0x61: return "SpeedStor";
case 0x63: return "GNU HURD";
case 0x64: return "Novell NetWare";
case 0x65: return "Novell NetWare";
case 0x70: return "DiskSecure Multi-Boot";
case 0x75: return "PC/IX";
case 0x80: return "Minix";
case 0x81: return "Minix";
case 0x84: return "OS/2-hidden";
case 0x93: return "Amoeba";
case 0x94: return "Amoeba bad";
case 0xA5: return "FreeBSD";
case 0xB7: return "BSDI";
case 0xB8: return "BSDI swap ";
case 0xC1: return "DR-DOS 6.0 LOGIN.EXE-secured 12-bit FAT";
case 0xC4: return "DR-DOS 6.0 LOGIN.EXE-secured 16-bit";
case 0xC6: return "DR-DOS 6.0 LOGIN.EXE-secured Huge";
case 0xC7: return "Cyrnix Boot";
case 0xDB: return "CP/M";
case 0xE1: return "SpeedStor 12-bit FAT extended";
case 0xE4: return "SpeedStor 16-bit FAT extended";
case 0xF2: return "DOS 3.3+ secondary";
case 0xF4: return "SpeedStor";
case 0xFE: return "LANstep";
case 0xFF: return "bad";
}