<div dir="ltr">Talking about SD cards, the satnav on my Volkswagen used a full size SD Card.<div>I bought an up to date SD card - which is not read by the system in the car.</div><div>It turns out there is something called CID Locking - the manufacturer is encoded as a CID number on the SD card.</div><div>Any other type of SD Card even though it has a valid filesystem does not have the manufacturer CID and is rejected.</div><div><br></div><div>I read that you cannot use a USB card reader to set or reset the CID.</div><div>Does anyone have ideas? Desktop PCs with 'real' SD Card readers must be rare as hens teeth these days.</div><div><br></div><div>ps. I have used a USB SD Card reader under Fedora Linux</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 24 May 2022 at 12:24, James Dutton via GLLUG <<a href="mailto:gllug@mailman.lug.org.uk">gllug@mailman.lug.org.uk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Flash devices go read only when they detect themselves that they have a fault. <br><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr"><br></div><div dir="ltr" class="gmail_attr">SD cards are not particulary reliable.</div><div dir="ltr" class="gmail_attr">So my best guess is that this has happened to your sd card.</div></div></div>
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