The second you write over data on a hd once the data is no longer available to software recovery. The only way it can then be retrieved is with very sophisticated hardware which will scan the edges of the tracks and try to pick up data left there. (not your average ebay crook)
This stuff costs a lot of money, and I would put money on the fact that the quality of what is found will not be the greatest. 2 or 3 passes and the level of difficulty increases exponentially.
Overwriting Hard Drive Data ę SANS Computer Forensics, Investigation, and Response
Once you have done a 1-Pass wipe the chance of getting any meaningful data back by software is nil, with Magnetic force microscopy the likelihood is so infetesimal it is not worth worrying about. In fact the odds of guessing if a bit is 0 or 1 is 50:50 so you would probably have more luck guessing the bits required in which case you can recover the data without seeing the drive!
Remember a 1KB file is 1024 bits in the table below
Last edited by somabc; 23rd March 2009 at 02:05 AM.
did anyone actually read the article? It says:
- ie the BBC article clearly recognises that you don't need to physically destroy the disc, you can just use software to clear the drive completely. they do go on to show that smashing the disc does make the data unrecoverable (it does!) but they don't claim that you need to do that.While Which? recommends smashing hard drives with a hammer, experts say for most consumers that's a step too far.
Criminals source old computers from internet auction sites or in rubbish tips, to find users' valuable details, and a number of recent cases have shown the dangers in disposing of second-hand equipment.
A number of software solutions exist to more definitively erase files and information.
All our hard drives are chopped into 3mm square cubes along with the rest of the PC!
Another method for quickly, and safely destroying the disk is to simply drill through the platters, a couple of holes and job done. But much simpler to use disk erasing software, though maybe not as quick.
Pfft, you lot are looking too far into it.
They make great coasters!
Could be handy to put them into the foundations of the schools new extension
Last edited by ICT_GUY; 24th March 2009 at 03:28 PM.
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