10 Hard Drive Problem Solutions

Dec. 14, 2010 - PRLog -- First, the system does not recognize hard drive

The system can not boot from the hard drive, boot from the A drive can not access C drive, the use of CMOS in the automatic monitoring function can not be found in the presence of the hard disk. Most of these failures appear in the connection cable or IDE ports, hard disk failure is unlikely in itself, can change to re-plug cable or IDE hard drive and cables were replaced by oral test, you will soon find fault lies. If the new hard drive is not connected to be accepted, a common reason for this is the master and slave jumpers on the hard disk, if you pick two disks on one IDE hard disk drives, it is necessary to distinguish between master and slave.

Second, CMOS failure caused by

CMOS drive type in the correct or not directly affect the normal use of the hard disk. Machines are now supported "IDE Auto Detect" feature that 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 happen to read and write errors. Such as hard drive type in CMOS is less than the actual hard disk capacity, the hard drive behind the sector will not be able to read and write, if it is a state of the individual multi-partition partition will be lost. There is also a major cause of the malfunction, the current logical arguments support the type of IDE hard disk can be "Normal, LBA, Large", etc., if the normal mode, install the data, but in the CMOS, changed the pattern of other will read and write errors hard failure occurs, because the mapping has changed, and will not be able to read the original location of the correct hard drive.

Third, the master boot program startup failure caused by

Master boot program located in the hard disk master boot sector, mainly for testing the correctness of the hard disk partition, and to determine the active partition, is responsible for handing over to the active partition to boot the DOS or other operating systems. This section will not damage the program from the hard disk boot, but the floppy or hard disk drive starts to read and write. Way to fix this fault is more simple version of DOS's FDISK using high most convenient, as with the parameters / mbr run, will directly replace (override) the 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 drive containing the master boot program. Although the updated version of DOS, but the hard disk master boot program has not changed from DOS 3.x to Windos 95 of the DOS, as long as find a DOS boot disk boot system and run this program can repair.

Fourth, partition table error caused boot failure

Hard disk partition table errors are serious errors, different error result in different levels of loss. If there is no active partition flag, the computer will not start. However, the boot floppy or CD-ROM drive can read and write after the system, reset the active partition by FDISK to repair.

If it is a partition type error, can cause the loss of a partition. The fourth partition table partition type byte value is greater than the normal 32MB bootable DOS partition is the basic 06, the extended DOS partition value is 05. Many people use the value of this type of encryption technology to achieve a single partition, restore the original value of the correct type can make the partition back to normal.

There are other data in the partition table to record the start or end address of partition. These data will result in damage or loss of the confusion of the Division, the available method is to use the backup data to re-write the partition table back, or from other conditions the same type and the same partition on the hard disk partition table to get the data.

Fifth, the failure partition effectively mark error

In the hard disk master boot sector there is also an important part, that is, the last two bytes: "55aa", this byte sector effective flag. When from the hard disk, floppy disk or CD-ROM starts, will detect these two bytes are considered hard if there exists, or it will not recognize the hard drive. Here for the entire hard drive encryption technology, the method can be used DEBUG recovery process. In addition, when the DOS boot sector, no boot logo, the system starts to appear as: "Mmissing Operating System". Convenient way is to use the DOS system, the following general fixes.

VI, DOS boot failure due to start

DOS boot from the DOS boot sector and the main DOS system files. Including system files IO.SYS, MSDOS.SYS, COMMAND.COM, which is a DOS shell COMMAND.COM file, the file can be replaced by other similar, but the default state is essential DOS boot files. DOS in Windows 95 systems carry, MSDOS.SYS is a text file, is to start Windows to the file, but can only do this when you start the DOS file. DOS boot error, you can boot from a floppy disk or CD-ROM after using SYS C: command delivery system, you can fix problems, including the boot sector and system files can be automatically restored to normal.

VII, FAT table to read and write due to failure

FAT table records the address of data storage drives, each file has a FAT chain, store cluster specified address. FAT table corruption means that the contents of the file is missing. Fortunately DOS FAT system itself provides two tables, if you are currently using FAT table is corrupt, can be used to cover the second repair. However, due to different specifications of the disk of its FAT table and the second FAT table length of the address is not fixed, so the repair must be properly find its correct position, a number of tools and other software, such as NU itself has such a repair, the use of very convenience. DEBUG can also be used to achieve this operation, that is, using the m command of the second FAT table can be moved at the first table. If the second FAT table is also damaged, you can not put the hard disk back to its original state, but the file's data is still stored in the hard disk data area, or SCANDISK CHKDSK command can be used to repair, and ultimately get *. CHK files, This is the missing FAT chain sector data. If it is a text file can be extracted from the full or partial content of the document.

VIII Table of damage caused by lead failure

Table of records in the name of the file the hard disk and other data, the most important of which is the starting cluster number of the document. Table of the absence of automatic backup feature, so the damage will be lost if the directory number of files. A method is also used to reduce the loss of SCANDISK program CHKDSK or recovery method, search the hard disk *. CHK files, the table of contents damage is only missing the first cluster number, each *.. CHK file that is a complete file, its name can be restored to most of the original file.

Nine, accidentally deleted partition data recovery

When using FDISK to delete the partition, the surface is the hard disk data has completely disappeared, without formatting the hard disk into the drive appears to be invalid. If you understand the working principle of FDISK, you will know that FDISK the hard drive just to rewrite the master boot sector (sector 1 0 0 plane) in the content, specifically, is to remove the hard disk partition table information, and any hard disk partition The data are not changed. Can be modeled on the above fix partition table errors, which try to restore the data to restore the original partition table partition and data. If you have formatted the partition, restore partition earlier, according to the following methods of data recovery partition.

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