You're welcome, I was a bit surprised when you said that it didn't solve your problem since it really seemed to be closely linked.

Et voila ;-) !

I am sorry, I can't help you, since I don't know the USB device very well, but you don't seem to be the only one experiencing this problem...

I know this is not of any help but at least it might...

Your registery might have been modified so that the writing on the usb device is disabled.

Try this :
Enable/Disable USBWrite...