6.47 gb of reserved space?!?

OK, so I have a 30 gb zune. And I knew I was running out of space so I checked how much I had left. It said I had 22gb of music and 6gb of reserved space and content from other computers. So i went to settings and ensured that my reserved space was set to 0. Still it still said I had 6gb of reserved space and content from other computers. I'm not sure what content from other computers is, but I don't think I have any of it. Can somebody please tell me how to fix this cause I wanna add more music and I only have a few mb remaining!
Thx!

This is a really common problem I am seeing.

Basically any content that wasn't put on your Zune by your current computer is considered reserved space for content from other computers. Included in this space is content from Zune (anything preinstalled).

The only way I have found to completely erase that space is to do a full reboot and delete.

**** WARNING **** You will lose all your content on the Zune Device if your proceed

1) Set the Hold switch to unlocked.

2) Press and hold the Back button at the same time as you press the top of the Zune pad. When the Zune device begins to start, release the buttons.

3) If you have a Zune 4 GB, Zune 8BG, or Zune 80GB, immediately press and hold the Back button at the same time as you press the Play/Pause button. Continue to hold these buttons until the Zune device restarts and you receive the following message:
If you have a Zune 30GB, immediately press and hold the Back button at the same time that you press the right side of the Zune pad and the center of the Zune pad. Continue to hold these buttons until the Zune device restarts and you receive the following message: