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For Macbook Air and Macbook Pro, with SSD, the drive might be limited to 128GB or 256GB. The drive also might have bootcamp for Windows, so that will further decrease the drive's size for Mac.

When the drive is closer to being full, can we "switch" between

/Users/mike/Music/iTunes/iTunes Media

and

/My Passport/iTunes Media

any time we want? (My Passport is a Western Digital Passport Drive with 1GB).

That seems ok as the Help in iTunes's Preferences says:

iTunes Media folder location

To change where songs and other files you import into iTunes are located, click Change.

To change back to the original location for files (Home/Music/iTunes), click Reset.

This is also useful if we want to keep, say, 20GB of music on the MBA or MBP, so we can take it with us any where, and keep all the PodCast videos, movies purchased on iTunes, iTunes U videos on the external drive, so when we are home and plug in the external hard drive, we can change the path back for the videos.

(This is not so convenient, as we need to change the path for music and then for videos, but at least it may be a workable solution. My library is about 550GB on iMac so I am afraid it may mess things up if I change it to the external drive and change it back and all the references to songs and videos, and the indexing for search are gone).

(what if we create a "symbolic link" from /Users/mike/Music/iTunes/iTunes Media/iTunes U to /My Passport/iTunes Media/iTunes U and the same for Movies and Podcasts as well, and copy all those files over? Then when the drive is plugged in, things should work, but if we unplug the drive and take the MBA or MBP to a coffee shop, will iTunes act weird or lose the references or index to those missing videos?)

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1 Answer 1

Hold the Option Key (alt) and then open iTunes and it will ask which iTunes library you would like to use.

enter image description here

I use one as my main library and another on a NAS as an archive for stuff I hardly ever listen to but can't bring myself to delete.

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interesting... is this quite new? it seems the common thinking was we can't have 2 libraries for iTunes in the past –  動靜能量 Jun 22 '12 at 17:03
    
hm... I am using iTunes 10.6.3, and when pressing and holding Options, I click on the iTunes icon and it runs without asking for which library. Is some steps done wrong? –  動靜能量 Jun 22 '12 at 17:16
    
Nope, it's the only step. Make sure you hold it long enough and not just when you first click perhaps? –  AlanJC Jun 22 '12 at 23:44

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