If you have more than just one computer in your home and your media content is spread on all of the systems, at some point you might have encountered the problem of wanting to access some media on a computer that was used at that moment by another member of your family. If you want to do something to avoid this issue in the future you might want to consider buying a large hard drive and move it from one computer to the other in order to grab all of the media.
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After doing this, you should head down to your Mac computer and launch iTunes. Once you do this, the software is going to ask you to either create a new library or choose an existing one. What you have to do is create a new library and give it a name. After doing this you might want to save it to your user account’s Music folder.
Now, go to the Preferences menu in iTunes and select Advanced > Change and then go to the Media folder that you just created on your external HDD. My advice is to disable the Copy Files To iTunes Media Folder When Adding To Library but remember to leave the Keep iTunes Media Folder Organized activated. You now must click on the OK button in order to dismiss the Preferences window. Your next step should Choose File > Add To Library and after that go to the Media folder located on your external HDD and after that click on Open. iTunes will now add names to all of your media content found on that hard drive to the iTunes Library window without moving the files. As you would expect, this can take a long time if you have a lot of content stored on the HDD. You might want to know that depending from where you got the media, during this process some of the media will be misfiled. For this reason, it is highly recommended that you look thoroughly in your media and do any necessary reorganizing. Don’t forget about erasing the duplicate content as if you leave it, this content will occupy unnecessary space on your hard drive. You might want to know that in iTunes you get a Display Duplicate function which unfortunately is not very helpful. However, if you press & hold the Option button, the command is going to change to Find Exact Duplicates which will find more duplicates, but even so it’s far from being perfect. The ideal situation would be to have no duplicates at all or at least only a few of them which can be erased manually.
There’s also a third party application that can take care of your duplicates which is called Dupin and it will set you back $15. This program adopts an iTunes-like UI and can find the duplicates in your iTunes library or it can search for them in certain areas, like Movies, Music and TV Shows.