Welcome you use the "Hard Disk Usb Lock", you can copy this software into a bootable usb disk, and use the usb disk, you have got the key of your computer, make your hard drive become a lock and your usb disk become a key, you can use the key to lock your lock at any time, after locked if you start your computer from another usb disk, floppy disk, hard disk and CD or slave disk are not access to the disk, to make you data on the hard disk security to achieve the highest. The software is applicable to Windows operate system only.