Mac OS X notes

When you try to restore data from a drive that is automatically mounted when you connect it, then unmount it with 'diskutil'. This situation can happen when you connect a drive with a valid file system. Maybe after an unwanted fresh formatting.

Just figure out the device name with 'mount'.

Sample output:

/dev/disk0s2 on / (hfs, local, journaled)
devfs on /dev (devfs, local, nobrowse)
map -hosts on /net (autofs, nosuid, automounted, nobrowse)
map auto_home on /home (autofs, automounted, nobrowse)
/dev/disk6s2 on /Volumes/Untitled (hfs, local, nodev, nosuid, journaled, noowners)

The affected partition is '/dev/disk6s2 (/Volumes/Untitled)'.

Unmount the partition with 'sudo diskutil umount /dev/disk6s2'.

Now you are able to access the partition with hfsprescue.

Example: sudo hfsprescue -s1 /dev/disk6s2

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