Seagate 1TB premature failure problem
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If you have just installed any of these new drives Model Number ST31000340AS please check with the Seagate forum for details of a failure that causes the drive to not be recognised by the computer.
See
http://forums.seagate.com/stx/board?board.id=ata_drives
fortunately I had just ensured that I had two up to date back up copies of the system created just before the drive failed.