Recover files on unmounted partition

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http://unix.stackexchange.com – I have 2 partitions on my macbook, but I can't mount one of them. When I run the disk utility, the console (show details area) returns the message: Updating boot support partitions for the volume as required.Error: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files. I need to recover my files that are on the unmounted partition. Is there a way to list and recover these files without mounting the partition? (HowTos)