Unfortunately the USB when formated to work on this camera (IPOB-TP2IR150L2812-B) it fuctions the same way as the internal Drive of a recorder. The data is not recoverable by means of a computer. You will need to use your network and navigate to the cameras IP and view the footage there, you can also download the footage to your computer. If you do not have network then you can build a cross over cable and navigate to the cameras IP the same way as if it where on a network.
Here is an article:
http://www.securitycameraking......oe-switch/