"T" in this case is short for "Thumb" sorry for the confusion......
Longshadow wrote:
If it worked before, it sounds like something on the card got corrupt. Yes, reformat.
"T:" is not necessarily unique to that fob, unless maybe if you mapped it.
I have different devices that I plug in at different times and they get assigned the same letter as "others" have had, like F: or J: or L:.