How do I import my old iTunes library from an old PC to my mac through an external hard drive?

Question

Ok, so I actually have multiple libraries (from itouch, nano, ipod) and I want to import the library from my old pc to work on my Mac.
However, I only want it to work from my external hard drive, I do not want it to take any space in my Mac's SSD .
The one thing that you have to know though is:
Although I have some, a lot of my mp3s are not in my itunes media folder. However, the music is in the library itself, the one in XML and ITL format.
So, I know that had all my music been in the media folder, I could have easily added library and selected that folder, but in this case, I don't think it will work.
How do I import my library with my music if the media folder does not have all my songs?
I had exported my library from my old laptop so I just have the library not my songs in mp3 format :/ if this makes sense..

Answer 1

All your library consists of is a text file telling iTunes which files it should include in its listing.  It doesn't have your music.  Your music is in the files scattered around your computer in your case.  You need to do the long process below, first consolidating, then moving the complete library (= the whole iTunes folder):
Quick answer (not for you) if you use iTunes' default preferences settings:  Copy the entire iTunes folder (and in doing so all its subfolders and files) intact to the other drive.  Open iTunes and immediately hold down the option (alt) key (shift on Windows) so you get a prompt to select a library, then guide it to the 'iTunes Library.itl' file in the moved iTunes folder.
Longer answers if for any reason you do not think all library files are inside your iTunes folder (changed preferences settings at some point):
iTunes: How to move [or copy] your music [library] to a new computer [or another drive] - http://support.apple.com/kb/HT4527 - a somewhat bewildering and not always easily understandable set of options.
For the record there's this reference for iTunes 11 but it really doesn't strike me as having the specifics you need. iTunes 11 for Mac: Move your library to another computer - http://support.apple.com/kb/PH12168
2011 ilounge article: Transferring your iTunes library - http://www.ilounge.com/index.php/articles/comments/moving-your-itunes-library-to -a-new-hard-drive/  - An article with good background information (similar to the links above), particularly if you are not sure your media files are all grouped for quick answer above. Unfortunately under the single term "transferring library" it describes two very different moves; relocating just your media (not  really transferring your library and not recommended unless you really need this configuration), and relocating media+database (really your whole "library").  Make sure you understand the difference before electing to move only media.
Windows users see tip at: https://discussions.apple.com/message/18879381