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So, I plugged my Touch into my machine to throw another song on there, and find that all 20GB of music has disappeared. Far as I know, I didn't do anything to it. Has anyone else seen this happen?

Have you plugged it in to another machine lately?
Are there other user accounts on your machine?

Why do you think the iPod deleted your music? Since iPods as a rule take music from iTunes rather than deleting it, it doesn't seem plausible that the iPod would be responsible for accidentally deleting all your music.

Did you change your short username if you're using a Mac?

The answer to all questions: no.

An iTunes library can't just disappear without other items disappearing as well, and it wasn't your iPod. Moral of the story: Backup, backup, backup.

I'm not sure what you're saying here. It happened: I had ~20GB of music on the thing. When I plugged it in the next time, there was no music whatsoever on there. So, while you may tell me it didn't happen, it clearly happened.

Mayhaps I have found a very serious bug in the Touch.

edit: if you Google around you will see I am not the only person this has happened to.

When you opened iTunes, was your music there? Was it after you plugged in your iTouch that it all disappeared?

Yes: all the music in my iTunes library, on my Mac, was still there. All of the music on my Touch was gone, even to the point where the Info window showed the Touch with 30 GB of free space.

Maybe you accidentally synced the iPod with an iTunes library on another machine or user account which had no songs in it?

Nope: never been attached to another machine, and there is only one user account on this machine.

For the record, I resynced my music. I hope it doesn't happen again.

Did you change your short username if you're using a Mac?

Wow, I asked the exact same thing. I'm guessing the answer is still no.

connect iPod. Click on ipod in left column. Verify settings in the music tab. Make sure all music or your selected playlist is set to sync. Make sure your playlist has music in it.

Nope: didn't do anything of the sort. Music just went "woof!"

Anyway: resynced all my music. Waiting to see if it happens again.

This title reminded me of "iTunes broke my cd player".

I'm glad to see its nothing of the sort.

It happened to me last week. I was listening to my itouch and was looking for a song and it was gone. So then I plugged it into my Powerbook to do a search and it wasn't there. After I had unplugged itouch, I clicked on the itouch and all of my songs were gone. When I looked at it again on my Mac the info read 7GB of other, when before it read 7GB of music.. My videos were gone too. My restore did not set the itouch back. Most of the Apple Widgets were missing and the touch screen did not work.

AGGHHHH!!!! on Flickr - Photo Sharing!

If some of the apps were gone but not all and there was 7 GB of other sounds like it was just a bad restore.

Somehow my 7GB of music was moved. I'm guessing somewhere on the iPod. When I took it to the Apple store they restore it to the original w/o upgrade, it was fine. At home I tried twice and it didn't work. Apple guys said the same thing, that my Mac file could be corrupted. So, he gave me a new itouch. On the 2nd itouch, my restore worked. So I don't think my files were corrupted. Something on my 1st itouch caused all of my media to move. very weird.

The same thing happened to me today. My 16gb ipod touch is brand new. I got it yesterday and I only plugged it into my laptop. I installed the most current firmware and the software upgrade. My touch worked fine last night and this morning playing all my 10gb of music, but after lunch I was using safari, I went back to the home screen and pressed the music button and it said that I had no music. I am resynching it now and the ipod is reloading all my 10gb of music (when I plugged it in after it registered no music, there was 0gb of music on the ipod), but it sucks that this happened and I hope it doesn't do this again.

Methinks a bug has been found.

that happend to me couple of days ago. no music and no video and i just plugged it for charge