Your SPT2 GPS is not a USB memory stick. To get GPS files from the device, and to erase the device you will need to install Bridge on your computer.
Please follow the link below that corresponds with your operating system to download the Bridge.
If you are using SPT1 devices, please follow the appropriate link below:
Important information:This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause undesired operation.
Warning: Modifications to this unit, not expressly approved by the party responsible for compliance, could void the user's authority to operate the equipment.