Locking is a feature that's built into some hard drives. This is to prevent unauthorized access to the drive by removing it and installing in another computer.
The lock is a long hexadecimal key that's based on the serial number of the xbox, and other variables. So if you remove the stock drive from an Xbox, you can't read it in a PC. In fact you can't even access the drive.
You can Unlock a stock drive and use it in a PC with ConfigMagic. You must lock in order to be able to boot with a Stock BIOS for Live play.
EDITED because I should have remembered the basics. Too goddamned late, I'm goin to bed.
This post has been edited by Intelligoth: Dec 13 2003, 07:19 AM