The Anarchyz said:
If we were talking about some leecher, Sony could still find the data even with a wipe because of the nature of the erasing, you won't believe the things i have found using recovery software and i don't have the resources they have...
But this is George Hotz, i'm sure he did a multiple-overwrite, low-level formatting, cloning sector-by-sector, etc. And of course, leaving things for Sony to find that don't compromise him...
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Finding something that you deleted by just pressing the delete key is trivial. Finding something that you deleted by pressing shift delete is harder but doable with time and money. Finding something that you delete and write over three times is doable but takes A LOT of money and time. From there it just takes more and more time and money to recover things.
The government uses a wipe method that writes over data seven times. There are file wipe programs that write over deleted items 35 times which is pretty much virtually impossible to recover after that. It could probably be done, but it would take years and an insane sum of money to do.
As for if George wiped his hard drives before hand, it depends if he had time. I have no idea how much warning he had but I assumed it was actually a surprise that Sony was able to get his computers held. I know I had to wipe a laptop after an internship using the 35 wipe method (3-7 would have been fine, he decided to go overboard not realizing how much time it would take) that was only 60 gigs and it took all day. I imagine he has more than 60 gigs of data.