Common Troubleshooting hard drive

System does not recognize hard drive

The system can not boot from the hard drive from the A disk can not boot into the C drive, use the CMOS the automatic monitoring function can not be found in the presence of the hard disk. Most of these failures appear in the connecting cable or IDE port on the hard disk failure is unlikely in itself and can be re-plug hard drive cable or change IDE port and cable to replace the test, you'll quickly find fault lies. If the new hard drive is not connected to be accepted, a common reason is the master-slave jumpers on the hard disk, if an IDE hard disk online access two hard disk drives, it is necessary to distinguish the relationship between master and slave.

CMOS failure caused by

CMOS in the hard disk drive a direct impact on whether or not the correct type of normal use. The machines are now supported "IDE Auto Detect" function can automatically detect the hard disk type. When the hard disk type error, and sometimes simply can not start the system, and sometimes be able to start, but it will read and write error occurred. Such as CMOS, the type of hard drive is less than the actual hard disk capacity, then the hard drive behind the sector will not be able to read and write, if it is multi-regional state of the individual partitions will be lost. There is also a major cause of the malfunction, since the current logical arguments support the type of IDE hard disk can be used "Normal, LBA, Large", etc., if the normal mode, installed the data, but in the CMOS, replaced by other models , the hard drive read and write errors occur failure, because the mapping relationship has changed, and will not be able to read the original location of the correct hard drive.

Master boot program is causing the boot failure

Master boot program is located in the hard disk master boot sector, mainly used to test the correctness of the hard disk partitions, and to determine active partition, is responsible for guiding the activities of the right to be transferred to the DOS partition or other operating systems. This section will be unable to process damaged boot from the hard drive, but boot floppy or CD-ROM drive can read and write later. Ways to fix this fault is more simple, the use of high version of the DOS-FDISK the most convenient, as with parameters / mbr run-time will have a direct replacement (rewritable) hard disk master boot program. In fact the hard disk master boot sector is the establishment of this program, FDISK.EXE being a complete hard disk that contains the master boot program. While the DOS version of the constantly updated, but the hard disk master boot process has not changed from DOS 3.x to Windos 95 of the DOS, as long as to find a DOS boot disk to start the system and run this program can be repaired.

The partition table errors caused by failure to start

The hard disk partition table errors are serious errors, different errors might lead to different types of losses. If there is no active partition flag, then the computer does not start. However, after the boot floppy or CD-ROM drive can read and write, reset the active partition by FDISK to repair it.
If it is a partition type of error could result in the loss of a partition. The fourth partition table for the partition type byte value, the normal bootable DOS partition larger than 32MB of the basic value of 06, while the extended DOS partition value is 05. Many people take advantage of this type of value is to achieve a single partition encryption technology to restore the original values of the right type can make the partition back to normal.
There are other data in the partition table used to record the start or termination of the address partitions. These data will cause damage to the partition confusion or loss of, the available method is to use the backup partition table data to re-write back, or from other conditions the same type and the same partition on the hard disk partition table to obtain the data.
NU recovery tools such as software tools can be used, the operation very convenient. Of course, DEBUG can be used to operate, but the operation cumbersome and has certain risks.