How to Enable iPod "Disk Use" or "Disk Mode"
In order DiskAid to load music or for PicsAid to load your iPod’s pictures from a legacy iPod (Classic or other non-iOS based) you need to enable it’s ‘Disk Mode’ or ‘Disk Use’, here’s how:
Connect your iPod and launch iTunes
Click on your iPod from the ‘DEVICE’ section in the left menu bar
Select the ‘Summary’ tab from the top tab menu
Check ‘Enable disk use’ from the ‘Option’ pane at the bottom of the screen (as displayed below)
Click on the “Apply” button