Moving a locked hard disk to another machine will not unlock it, since the hard disk password is stored in the hard disk firmware and moves with the hard disk. These passwords are not the same as BIOS passwords. Some laptops provide a utility to lock a hard disk with a password. If you put the locked drive into another PC it cannot be unlocked even if you have the password. The stronger the password the harder it is to crack it. No encryption, it locks the hard drive so data cannot be accessed, this is done by a chip on the hard drive controller board, they are very hard to break into if you do not have the password, some makes/models are impossible even by data recovery/crack experts.
