Hi Hans,
This *might* fall into the category of ruling something out. But your second post made me think it could be worth a pre-test, of your various SD cards, 'commercial' and 'industrial', using the PC-based 'h2testw' tool, available for example, at https://www.portablefreeware.com/?id=1519.
I know from the web and experience, that some cheaper SD cards have less capacity than they report, and are sold as. And this includes SD cards that are badged as from reputable manufacturers, but are infact clones. And this is not apparent until an attempt to use the card in excess of its actual capacity. For example, on writing a large number of files, in which case some go AWOL. Or with a single large file, in which case it reads corrupt, or not at all.
The tool does take a while to run. But it writes 1MB files with various values to all reported available locations, and when done, reads back and checks the file values were as written. It's non-destructive, unless the card has issues, in which case data can be lost, so backup first. You'll need of course an SD port on your PC or eg USB-to-SD-port adaptor..
Best regards,
David King
This *might* fall into the category of ruling something out. But your second post made me think it could be worth a pre-test, of your various SD cards, 'commercial' and 'industrial', using the PC-based 'h2testw' tool, available for example, at https://www.portablefreeware.com/?id=1519.
I know from the web and experience, that some cheaper SD cards have less capacity than they report, and are sold as. And this includes SD cards that are badged as from reputable manufacturers, but are infact clones. And this is not apparent until an attempt to use the card in excess of its actual capacity. For example, on writing a large number of files, in which case some go AWOL. Or with a single large file, in which case it reads corrupt, or not at all.
The tool does take a while to run. But it writes 1MB files with various values to all reported available locations, and when done, reads back and checks the file values were as written. It's non-destructive, unless the card has issues, in which case data can be lost, so backup first. You'll need of course an SD port on your PC or eg USB-to-SD-port adaptor..
Best regards,
David King