Basic Data Recovery on a MAC Laptop Hard Drive gone/going bad in single-user mode

If you have a hard drive going bad that you need to salvage data off of because you can not boot the operating system and do not have a lab or other required hardware or software required to do advanced recovery, there is another way to do this.

1. Boot into single-user mode using Command-S (hold down and power up).
2. Type: /sbin/mount -uw / — we need the drive out of read only mode so that we can create a mount point.
3. Type: mkdir /Volumes/usbbackup — create our mount point location
4. Type: ls /dev/disk* — we need to find our USB disk. This normally should be /dev/disk1s1 if you have nothing else plugged in. disk0 is your main HD.
5. Type: /sbin/mount_msdos /dev/disk1s1 /Volumes/usebbackup — this will make /Volumes/usbbackup access and use our USB drive.
6. Type: cp -Rn / /Volumes/usbbackup — this will copy the entire drive to your USB drive. You can replace / with specific directories if you wish to backup specific items.

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