>>I don't know the specific SD card you refer to, but I would definitely try it in a USB or internal card reader which can handle SD cards. In principle a SD card is a SD card, the write once feature is most likely done by simply ignoring the write signal once the cells are written to, in hardware.
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>No. Already tried writing via standard digital camera and through a Win7 system with SD port. Error trying to write or disk is write protected error.
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>No problem viewing what is already on the card (image from a camera specifically designed for the SD WORM card).

OK, I see. A write once card is in theory easy to make. But SanDisk clearly has used some proprietary solution in order to make this specific card hard to write to. I'm sorry that I can not provide more help.