Obscure error: dd: failed to open: No medium found
Caveat Lector: This blog post was published 10 years ago. Depending on the content, it may no longer be applicable or 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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