Windows 8 Tip: Overcoming Library Limitations
...
Adding removable storage to a library
Consider a typical Windows 8 tablet, like the Samsung Series 7 Slate. This machine has a relatively paltry 64 GB SSD barely large enough to hold Windows 8, Office 2013, and my music collection. But what if I want to bring some movies along to watch on a plane or whatever? The device does have a micro-SD slot, so I purchased a 32 GB micro-SD card, loaded it up with movies and took it on the road. Playing movies off the card is simple enough: Just open File Explorer, find the movie you want, and play it. But if you try to add that location to the Videos library, youre out of luck. Windows 8 will not let you add non-hard drive-based removable storage to a library.
(Though you can add a USB hard drive to a library, youll see this same error with other USB-based storage devices, like memory sticks.)
The workaround for this one is simple. Create a shortcut on your desktop that points to the removable device. Give it an obvious name (like SD in my case) and then move it to the root of C: (as in C:\SD) or somewhere else convenient. Then, add that location (the shortcut) to the library. Voila! It works. On the Samsung tablet, this is in fact the only location I use for the Videos library
...