Usb Share [Root] for Android

USB Share is a root application for Android that enables you to use your device as USB memory stick or better it emulates an USB memory device. You can select the folders you want to share etc. with it.
Made by the developer is the well known Script Manager (at least advanced users should know it).
There is a trial version which is recommended to try for your needs before you purchase it.
Using this app you get an USB stick with internet access. So you can copy your data to your device and start the emulation while you are on the road. For example download music to your device wherever you are, start emulation and listen to it in your car.

https://play.google.com/store/apps/details?id=os.devwom.usbsharer