What to KnowConnect an external hard drive to your main computer and back up your iTunes library onto the external drive. Quit iTunes.Hold down Option (Mac) or Shift (Windows) and launch iTunes. Select Choose Library. Navigate to the iTunes backup on the external drive.When you find the folder (Mac) or a file called iTunes library.itl (Windows), click Choose (Mac) or OK (Windows).
This article explains how to use iTunes on an external hard drive to solve the problem of running out of space on your main hard drive. You'll be able to store and access your massive iTunes libraries easily and affordably.
Using iTunes on External Hard Drive
To store and use your iTunes library on an external hard drive, do the following:
Find and purchase an external hard drive that's in your price range and is substantially bigger than your current iTunes library. You'll want a lot of room to grow into before you need to replace it.
Connect your new external hard drive to the computer with your iTunes library on it and backup your iTunes library to the external hard drive. How long this takes will depend on the size of your library and the speed of your computer/external hard drive.
You may need to Authenticate to make a copy of your iTunes folder; go ahead and do this.
Hold down the Option key on a Mac or the Shift key on Windows and launch iTunes. Hold down that key until a window pops up asking you to Choose iTunes Library.
Click Choose Library.
Navigate through your computer to find the external hard drive. On the external hard drive, navigate to the location where you backed up your iTunes library.
When you find that folder (on a Mac) or a file called iTunes library.itl (on Windows), click Choose on a Mac or OK on Windows.
iTunes will load that library and automatically adjust its settings to make that the default iTunes folder while you're using it. Assuming you followed all the steps in the backup process (most importantly consolidating and organizing your library), you'll be able to use your iTunes library on the external hard drive just like it was on your main hard drive.
At this point, you can delete the iTunes library on your main hard drive, if you want.
However, before you do that, make sure that everything from your iTunes library transferred to your external drive, or that you have a second backup, just in case. Remember, when you delete things, they're gone forever (at least without redownloading purchases from iCloud or hiring a drive-recovery company), so make absolutely sure you've got everything you need before you delete.
Tips for Using iTunes With an External Hard Drive
While using your iTunes library on an external hard drive can be very convenient in terms of freeing up disk space, it also has some drawbacks. To deal with them, here are some tips you'll want to keep in mind:If you delete the iTunes library on your main hard drive, you won't have any music, video, or other iTunes files with you when your external hard drive isn't connected. This may be OK if you've got an iPod or iPhone, but if not, it might be a pain.When you sync an iPhone, iPod, or iPad, make sure you've connected the external hard drive first. Since your iTunes library lives on the external drive, when you try to sync those devices, they'll look for that drive. If they don't find it, syncing will be messy or problematic.Consider disabling the auto-sync feature in iTunes to prevent that kind of problem.If you do sync to your main hard drive, or buy/download items to the main hard drive, you can easily add them to the external hard drive next time you connect it. In that case,
How to Connect the External Hard Drive on iTunes
Hold down Option or Shift when you launch iTunes.
Select the iTunes library on the external drive.
Next, go to File > Library > Organize Library.
In the window that pops up, make sure the box next to Consolidate files is clicked.
Click OK. This will copy the new files that you added to your main hard drive's iTunes library to the external hard drive.