OK!
Problem solved! Thanks especially go to rastasean here, because in retrospect, all the stuff he was saying makes the behavior of the device make sense. (or sense, depending)
tedyun's explanation and the use of the manual, of course, is the fix. Once I was willing to make a new folder, new recordings automatically go to that.
better yet, I was able to take the 2 cards of "blank" recordings, put them in the machine, make a new folder and then MOVE MY RECORDED FILES from the ".trashes" folder to the new folder and save them.
So there you have it.
Now... Is the 8GB SDHC card the new DAT? How much for those DDS tapes vs the 8GB card today?
Can we just buy those cards like tapes and store them as masters?
I think the price is almost the same now!
Thanks to all!