We are testing ET1 JB, we tested connecting the device on more XP based PCs. All our XP based PCs are having service pack 3. On some PCs, the device supported storage mode and on others not. We tried every possible way, but it did not connect to all PCs. We are unable to understand this behaviour of the device.
The ET1-JB OS uses MTP ( Media Transfer Protocol) instead of USB Mass Storage Mode. The MTP drivers are installed by default on Windows 7, but on windows XP you must install the drivers separately.
I've found that the easiest way to accomplish this is to install the latest windows media player for XP . You could also install MTP through this method. http://www.microsoft.com/en-us/download/details.aspx?id=19153