HOW CAN I UNLOCK MY 30GB IPOD

Connect your iPod to the primary computer you use it with (the first one iPod synced with), and open iTunes. When you disconnect iPod from the computer, it will no longer be locked. If you can't unlock iPod using either [the code or connecting it to the computer you use to manage its songs]. . . you can restore your iPod to factory settings using iPod Updater. Please note that this will erase all data on your iPod. Afterwards, you can add your music and data back to your iPod.

hold centre button & play button down at the same time this should re set it.

first force the iPod into disc mode. (At the same time) Press and hold the menu and center button down. Continue holding down until those buttons until you see an apple appear on the screen. AS soon as you see the apple, let go of those buttons and switch to pressing the play and center buttons together until you see a check mark appear on the screen.
Once that is done and the iPod is in disc mode connect it to your computer. YOU WILL NEED TO RESTORE at this point. If you need further assistance please do let me know :)
mel

plug in your ipod and go to itunes it should automatically unlock it

switch to them from hold and hold down menu and the center button until it restarts

this will unlock your ipod if its disabled or if you have forgotten the unlock code
http://www.fixya.com/support/r977231-disabled_or_code_forgotten