Common Troubleshooting hard drive-2

Fault Zoning active flag errors

In the hard disk master boot sector there are still an important part, that is its last two bytes: "55aa", the bytes of a valid symbol for the sector. When from the hard disk, floppy disk or CD-ROM starts, will detect these two bytes, if there is the view that there is a hard drive, otherwise it would not recognize the hard disk. Here can be used for the entire hard drive encryption technology DEBUG method can be used to resume processing. In addition, when the DOS boot sector not leading marks, the system starts will appear as: "Mmissing Operating System". Convenient method is to use the following DOS system, a common repair method.

DOS boot boot failures caused by

DOS boot system is mainly from the DOS boot sector and the DOS system files. System files include IO.SYS, MSDOS.SYS, COMMAND.COM, which is a DOS shell COMMAND.COM file that can be used to replace other similar documents, but the default state is essential DOS boot files. DOS in Windows 95 systems carry, MSDOS.SYS is a text file, is required to start Windows files, but only when you start the DOS can be without this document. DOS boot error, it can boot from a floppy disk or CD-ROM after using the SYS C: command transmission system, you can repair failures, including the boot sector and system files can be automatically repaired to normal.

Caused by failure to read and write FAT table






FAT table records the hard disk data storage addresses, each file has a set of FAT chain, store cluster to designate their address. FAT table corruption means that the loss of contents of the file. Fortunately, the DOS system itself offers two FAT tables, if the current use of the FAT table is damaged, can be used to cover the second repair. However, due to different specifications of the disk of its FAT table length and the address of the second FAT table is not fixed, so the repair must be properly find its correct position, a number of tools, such as NU and others who have such a repair, the use of very convenience. DEBUG can also be used to achieve this operation, that is using its m command of the second FAT table can be moved to the first table Division. If the second FAT table also damaged, you can not put the hard disk back to its original state, but the file data is still stored in the hard disk data area, can be used to repair the command CHKDSK or SCANDISK finally get *. CHK files, This is the lost data on FAT chain sector. If it is a text file can be extracted from a complete or partial content of the document.

Table of contents to guide the damage caused failure

Table of contents recorded in the file name of the hard disk and other data, the most important one is the starting cluster number of the document. Table of Contents In the absence of automatic backup feature, so if the directory is damaged a large number of documents will be lost. Of a method also used to reduce the loss SCANDISK program CHKDSK or method of recovery from the hard drive search out the *. CHK files, because the table of contents damage is only the first cluster number is lost, every one *. CHK file that is a complete file to change it's name can be restored most of the original document.

Accidentally deleted partition data recovery

When using FDISK to delete the hard disk partition, the surface is the hard disk of the data has completely disappeared, without formatting the hard disk will be displayed when you enter an invalid drive. If you know FDISK works, they will know just FDISK the hard drive to rewrite the master boot sector (sector 0 face 0 1) in the content, specifically, that is to remove the hard disk partition table information, while the hard disk in any partition The data have not changed. Can be modeled on the above-mentioned repair partition table wrong approach, that is to find ways to restore the partition table data can be restored the original partition and data. If you have already formatted partition, recovery partition, after an earlier, according to the following methods of data recovery partition.

Mistakenly formatted hard disk data recovery

In the DOS version of the state of high, FORMAT formatting operations have been established in the default state for recovery formatted disk information, is actually the disk DOS boot sector, FAT partition table and copy all the contents of the table of contents to the The last few sectors of the disk (because the latter sector is rarely used), while the contents of the data area has not changed. This command can be restored by running the UNFORMAT. Another DOS command also provides a MIROR disk used to record the current information for formatted or deleted after the resumption of the use of this method is also more effective.