There are rumours of cheap Chinese SD cards that don’t follow the official spec and allow you to change to them – I now have large pile of cheap Chinese SD cards on my desk, but unfortunately none of them did allow it. ![]() For example, if you want to change the supposedly read-only ID on various kinds of RFID tag you can simply buy a special version from China that allows it (often referred to as gold or magic cards). ![]() There is surprisingly little info out there about this, when it’s easy for other devices. I’ve spent a while trying to work out how to change the ID on some cards. ![]() This can result in you being stuck with a smaller card than you’d like in a device or not being able to use a backup in case of damage. (tl dr – skip to bottom for instructions, see also update post) The CID register on SD cards is supposed to be read-only, which means it can be used to lock devices to specific SD cards, preventing the user swapping them out, which is very annoying.
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