Soft failure caused by certain settings or destroyed parameters,but the hard disk drive itself is no problem.
1. System file damage caused it can not be guided
If the hard disk does not install the operating system, or the operating system boot files have been damaged, then the hard drive will also unable to guide. How to determine the system boot process has been destroyed? Take a boot floppy or CD-ROM, guidance systems, if you could see the C, D, E … such a logical partition and the partition files of the hard drive in DOS mode, only proves to the guide procedures have been destroyed, this time you only need to re-install the operating system and is able to solve the problem.
2. The hard disk boot sector is damaged caused can not boot
hard disk is a magnetic media external storage devices, in its surface each disc to axis of rotation axis, the magnetic density of a certain interval was divided into a number of concentric tracks (Track), each track was again divided into several sectors (Sector), the data stored on hard disk sector
The first sector of the hard disk has been retained as master boot sector, which is located in the hard disk cylinder 0 track 0 sector 1, including the hard disk master boot record MBR (Main Boot Record) and partition table DPT (Disk Partition Table). The role of master boot record is to check the partition table which is correct and to determine which partition to boot partition, and the end of the process at the time of the partition boot program (that is, the operating system boot sector) transferred to the memory implementation. many people know the partition table is start from 80H, or 00H ,end to 55AAH, a total of 64 bytes, located at the end of this sector.
Because the master boot record is easy to write, hard disk master boot sector viruses often become the object of attack and thus has been tampered with or destroyed,when master boot record was destroyed,the system often appears “Non-System disk or disk error, replace disk and press a key to reboot”, “Error Loading Operating System” or “No ROM Basic, System Halted”, etc.There will not be any information in more serious cases.
If the system can not boot, and through the previous described methods can not solve the problem,you can determine the hard disk master boot sector have problems. Here are some common repair methods:
a. through the Fdisk repair the hard disk master boot record.
After boot the system With the boot disk,type “Fdisk / mbr” command and enter it. By” FDISK / mbr”parameter can overwrite the master boot record code area, but not to rebuild the primary partition table. Therefore, only applies to the case that master boot record was destroyed or boot sector virus code in master boot record is lost, but the primary partition table is not damaged.
Note: “Fdisk / mbr” command does not apply to removal of all lead-type virus, it should be used with caution.
b. Through the Fixmbr repair the hard disk master boot record.
Fixmbr tool designed to re-construct the main boot sector. The software only to modify the master boot record and not to write the other sectors, and the basic command format is as follows:
Fixmbrprivel [/ A] [/ D]
[/ Z] [/ 11]
/ A Active DOS partition / / activate the basic DOS partition
/ D Display MBR / / display the contents of master boot record
/ P Display partition / / show the structure of DOS Partition
/ Z Zero MBR / / Clear the Master Boot
/ H Help / / Help
Using the boot disk boot system, run Fixmbr, it checks the MBR structure, if found the system does not normally,it will prompt whetherto repair. If the answer is “Yes”, it searches the partition, when searched to the corresponding partition,the system will prompt whether to amend the MBR, to answer “Yes”,it will automaticall begin to repair. By default Fixmbr be able to search all existing partitions, and complete the modify operation. If you find that the final results are not correct, you can use “/ Z” parameters to clear results and re-start,then you can revert to the initial state.
Note: When the hard drive no boot error,you should not to abuse the tools to repair the boot sector,especially for some hard drive repair tools or software. If applied in a good hard drive, it may be some unexpected problems. Thus, less than a last resort, do not use such tools.
