Computer memory protection

Details Computer memory protection Computer memory protection

G - Physics

06

F

G06F 11/30 (2006.01) G06F 1/00 (2006.01) G06F 12/14 (2006.01) G06F 21/00 (2006.01)

Patent

CA 2123001

2123001 9309495 PCTABS00022 A write protection device (10) prevents data from being written to selected portions of the hard disc of a computer. The write protection device is connected between the CPU of the computer and the controller for the hard drive. The write protection device monitors the read/write commands from the CPU to the controller. The address of each write command is compared with preselected address(es) stored in registers (12, 15) corresponding to the partition area and boot sector, and/or any other preselected address listed in a look-up table (160). In the event of a positive comparison, the write command is prevented from reaching the controller. Individual sectors of the disc can be write protected while still permitting writing to other sectors, even within the same cylinder. Low level format commands can be detected and disabled separately from write commands.

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