2nd gen ipod software update issue

No a good error.

Error 1 or -1

This may indicate a hardware issue with your device. Follow Troubleshooting security software issues, and restore your device on a different known-good computer. If the errors persist on another computer, the device may need service.

http://support.apple.com/kb/TS3694#error1

You will need to upgrade to iOS 3.1.3 prior to the upgrade to 4.2.1. See below.

http://support.apple.com/kb/HT2052

stedman1, you are wrong. The link yo gave is for update the 1G iPod to the last update for that model.

A 2G can go straite from 2.1 to 4.2.1

trebor72 You should check to ensure you have a 2G and not a 1G.

Identifying iPod models

Just checking.