was caused by loose connection in my digital set top box -- its a 930 gig HDD I hade family photos & videos - 610gig of all gone computer disk management - says 930gig Unallocated . so this means its Unrecoverable , right ?? Also the drive letter does not show anymore in Explorer- do I have to reformat the Harddrive ?? or is it possible to still recover those 610gig family photo & video ?? and How ??