I have made several images/clones of my SD disk from my Raspberry Pi. I have used the dd method via the Mac terminal, I've used the disk utility via the desktop. I found directions from other postings. I've copied the syntax correctly and the creating of the image shows bytes transferred and completes without failures. All looks good. Then when I go to restore the clone to a newly reformatted SD disk (using the SDformatter app.) then either via terminal or the Mac disk utility I try to restore the image I run into problems. From Mac disk utility I get an error "Could not validate source - Invalid argument". Using the terminal (sudo dd if=~/Desktop/raspberrypi.dmg of=/dev/disk2
) verified the location of the sd disk by diskutil list. It takes about 3.4 hrs to copy over (32GB SD). When I unmount the disk, then put it back in the card reader I get the message ~ Cannot verify or recognize the format...
What would cause the image to be unusable for restore?