One of our FP1 shows exactly the same symptoms as those desctibed by @Toonhere, and which apparently weren’t solved at the time.
After reboot and when going to settings>memory, at the bottom of the panel there is a brief flash on the SDCard line, saying the card is analyzed, and then card mentions just disappear, replaced by the ‘insert card’ wording corresponding to a missing card.
We did this with various cards, formatted variously (we never reach the stage where one could actually format the card from within the FP1); the behavior is similar whatever the card, including the ‘good old one’ that was used for years, and a brand new one.
(both can be perfectly read/written on any computer.)
Is this a hardware failure related to the microSD interface?
Is there a way to clean it?
(on the FP1 the contacts are totally out of reach for me, but there may be a way to dismount the metallic caging atop of them?)