My son's MacBook Pro hung and would not reboot. White screen, then turned off. Command-R repair got many, many errors - then finally said: Error: Disk Utility can't repair this disk. Back up as many files as possible, reformat the drive and restore your backed-up files.Wouldn't you know it, my son has no backups other than the ones on this damaged disk. Before I format the drive and reinstall Mavericks, how do I get his backup zip file (and as many other data files as I can) off of the damaged HDD and onto my USB flash drive? I do not see any way to mount the drive and copy stuff off...???