The diskutil said that my SD card is located on /dev/disk4, so I typed

sudo dd if=/dev/rdisk4 of=~/Desktop/backup.img bs=1m

to backup my SD card. But there is a message

dd: ~/Desktop/backup.img: No such file or directory

What's the problem?

  • Does the ~/Desktop/ directory exist? Commented Jun 17, 2017 at 15:50
  • @SteveRobillard It exists. The command works as I change to the target directory and replace it with sudo dd if=/dev/rdisk4 of=backup.img bs=1m
    – jcwu
    Commented Jun 21, 2017 at 7:15

1 Answer 1


If you are using sudo i.e. running with root permission you DO NOT have ~ as shortcut for your home directory.

Use FULL PATHS or cd to the target directory.

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