Oh crap.
Tiny smidge plastic part from the front corner of a #sdcard came off. My SD card reader recognises it all right and let me pull the files off, but the camera (Nikon D780) doesn't think the card is inserted any more.
I think this is the *second* Sandisk Extreme 128GB I've used had that failed. Though admittedly this is the first time I've seen that the SD card body itself causes a problem, usually it's contacts going bad or flash getting worn out. Starting to think these aren't as Extreme as they claim to be.
Guess I have to grab more SD cards when I go to the towne





