I just ran onto a weird problem with the SD card.
I have 2 cards, the original 8MB supplied by Technics and a 128MB Sandisk card. Both have worked OK in the KN7000 and in the Cruzer SD card reader on the PC.
However, when I tried to look at the Kn7000mn.inf file with the Hex Editor, It would not read the .inf file on the 8MB card. The error message was that the disk contained a FAT12 volume. What was weird is that the hex editor has always read FAT12 files (used on floppies).
I tried formatting the card using the KN7000, saved a few files, and had the same problem.
The answer was to format the card using the PC and then form the file structure (Private/Technics/Kn7000)using the PC. After that, everything was back to normal.
I don't know what happened, but that was the only way that I could recover from the problem.
Note that I could always read the files on the PC using Windows Explorer, so if you run into this problem, simply copy your SD card contents to a temporary folder on your PC hard drive, re-format the card and then copy the folder structure and files from the hard drive back to the SD card.
I hope that this helps anyone else that runs into unexplainable problems with the SD card.
Walt