How to enable USB Mass Storage (Mass Storage Mode) on BlackBerry 10
USB Mass Storage - aka Mass Storage Mode - allows you to easily transfer files to and from your SD card when connected to a computer. When you first plug in your BlackBerry 10 device to your Mac or PC however, you may have a bit of trouble finding the mounted drive. You'll need to make sure that USB Mass Storage is enabled or you'll be stuck wondering why nothing is happening. Turning it on is super easy, and we'll tell you how to do it.
This is a good tip to know or you may go nuts trying to figure out why your device won't connect to your computer. To enable USB Mass Storage on your device perform the following steps.
Tap the Settings icon
Tap Storage and Access
Scroll down to the bottom and toggle USB Storage Mode on
Done! Now when you connect your BlackBerry 10 device to your computer you'll see your SD card listed as a mounted drive.