Strange SD Card Problems

[RTP]

I finally managed to boot from a 32GB card. How did I do it? First I wrote the image to a new card. It did not boot... Then I tried again, this time pressing on the SD slot from the outside. I will check with my calipers later if that old 16GB card is actuall slightly thicker than the new ones...

That does sound a bit odd. But sdcards are finnicky ime.

Try overwriting it with random data instead of /dev/zero.

Use:

Code:

sudo dd if=/dev/urandom of=/dev/mmcblk0 bs=8M status=progress

After doing the above random overwrite, flash your image again. If the card is still alive it should work (not the same longevity as other storage). I had an issue where overwriting with 0's booted the previous OS, or wouldn't boot. Since using /dev/urandom I have had no problems, and for one reason or another, seems to fix most sdcard issues others have had.

Hope this helps.