The first self-made repair method:
This problem is caused by improper operation of MBR (Master Boot Record) of hard disk. ) damaged.
In order to facilitate understanding, MBR is generally divided into broad sense and narrow sense: the broad sense MBR includes the whole sector (boot program, partition table and partition identifier), that is, the master boot record mentioned above; In a narrow sense, MBR only refers to the boot program.
The second general repair method, the process is good, but more complicated. Suitable for tossing people:
The main boot sector of hard disk (0 cylinder 0 head 1 sector) consists of three parts: the main boot record, the partition table and the valid flag. It is very important for system bootstrapping, and it is also the favorite target of some viruses. In the past, we mostly viewed and modified it through the export function of special software such as KV3000 or Norton, but now it can be easily realized through the disk detection tool Dskprobe that comes with Windows XP.
Partition table view:
The partition table specifies how many partitions there are in the system, as well as important information such as the start and end sectors, the size of each partition, and whether it is an active partition. After reading the main boot sector, Dskprobe can view the partition table code in 16 in the main interface, which consists of four entries, each of which occupies 16 bytes.