Hard disk failure repair techniques-2

Physical bad sectors hard drives

If you have DOS can go to C drive, while the hard disk is not working properly, it is likely to be the hard disk has bad sectors occur. In general, the hard disk bad sectors can be divided into the logical bad sectors and physical bad sectors. Generated when the logical bad sectors are generally not seriously affect the use, it is likely to be the physical bad sectors.

Physical bad sectors we are dealing with the core idea is to cluster these are bad sectors into a single partition, and hide to avoid the other programs call, so that you can prevent the proliferation of bad sectors, so as to avoid greater losses. For this processing, we mainly use Partition Magic6.0 this software under DOS.

In the DOS interface into the PQ 6.0, we first used under the Operations menu, Check For Errors command to determine the physical location of bad sectors, because PQ6.0 this feature very well, unlike Windows, the Scandisk as often misdiagnosed.

PQ6.0 the real power lies in its ability to cluster all the possession of bad sectors marked with a special calibrated out, and you can select all of these bad clusters, and then they are divided into a separate new partition. This is a graphical operation, it is very convenient. Subsequently, we should bear in mind that hidden partition is full of evil, so as to ensure that it will not be called. At this point the use of Advance under the Hide Partition menu commands can be achieved.






After possession PQ6.0, physical bad sectors are really not difficult to solve, and can effectively prevent proliferation. But should be noted that, in any event, this time the hard disk is already in sub-healthy state, in which the data is still very dangerous. PQ6.0 after treatment with the physical bad sectors, what piece of the hard disk is also difficult to say how much time, it depends on luck.

Low-level DOS boot failures - lock logic

Hard logic of lock is a very common means of mischief. In a logical lock, regardless of whether the use of any equipment does not properly boot the system, or even floppy disks, optical drives, hard drives are the same double-hung has no effect.

To solve the problem logically locks, we should know the root of the problem. In fact, DOS system startup, it will search all Logical disk order. First, find the master boot sector of the partition table information, it is located in the hard disk of the zero-zero-cylindrical head of the first sector of OBEH address of the beginning of the, when the partition information for the beginning of the 80H that is the main boot partition, the other for the extended partition, the primary boot partition is defined as the Logical disk C drive, and then search for the extended partition Logical disk, is defined as the D drive, and so find the E, F, G ... ... logic of the lock is in this start with, modify the the normal primary boot partition record, will be the first one extended partition points to itself Logical disk, DOS at boot time to find to the first one Logical disk, the search for the next Logical disk is always to find their own so that a loop is formed .

For such problems, if you do not want the data on the hard disk, then deal with them very readily. We can all IDE interface in the BIOS will set NONE, then use the floppy disk to start the system, this time can certainly start, because the system simply do not drive. Then, we use the classic hard drive management software, DM has. As the DM may not rely on the motherboard BIOS to recognize the hard disk, so you can use DM to partition formatted so that we can completely solve the problem, and fail-safe, simple and convenient, the only regret is that the data retain his job.

There is also a way is also very worthy of recommendation, it can keep the hard drive data. First, to prepare a boot disk, and then in a normal machine, using a binary editing tool you're familiar with (UltraEdit, etc.) modify IO.SYS file on the floppy disk (remember to change the document before the amendment of the properties of normal), the specific Search in this document inside the first one "55aa" string to find the future value can be modified for any other. This modified system with the floppy disk you can be locked with a smooth hard drive started. However, the normal time due to the hard disk partition table has been damaged, you can not use FDISK to delete and modify the partition, but now can use the above to restore the partition table on the way to deal with.