Hello,
My only MMC vs. SD experience was, that I couldn't read an SD card throughmy cheap, usb-connected memory card reader.
Did you try to access it as "USB mass storage" device?I do not have such a reader so I cannot confirm it, but some people said it worked for them.
I think it is marketspeak for write protection :). In case of SD cards it is implemented the same way as in vintage 3.5" floppies (i.e., mechanical switch).I sold it, bought an MMC card and that works. Actually, I have no idea what the "Secure" word stands for in "Secure Digital".
Best, Chris -- Krzysztof Wilk chris@gridwisetech.com Gridwise Technologies http://gridwisetech.com Grid Consulting and Training Serving US and Europe