itunesmusic
I'm organising my iTunes media in two folder myself /Volumes/Data/Music and /Volumes/Data/OtherMusic. My 2nd hard-drive port (yes, the port, not the HDD itself) died so I copied all music to Volumes/System/Users/Me/Music/Music and Volumes/System/Users/Me/Music/OtherMusic
How do I change all tracks in the library to be connected to the new location WITHOUT
if I have to tinker with bash and RegEx that is fine too.
The easist way would be to copy the files in "C:\Users\thomas\Music\iTunes" to the same folder in your new user account. This should link everything back to the external drive. The files are:
.iTunes Preferences.plist
iTunes Library Extras.itdb
iTunes Library Genius.itdb
iTunes Library.itl
iTunes Music Library.xml
One of the many useful scripts in Doug's AppleScripts for iTunes is Music Folder Files Not Added, which will do exactly what you're looking for. Just download and run it, and it will give you a list of all files in your iTunes folders that aren't in the library.
Best Answer
Step 1: Install iTunes
Step 2: Move any new content
Step 3: Copy the iTunes backup from your old computer
Step 4 (optional): Add back new content