Upgrading from Mac Leopard to Snow Leopard-clean install-external HDD

1. Buy a WD Scorpio 320GB and put it in an external enclosure
2. Format the drive and USE A GUID partition
-Make a new partition on the external drive to hold the OS/applications -Mac \hdd
-Make additional partitions to hold videos...
3. Insert the Snow Leopard CD and reboot
4. Install Snow Leopard on the external hdd Mac \hdd partition
5. Reboot
6. Update the Mac software Menu->Apple->Software Update
7. Now copy your old login.keychain to the Mac \hdd/Volumes/Users//Library/Keychains
8. Use Keychain Access to create a new keychain file. Then quit Keychain Access. In a shell, copy the old keychain file over the newly created on.
9. Enable root access: http://support.apple.com/kb/ht1528
10. Follow the instructions on this page except ignore the Keychain restoration procedure. Apple personal information transfer instructions

Selecting the right HDD for large data applications

Selecting the right HDD is about more than just getting a good deal at Frys. Not all hdd's are created equal.
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Drive specs including platter sizes