(Although, before that, here's stuff on BIOS Password resetting:
The ATA Password is part of the ATA-3 specs, designed, and usually enabled on laptops to prevent drive use once the drive is stolen. There are two passwords, one master, one user. Passwords are _not_ stored in the BIOS, so resetting the BIOS will not help you. May do more harm than help? I don't know. The passwords are stored in the drive firmware and failure to enter the password will result in all reads and writes being denied. There is also usually a certain amount of time you can try the password before the drive will lock up, and refuse further attempts until it is powercycled (eh, turned off, then turned back on.)
--> May be possible to stick the ATA drive in an IDE USB enclosure. That _may_ bypass the password requirement? One reported success...
--> May be possible, but less likely, to swap the controllers...would require a similar disk drive though.
--> A clean room recovery by moving the actual disk platters to another drive may work.
--> Recovery is possible with professional services, although costly.
--> There are recovery tools online, for a fee. Usually, they're remote services (You install a program, program calls home, and stuff is repaired from there)
--> There are some programs out there to alter settings. Names I've seen include:
-----ATA Password Tool 1.1 (Included in the Ultimate Boot CD: PC repair boot CD)
--> Formatting the drive may not do you any good; the passwords are apparently stored in firmware, and not on the actual drive...?
--> There's some tool by some company in the UK that'll do something about the password. Vogon was the company name, I believe.