Thanks for the tip, lufa. I finally got the sequence of actions right and have been able to format, load, and install both Lexar and Sandisk micro SD cards up to 258 Gb. It's a unique sequence quite different from the old, U1000 that I was used to. The desktop viewer is also quite a change from the old version but "it is what it is" until something better (and simpler) comes along. Being a strong proponent of "KISS", I find that the Thinkware website is quite convoluted in that it takes a lot of poking around to find the actual instructions for installing a new card (or just about anything else for that matter).