I was trying to reformat some microSD cards last night. They are apparently writable, mount rw. I umount them, use (CAREFULLY) dd to write /dev/zero or /dev/urandom on to them and dd seems to happily do it. I can even hexdump back out the zeros or whatever back out, for a short time. But moments later, all the original content is still there.
I have tried multiple computers, two different microSD cards, multiple distribution versions, interface adapters, including your usual USB adapters and mmcblk adapters, same result. It isn't a write protect slide switch, because there aren't any in some of those adapters and anyway, in the case where there was one, it was in the correct position. Anyone know what's going on? -- Russell Senior [email protected]
