Hard disk repair soft errors-2

(2) repair the hard disk DOS boot record
Repair method can refer to the above example, to select the DOS version and the hard disk the same type of computer is suitable.
① to start a normal computer, and drive home an A blank, formatted disk, type the following statement sequence:
C> DEBUG
-L 100 2 01
-W 100 0 501
At this point, has made well-DOS boot disk in the floppy disk blocks and write the logic 50H sector.
② The DOS floppy disk boot failure of the computer, after entering DEBUG into the floppy disk drive A, type the statement in the DEBUG state sequence:
-L 100 0 501
-W 100 2 01
At this point, the hard disk DOS boot record repair is completed

(3) repair system files





System, system boot files are an important part of the module, if damaged or wrongly IBMBIO.COM or IBMDOS.COM deleted, DOS command SYS can be used to recover, that is, DOS boot floppy disk system, the implementation of SYS C: command, if the response "System transferred "indicates that the two systems has been hidden file transfer to your hard disk, if the response to" NO ROOM FOR SYSTEM ON DESTIN-STION DISK ", said the transmission failed, because IBMBIO.COM must be occupied by the root directory of the respective first and second directory entry , and the need for a continuous front of the hard disk data area storage space, and these conditions have been damaged in other documents. The solution was to use a feature observed PCTOOLSCT the MAP FLLES disk image map that can identify the suspect file and delete it, until the SYS tell you until the SYS-TEM TRANSFERRED.
It is worth mentioning that, SYS command is not sent to the COMMAND.COM hard drives, to restored, can COPY command. The implementation of the "COPY A: \ COMMAND.COM C: \"

(4) hard disk formatting
In the repair done to attempt to do so, however, failed cases, the last resort is to reformat the hard disk, a complete hard disk format is divided into three steps, namely initialization (low-level formatting), establishing partition (FDISK) and the format (FOR-MAT C: / S). The operation of the hard disk is formatted in the following we are devoted to.

Second, the hard disk read and write errors when using the maintenance

1. The hard disk can not read and write files

Hard disk drives After a period of use, suddenly can not call some of the document.
The reasons for this failure the following two points: First, the use of information within the disc for some time after the natural loss; 2 is a user to use the hard disk properly, causing the information in an artificial disc is lost. Such as the proper head to read, write operation, a sudden power-down or shut down; another example, head work, the plate body subject to greater vibration, is a collision between the head and the platter, resulting in the user zone data disc or track was damaged.

This troubleshooting method is to call the system file FORMAT.COM to re-format your hard drive and then make a backup copy of the file back to the hard drive. At this point, such as using CHKDSK System File Checker may be displayed on the screen XXXXKB BAD SECTORS.

2. The hard disk can not be started

Hard disk drives After a period of normal use, a sudden can not boot up the operating system, such as the call to C drive, the screen displays "Invalid drive specifica-tion", shows call an invalid drive.
Rise to the possibility of such failures are manifold, which include soft fault. 00 tracks the presence of soft failure is one of the main failures leading to the above, here from a software maintenance point of view on the situation and maintenance of the 00 tracks means.
In the 00 tracks on system files and the hard disk bootstrap procedures, and 00 tracks is also head of the reference point to find other tracks. Therefore, the 00 tracks and 00 tracks of good and bad information have a direct impact on the hard drive can work properly. If used improperly or some kind of accident has damaged the 00 tracks on the written document, then after the boot, C drive can not boot the operating system, or even the head simply can not seek to read and write files. At this point, without formatting C drive is like mine, so when the user is called C drive, the screen will display "Invalid drive instruction." Exclude this fault is physically re-formatted drive C, re-DOS operating system partition and re-formatted region, and it is copyed into system files.

Because there are two hard disk boot record (assuming the hard disk is divided into a partition), one is the master boot record, one is the partition boot record. Master boot record cleared and re-write can use the physical format (low-level formatting) program (LOW-FORM.EXE, DTCFMT.EXE), thereby foregoing the process of troubleshooting, the first to use the physical format. The second step is to use DISK.COM right to partition the hard disk partition information and to be registered in the master boot sector, but it does not change the master boot record code execution. The third step is the use of FORMAT.COM region of the DOS format, because the master boot record does not belong to any partition, so FORMAT.COM program can not clear the master boot sector of any information. After the completion of the above three steps, and then operating system files written to the hard disk, thus, re-generate the hard work not be completed until this time, the hard drive already has the ability to bootstrap, you can use.

When using a floppy disk drive A boot after the operating system can display hard disk in the file directory, but can not boot from the hard drive operating system.

This occurs generally due to the system file is not written or damaged. Operating system files, a total of three components, namely, a two hidden files and COMMAND.COM files. Two hidden files are written in the 00 Road, the event of a failure, then the host can not boot the operating system.

Troubleshooting method is to use FORMATC: / S / V command to conduct a re-format the hard disk and then copy the backup of user files back to the hard disk can be restored to use.