- Plus the TF card to the Mac
- Run ‘diskutil list’ to confirm the name of the TF card, such as ‘/dev/disk2’
- Run ‘diskutil unmountDisk /dev/disk2’
- Backup ‘dd if=/dev/disk2 of=/path/backup.img’ without compression.
- Backup ‘dd if=/dev/disk2 | gzip -c > /path/backup.img’ with compression
- Restore ‘dd if=/path/backup.img of=/dev/disk2’ without depression
- Restore ‘gunzip -c /path/backup.img | dd of=/dev/disk2’ with depression
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