linuxman wrote:Have you checked to make sure the write protect switch is not set on it? There's a little slider switch on the side of the card. Move it toward the flat (top) end of the card to make sure it's writable.
The protect switch would not stop the computer from working
Well, in the broad sense, yes if I was writing the software in a cpap machine I would report an error to that effect if the card wasn't writable. That doesn't mean they did that when they designed this particular machine. It's quite possible it could just shutdown if the card wasn't writable, particular if the SD card was deemed a critical function. Yeah, it's unlikely, but quite possible.