you could try installing ubuntu onto your ps3 as a secondary OS. Should have access to the whole file system>>>>>>>>
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Another thought.... you could remove your hard drive and place it in an external case with power and connect it to a laptop using a crossover cable then connecting the laptop tp a pc via a "shared Network" connection, then the pc should be able to read it as a mass storage device connected to the laptop....... maybe
if this works let us know please