Patent 7685390 was granted and assigned to Hitachi on March, 2010 by the United States Patent and Trademark Office.
A storage system where storage devices themselves have WORM functionality that can be set at any time. The storage system includes storage devices, and a controller for controlling data transmission between the storage devices and an information processor. Each storage device has a storage cell and a fuse at a midpoint on a write control line, and the controller applies a voltage to the fuse to blow it to set WORM for the storage cell.