I did read that, but frankly it did not solve my problem.
I don't have access to a windows computer, but I have access to a local library, so maybe I can try that.
Every card I format in the 661 is unreadable by the 620.
I may try formatting a card in the 620 and seeing if it works in the 661, but basically, if the 661 is going to be this picky, give me a blank card with an invisible file on it, it is useless.
Frustrating.
My last one was a tank that gave me no problems.