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.
Showing posts with label hard drive. Show all posts
Showing posts with label hard drive. Show all posts
12/21/2009
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.
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.
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