How To: Enable Disk Mode for iPod
This is a cool little hack. Enabling Disk Mode for iPods allows it to become just that, a nice USB Disk drive, or a way to get those MP3’s back after a hard drive crash.
In Terminal type: defaults write com.apple.finder AppleShowAllFiles TRUE
Then type: killall Finder (make sure to capitalize Finder)
When the iPod if plugged in it’ll automatically mount on the Desktop like any other USB drive and your files will be accessible.