Today I had my 4th gen iPod connected to my work PC on a USB 1 port. Everything worked fine. I was able to play the music on it through iTunes. I restarted my computer, and continued playing music. Then iTunes crashed. The iPod remained in a "Do not disconnect" state. iTunes would not restart. I restarted my computer. The iPod remained on "Do not disconnect," but did not show up in iTunes or as a connected device. I disconnected the iPod. It remained on "Do not disconnect." I tried to restart the iPod by holding down Play/Menu without effect. I tried holding all the buttons. No change. I moved it to another computer, and it showed up as a USB device that could not be started. No change on the iPod.
It's now about three hours later, and the battery is almost dead, which is remarkable since it's apparently not doing anything. It must have the disk spinning non-stop to use the battery this quickly, but I can't hear the disk so I'm not sure.
I imagine the only way to reset it is to let the battery die, short of opening the iPod and disconnecting the battery. What a pain in the neck. Anyone else have this problem or hear of it?
Edit: since everyone seems to want pictures, here's one.