I have a couple of Hard drives (Seagate 10GB and Samsung 20GB) locked with a password. But, when I connect either of the hard drives to my PC with Intel D845GLLY motherboard, it detects the drive but, gives an error message "Primary Master Hard disk error. Press F4 to resume". It then goes to the setup screen. After exiting the setup and booting the PC, ATAPWD and mHDD are not able to detect the hard drive. My guess is - after the POST error, BIOS disables my hard drive because of which, none of the applications are able to see the hard drive. There is no way to disable autodetect in the BIOS. Any idea how I can unlock these drives? I don't have any other PC to work with.

An ATA password-locked drive is seen anyway in BIOS and give NO error (at least on my systems does) but cannot access data. So the problem may be elsewhere.

It may give an error if the OS or BIOS try to access the sectors on the drive - to read partition table ... Drive will return error - abort if password is set. So it would depend on how the BIOS responds (if at all) to Password protected drives.

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If you can keep your head when all about you are losing theirs, you probably don't fully understand the situation. ... Mr Kipling

https://www.mjm.co.uk/

one other thought .. Are you connecting both drives at the same time on the same cable ? If so check the jumper settings, you need to set one as Master and the other as slave.

_________________
If you can keep your head when all about you are losing theirs, you probably don't fully understand the situation. ... Mr Kipling

https://www.mjm.co.uk/

I don't have any other device on the same IDE cable.
BlackST, What motherboard and BIOS does your desktop have?

this should not matter. BIOS shoul still identify your device, and MHDD should also see it.

Try Victoria for DOS .