I added a new set of gpsfiledepot.com maps to my eTrex 20 last night -- not to the unit itself, but to a micro SD card. Plugged the card in and, yes, the new maps are there.

Unfortunately, I lost two important sets of data -- a .gpx track and all of my cached routes (80 or so).

I have the .gpx saved on my computer but when I put it onto the SD card it's not showing on the unit. When I plugged the eTrex 20 into my computer I got an error message on the GPS I have never seen before: "The USB cable is connected to the wrong adaptor". The GPS does show up on my computer.

The old tracks are nowhere to be found.

So -- what does the message mean? Why does the .gpx track not show up? What happened to my carefully cultivated set of cached tracks? Thanks for any help.