marco scafidi posted an answer for this Toshiba Satellite C655D-S5044 15.6" 2GB RAM 320GB 6 Cell Battery (PSC15U01L010) PC Notebook:
"probably the hard drive in your laptop is gone. try booting ubuntu in live mode, so..."
marco scafidi posted an answer for this SimpleTech 120GB SIMPLEDRIVE PORTABLE USB 2.0 DESIGNED BY PININFARINA 120 GB Hard Drive:
"if the plug is getting loose you probably can't repair it the only thing you can do is to..."