Use an external hard drive - want to connect to a different computer...

Hi, pardon my ignorance but...
I keep all my ipod music on an external hard drive since I only have my work laptop, but the programs are on the computer. I used to never have a problem accessing itunes through my work laptop once I plugged the hard drive in.
The last time I synched my ipod there were about a dozen songs that I got a message "Some of the items in the itunes library, including..., were not copied to the ipod 'My iPod' because you are not authorized to play them on this computer". Some of the songs were explicit content, some weren't. Some I bought on iTunes, some were loaded from cds.
If I take my external hard drive and plug it into a different computer what will happen? Is there a way to get those songs back on my ipod? Again, sorry for not being too saavy. I have a 30GB video iPod.

+yes, when my external hard drive is plugged in, it lets me play the songs...+
So, were you expecting them to play when the exHD isn't plugged in? Because they won't!
Also, you need to have the exHD plugged in before you even start up iTunes, or your library file will get messed up.

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