Hi! According to ATA specifications every ATA harddisk (PATA,SATA) must have the possibility be protected by a password - the bios must be compatible but most new ones are. A nice progam HD-X Lock makes it possible to install passwords to ones harddisks so that ever time the PC is shut down and is started again a usb-stick or CD-Rom or floppy with this program has to be inserted to provide a password. Otherwise the Harddisk apears to be empty / formatted. A very nice thing if one is a pirate. There is a user password and a master password. With the free version of HD-X Lock one can only set the user password - with the full version also the master password which is important cause the factory set master password in all seagte harddisks is well know (seagate+25 spaces) and samsung has no master password at all installed. With laptops that have a harddisk password setting in the bios one can not use HD-X Lock because when you set a password with HD-X Lock it is internally scrambled and you can not get the harddisk open without putting the lapstops harddisk into a desktop PC.