A blocking device provides read and write protection for computer long-term storage devices, such as hard drives. The blocking device is placed between a host computer and the storage device. The blocking device intercepts communications between the host and the storage device and examines any commands...http://www.google.fr/patents/US6813682?utm_source=gb-gplus-shareBrevet US6813682 - Write protection for computer long-term memory devices
Write protection for computer long-term memory devices
