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Zero track in hard disk on a very important position, hard disk master compaq presario a903tu laptop keyboard boot record (MBR) area in this position. MBR is located in hard disk 0 track 0 cylindrical 1 sector, including storage of a hard disk master boot program and hard disk partition table. In a total of 512 bytes of hard disk master boot record sector, 446 byte belongs to hard disk master boot program, 64 byte belongs to hard disk partition table (DPT), two bytes (55 aa) belong to partition end mark. Thus it can be seen, zero track once damaged, will make the hard disk master boot program and partition table information to suffer serious damage, leading to the hard disk can't boot.
 
Zero track damage belongs to one of the hard disk bad word, just because of its position is too important, so once destroyed, it will have serious consequences.
 
Usually the maintenance method is through the Pctools9.0 DE (disk editor) to repair (or similar to disk sector editing tools can also), the method is as compaq presario a903xx laptop keyboard follows:
 
With Windows9x startup disk boot, insert contains Pctools9.0 CDS. Operation of PCT90 directory DE. Exe, first enter the "Options" Tab menu, choose "Configuration" (Configuration) command, press "Spaces" key remove ReadOnly (read only) in front of the hook (according to the Tab key switch), later, save exit. Then Select and implement the main menu "Select" (choice) of the Drive (driver), in later in the "Drivetype" (Drive type) of paragraph, the choice of Physical (Physical), and press the blank space selected, and then click "Tab" key switch to "Drives" item, Select the "Harddisk" (hard disk), finally, Select "OK" and press enter.
 
Later, back to the main menu, open the "Select" menu, then will appear PartitionTable (partition table), selected and enter, then there are hard disk partition table information. If there are two hard disk partitions, l partition is disk C, this partition from hard disk 0 cylindrical start, then, will be 1 division of the BeginningCylinder from (cylindrical) of 0 to 1 is ok. Save then quit.
 
Note that compaq presario a904tu laptop keyboard in before modification will drive the important material backup out. Restart, according to the Delete button to enter back to the CMOS setup, choose "IDEAUTODETECT", we can see that CYLS number than the original reduced 1, after that, save Settings and exit. To partition, formatting, can save hard disk.
 
Note: because DE tool only to FAT16 partition hard effective, therefore, the FAT32 drive for the hard disk, it may through the partition master (PQ) disk tools, will FAR32 convert to FAT16, and then carry on the treatment.
 
In addition, there are some exploration out through the modified hard drive motor positioning system to change zero track position and through the circuit adjustment to change the distribution of the magnetic head logic, in order to achieve repositioning zero track purpose. Of course it needs more profound hardware level, the realization rise also more complex.
 
Partition table damage repair
 
Hard disk master boot record in the sector is also virus key attack place, through the destruction of the master boot sector DPT (partition table), can be easily damaged hard disk partition information.compaq presario a905tu laptop keyboard Partition table damage usually is not a physical damage, but partitioned data is destroyed. Therefore, usually, can use the software to repair.
 
Normally, hard disk partition after backup a partition table to floppy disk, CD or USB disk is very wise. This aspect, the domestic famous rising antivirus software provides a complete solution. In addition, for no backup partition table of the hard drive, also provides corresponding repair methods, but the success rate is relatively low.
 
In addition, Chinese disk tools DiskMan in this aspect is also great trouble-makers. Reconstruction partition table as one of its important function, very suitable for used to repair damaged partition table.
 
For the compaq presario a906tu laptop keyboard hard disk partition table was zoning adjustment software (or virus) serious damage, cause the hard disk and system paralysis, DiskMan can not be destroyed by the partition boot record information to establish partition table. In the menu choose toolbar "rebuilding the partition table", DiskMan namely began to search and rebuild partition. DiskMan will be the first to search 0 cylinder 0 head from 2 sector began to the implicit sector, looking for virus moved the partition table. The next search each head first sector. Search process can use the "automatic" or "interactive" two kind of way. An automatic way to keep found each partition, it is suitable for most cases. Interactive way to find every division are giving prompt, selected by the user is retained. When an automatic way to reconstruction of partition table is not correct, can use interactive way to search.
 
But, you need to be aware that compaq presario a907tu laptop keyboard reconstruction partition table function cannot do one hundred percent of the repair partition table, unless you've backup a partition table, and then through the reduction before backup partition table to repair damaged partition table. So visible, usually backup a partition table is so necessary!