[GLLUG] Read only?

James Dutton james.dutton at gmail.com
Tue May 24 16:05:35 UTC 2022

On Tue, 24 May 2022 at 12:29, John Hearns <hearnsj at gmail.com> wrote:

> Talking about SD cards, the satnav on my Volkswagen used a full size SD
> Card.
> I bought an up to date SD card - which is not read by the system in the
> car.
> It turns out there is something called CID Locking - the manufacturer is
> encoded as a CID number on the SD card.
> Any other type of SD Card even though it has a valid filesystem does not
> have the manufacturer CID and is rejected.
> I read that you cannot use a USB card reader to set or reset the CID.
> Does anyone have ideas?  Desktop PCs with 'real' SD Card readers must be
> rare as hens teeth these days.
> ps. I have used a USB SD Card reader under Fedora Linux
There are some SD cards that can have the CID reset. If you know what you
need it set to, you can maybe set it.
You used to be able to do it with Samsung EVO Plus 32GB MicroSDHC cards.

Kind Regards

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