Locating music on iTunes

I've hit a wall here, back on my PC, I used to manually managed my music - they were never bought from iTunes store.

Now on my PC, the iTunes folder was in the default directory, A.K.A C://user/my music/iTunes. however the music files were on G:/my music. I used to put my albums there and then drag the folder onto my iTunes window.

I just migrated to mac and put the iTunes folder in the music directory. It loaded up fine, however the database still points to G:/My music. Is there anyway I could get iTunes to point to /Volumes/Expansion Drive/My Music? This would solve my problem of iTunes not locating the folders.

img for reference: http://i.imgur.com/okrHj.jpg

My only option right now is to locate the songs one by one, and I'm really not keen on having to do that for 11232 songs!

What happens if you click on the "change" button in this window? (Located in preferences)

You should be able to select the drive from there...

This is of course if I've understood your question... ;P

tried it, didn't solve anything

When you change library locations, you have to consolidate the library in iTunes, otherwise it defaults to it's original place.
This article guides you perfectly on what you need to do.

iTunes for Mac: Moving your iTunes Media folder

well looks like i'm going to have to replace all the albums one by one by hand since that didn't work either. should;t have selected manually manage music when I was on windows

Thanks for your help anyway!