Michael wrote: > On Sunday, 21 June 2020 00:08:55 BST Wols Lists wrote: >> On 20/06/20 23:14, Neil Bothwick wrote: >>> It sounds like it may be filesystem corruption. With an SD card I'd >>> either reformat it, preferably in the device that will be using it, >> If that's possible ... :-) >> >> I now have two devices, my car radio and a tv, both of which require the >> vfat filesystem. New cards seem to come with exFAT. And of course >> neither the radio nor the tv have the option to format a card ... (and >> Windows has deleted the "format as vfat" option). Thank $DEITY for >> mkfs.vfat :-) >> >> Cheers, >> Wol > There may also be a lock switch on the card itself or an SD card adaptor, if > connected to the PC using an adaptor, although I expect Dale would have > noticed that feature and unlocked it. Sometimes the lock switch is faulty > and > will only make contact half way through, switching back to read only at the > fully unlocked position - they don't make things as they used to anymore. :( > > Let's not forget corroded electrical contacts - I've had that happen with a > USB stick, which accidentally fell in a cup of coffee. LOL! The coffee > corroded the copper, but the problem only became apparent intermittently a > week later. Cleaning the contacts with fine wire wool and blowing away all > swarf followed by a wipe with methylated spirit allowed me to access my files > again. > > To eliminate PC/adaptor problems, reinsert the card in the camera device it > came with and delete/format it there. If it still doesn't work, RMA it under > warranty, or buy a new card, of a different make. Then tell us all what make/ > model it was, so we can all avoid it! LOL! > > PS. exFAT has made it into the latest Linux kernels.
I did check the lock switch thing, not that I even would lock it. I'm certain it hasn't been locked since the cameras can write to them. Next time I swap cards, I'll reformat them. Give that a try. The cards are Sandisk but I've had them a good while. At times, I've had over a 1,000 images or over a hundred video files on the cards. One camera takes pics while the other takes videos. Still weird tho. Dale :-) :-)
