Reliably use one external drive with iTunes files with two computers?

Hi all,
I have an iMac with a 200GB external firewire drive as my main desktop. I also have a 12" Powerbook that I use around the house. I've also used the PB to stream music from my iMac to my stereo. I have the odd bit of trouble with this, music stopping and not reconnecting etc.
We had a party last weekend and to stop the problems with wireless streaming occuring, I unplugged my firewire drive from my iMac and plugged it in downstairs to my Powerbook.
To get the files to appear in iTunes on the PB, I had to drag everything across to from the finder to iTunes. After a while everything was there.
The party went well: one visit from environmental health telling us to turn things down, and one visit to accident and emergency.
Next day, I returned my firewire drive to to my iMac and now every track in itunes has an exclamation mark next to it.
I know how to sort this out, and I'm not bothered about losing my playlists: what I want to know is a safe method to allow me to move my harddrive around and make sure it's all OK when I plug it into my iMac again.
Any ideas?
I suppose I probably left on the "Organise the music into folders" option when I first plugged in the drive to my PB and the files have actually moved a bit. Would making sure that this was set on both machines be a food thing to do?
Cheers
Stuart

I suppose I probably left on the "Organise the music into folders" option when I first plugged in the drive to my PB and the files have actually moved a bit. Would making sure that this was set on both machines be a food thing to do?
That probably changed the file locations, presumed the 'Organize' option was turned off on your iMac.
Now your 'iTunes Library' file (iTunes' database) on the iMac can't find the files.
It's a good thing to have the option turned on (or off) on every Mac you connect your external drive to.
I used to have my library on an external disk too. The only thing I had to take into account was to copy the 'iTunes Library' file from one computer to the other when connecting my external HD.
Never ran into problems.
More info about the library files here.
If you're running OS X 10.4, you could create an Automator workflow to copy the file to your external HD and another one to copy it from the external HD to the Powerbook.
Hope this helps.
M
17' iMac fp 800 MHz 768 MB RAM   Mac OS X (10.4.6)   Several ext. HD (backup and data)

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