[ShadowKnyght]

Do I need to lock my HD when installaing a larger one:
Yes you do if you want to use Xbox live or play with your chip disabled

Can I use my Xbox HD on my PC after replacing it with a larger one:
Yes - but you need to have unlocked it first whilst it is installed in the xbox it came in - use the slayer CD

Note: - xbox HD's are only 8 to 10GB so most people would not bother using them when most PC sytsems are now sold with 40, 80 and 120GB drives.

How do I set up a larger HD for use in my Xbox:
1) Install the desired chip
2) Boot using the chip active and the slayer CD inserted
3) Unlock the original HD (if you want to use it later in a PC)
4) FTP to the xbox to back up any saved games (skip this if it is a new xbox)
5) Remove HD
6) Insert new HD with it set to cable select
7) boot using the slayer CD - format the HD and install applications
8) lock the HD

I could add more but typically - I suggest the best source is xbox-scene.