Reconstructing RAID

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http://www.unix.com – I am trying to reconstruct a failed 4 disk RAID5 Western Digital ShareSpace device using 3 of the 4 disks connected via USB to an Ubuntu 12.04 machine. I get what seems like a successful re-assemble from - mdadm --assemble --force /dev/md2 /dev/sde4 /dev/sdf4 /dev/sdg4 mdadm: /dev/md2 has been started with 3 drives (out of 4). But then when I try to mount, it fails. I am logged in as root and when I try to troubleshoot with mdadm, I get odd returns such as - mdadm --examine /dev/md2 mdadm: No md superblock detected on /dev/md2. Also, the system can't seem to find the volume - vgscan -v W (HowTos)