China DOS Union

I have a desktop computer purchased in 2002 with a CPU of 1.3G, a 40G hard disk (Seagate), and 512M of memory (upgraded now). Because there is broadband at home, I often sing at night. Not long ago, after downloading a few small programs, I shut down normally. When I started up again for the second time, it showed that the hard disk could not be detected. The power-on self-test time was relatively long. When entering CMOS and setting to AUTO, it showed "DEFECT HARD DRIVE". After exiting and restarting, the hard disk could not be detected. When using the A disk to boot, the hard disk must be set to NONE, otherwise the hard disk light is always on and the system cannot be booted. It also cannot be booted on other computers.

This hard disk has only been formatted twice, and there has never been any bad track phenomenon, and now the rotation is also normal.

According to preliminary analysis, it is a virus that has occupied the boot sector. After booting with DOS, DEBUG was used to rewrite the boot sector. After detecting a good hard disk, the bad hard disk was hot-swapped, but when writing and executing, it showed "ERROR" and could not be rewritten.

Because the CMOS could not detect the hard disk, I have tried FDISK, PM, KV3000, and Seagate special low-level format, all of which ended in failure because the hard disk could not be detected.

Using an instrument to measure, the voltage of the circuit on the outer surface of the hard disk is all normal, with no abnormal phenomena.

Above, I really can't solve it. Here I beg all the experts to help test it. The little girl is very grateful.

Oh my goodness, you even measured the voltage.
The last sentence should be changed to "The little girl is extremely grateful". "Little girl" means daughter.
Can this hard drive be used on other computers?

Who told you to hot-swap? You're quite bold (hehe). The IDE interface generally shouldn't be hot-swapped. If it's like the method you mentioned, you could just write the information of the normal hard drive to a floppy disk, then power off and replace the hard drive, and then write it to the hard drive.

If the BIOS can't detect it, it's either a problem with the BIOS or a problem with the hard drive hardware, and nothing else needs to be discussed. But since your BIOS can recognize other hard drives, it's less likely to be broken.

This hard drive of yours is probably physically damaged. Go to a repair shop.

Very grateful to the brothers on the 2nd and 3rd floors.
But I have tried other machines, and it still doesn't work.
I've been using a computer for several years, and I've never encountered this before. I really need the help of all the experts.
thanks for you support!!

Since you've tried other machines and it still doesn't work, why not just throw it away, or take it apart and use the disk as a mirror? It's said that the disk of a hard drive is smoother than any mirror.

Generally, if it's not a mechanical failure, it can still be repaired. If the BIOS can't find the hard drive, I estimate that the problem is with the circuit board of your hard drive. If the hard drive has mechanical failures like the motor or spindle, generally it can still be recognized by the BIOS.

First, a virus cannot make the BIOS unable to detect the hard disk.
Second, if the hard disk light is always on, it means the hard disk itself is faulty. Go and get it repaired quickly.
P.S. If you have enabled HDD S.M.A.R.T, it might show where the problem is.

I also had this situation. The hard disk CMOS couldn't be detected.
My solution: precisely is to hot-swap vigorously until it appears :). Definitely a personal experience. IBM 2G hard disk (the data cable doesn't move, hot-swap the hard disk power supply). After hearing the hard disk rotate relatively evenly and steadily, restart the PC. If it doesn't work, continue.

(Death method: reverse connect +5v and +12v. A damn garbage power supply. The slot has +5 and +12 reversed)
Anyway, not hot-swapping is also to be discarded. It's easier to do this kind of thing when drunk :).
This was a tragic event when connecting to a friend's computer to copy data one year later. In the future, it's best to measure the voltage when connecting accessories to a杂牌 power supply.

My poor IBM 2G

[ Last edited by quanyongji on 2005-9-13 at 04:33 ]

Previously, my machine also had the phenomenon that the CMOS couldn't detect the hard disk. But the solution I used is:

1) Turn off Windows, turn off the machine power supply

2) Find the cyl, heads, sect data marked on the hard disk; check whether the hard disk is connected to IDE1 (Primary first hard disk) or IDE2 (Secondary second), and whether it is Master (master disk) or Slave (slave disk)

3) Power on, enter CMOS setup, find the corresponding hard disk, set the Manual mode, and enter in CHS:
cylinders:
heads:
sectors:
Press F10, press Enter

4) Restart

This is how I succeeded. You can definitely give it a try. This is a safe method, don't worry.

Judging from the phenomenon you described, it is possible that a logic lock has been infected.

Originally posted by born2be at 2005-9-4 16:54:
My machine also had the phenomenon that the CMOS couldn't detect the hard drive before. But the solution I used was:

1) Turn off Windows, turn off the machine power

2) Find the cyl, heads, sect data marked on the hard drive; check whether the hard drive is connected to IDE1 (Primary first hard drive) or IDE2 (Secondary second), and whether it is Master (master drive) or Slave (slave drive)

3) Power on, enter CMOS setup, find the corresponding hard drive, set the Manual mode, and enter in CHS:
cylinders:
heads:
sectors:
Press F10, and press Enter

4) Restart

I find the method proposed by the friend on floor 9 very novel. I never knew there was such a method before. I want to know what the principle is! Is there any expert to give some guidance? Also, I hope the friend on floor 9 can post your configuration.

It should not be a configuration issue. This happened when I was operating a Chinese system in pure DOS with a virtual floppy disk. After a crash, I pressed the Reset key. Could it be that the very current shock caused the loss of CMOS data? Please let the moderator explain!

I have a 20G WD hard drive. After a normal disassembly, it can't be recognized! Manual recognition doesn't work either!
When powered on, I hear a short power-on sound from the hard drive, and then it doesn't move!

Find a good hard drive. See if the BIOS can detect it. If it can be detected, then test your original hard drive. If it still can't be detected, then your hard drive is bad. Replace it.

Is your hard drive infected with a logical lock!