Obscure error: dd: failed to open: No medium found
This blog post was published 10 years ago and may or may not have aged well. While reading
please keep in mind that it may no longer be accurate or even relevant.
I got this error message when I wanted to use dd to copy a raw image to a MicroSD card. You will see this message if you have unmounted the card with a file manager like Nautilus.
The fix:
Unmount the card via the terminal:
umount /dev/sdd1
The dd command will work now.
Another variant of this error can be seen when using bmaptool:
bmaptool: ERROR: cannot open destination file '/dev/sdd': \[Errno 123\] No medium found: '/dev/sdd'
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