The main boot sector records the related information of the hard disk itself and the size and location information of each partition of the hard disk. If it is reconstructed, the basic data structure information on the hard disk will delete the reconstructed data structure information. The original data can be accessed again after reconstruction. The information in the main boot sector can be written by any partition software based on the operating system.
Extended data:
The master boot record is located in the first physical sector of the hard disk. Due to historical reasons, the size of a hard disk sector is 5 12 bytes, which contains at most 446 bytes of boot code, four hard disk partition entries (each entry is 16 bytes, ***64 bytes) and two signature bytes (0x55, 0xAA).
The master boot record consists of three parts: the boot program occupies the first 446 bytes (offset 0 ~ 1bdh), the last 64 bytes (offset 1beh ~ 1fdh) are DPT (hard disk partition table), and the last two bytes are "55 AA" (offset 65438).