Connecting to my Thomson TiVo by serial cable and logging in pre boot, I get a bunch of options, some of which are to do with drive-locking. Is it possible to permanently unlock the TiVo drive this way?

I realise drive unlocking can be done in other ways (diskutil, Knoppix TiVo image etc), I'm just curious. (Not curious enough to just try it and see though).

Options are below (note 5 and 9).

B - Boot from disk
N - Network (tftp) boot
U - Update flash from tftp flash image
T - Teleworld menu
V - Print TiVo Prom Version
W - Word Write
R - Word Read
P - Change Boot Parameters
M - Configure Memory
C - Configure Video
E - Configure Ethernet
K - Set backdoor password
k - Verify backdoor password
z - Change Serial Number
Z - Run memory tests
1 - Enable/disable tests
2 - Enable/disable boot devices
3 - Change IP/MAC addresses
4 - Ping test
5 - Toggle auto disk locking
6 - Toggle automatic menu
7 - Display configuration
8 - Save changes to configuration
9 - Unlock TiVo Secure Disk
0 - Exit menu and continue