Returnstar HDD Lock is the first patent top-class HD security product worldwide developed by us on years of endeavor. Have won favor and praise of many governments, trading & high-tech enterprises, and individuals. Even be taken away and installed on other computer, the HD is unable to boot, low-format, re-part (FDISK) and high-format, let alone stealing the data in other ways。 HDD Lock is a USB Device based on BIOS, support any OS. Under OS it also can be used as USB Storage Device with 1G storage space. It is especially applicable for fields that require confidentiality on HD data and information。