Kirk McElhearn @mcelhearn:
The excellent TuneSpan is on sale today for only $2. See my Tech Hive article: http://www.techhive.com/article/1167721/move_itunes_media_files_to_other_locations_with_tunespan.html …

@mcelhearn Can I use TuneSpan to make them all available? What happens when ext. drive not attached?

Kirk McElhearn @mcelhearn:
@jeffporten It puts them on other disk, and iTunes can find them. No need for symlinks. If drive not on, of course they’re not found.

@mcelhearn 30+ gigs on external, 10 gigs on internal. End up with 40 gigs in iTunes, and 30 gigs of “!”s when drive unattached?

Kirk McElhearn @mcelhearn:
@jeffporten Yes, but just quit iTunes, mount the drive, and relaunch, and it’s fine.