|If you have recently acquired this laptop contact the original owner and find out what the password is. If that is not possible, contact the manufacturer and ask them to help you and be prepared to show proof of ownership.|
Hard disk passwords on laptops are a security measure because laptops can be so easily stolen. They cannot be removed by conventional means as the hard disk is tied to a chip on the motherboard which needs to be reprogrammed. Only the manufacture can do that.