Times until the hourglass is gone with the card empty. Shown smallest to largest in the table. Secondly, the card is interfering with the review and delete function on the camera. Don can't use the garbage can to delete shots after review and can't pause the picture using this card only. What is wrong remains to be seen, but Lexar is apparently aware of the problem and may allow exchange of your card.
Some reports say that only the non-USB version of the cards seem to have the problem.
I don't know how you can check the firmware yourself, sorry. Corey sent his USB Lexar 80MB in to Lexar for replacement. This is the replacement card, and it is performing up to specifications now. I have good confidence in Ernie's timings, note that the 10X lexar card does not seem any faster than the 8X card in the 990. It will be interesting to see more 10X card timings.