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And To Paul's 1010101 etc patterns I do believe that 00000000 and 11111111 are the only patterns the DOD requires. I dont' have the link handy but I seem to recall that was all they wanted. On the temperature comment that is likely true. You'd need to have the system shut down and good and cold, fire it up, and write like crazy! Then get it good and ot and do it some more. Not so sure that's work the effort!
- Larry Vernon Hamberg wrote:
Just to be cantankerous - a physical file has a bunch of overhead stuff that will never be touched by this process - every data space has a segment header, etc. Even stuff in the IFS contains this stuff - so there'd be SOMEthing always left over that is not wiped.I think! Heh! At 07:57 PM 1/18/2007, you wrote:To be even more effective you need to write more bit patterns: 01010101 10101010 And just for fun: 00110011 11001100 etc. etc. I think the DOD requirements include bit patterns and a number of over-writes. Or a sledge hammer or drill! As I understand the problem with erasing disks, it's the thermal expansion and contraction that causes incomplete erasure of the edges of the tracks-- because the heads aren't perfectly aligned with the track. And those 'fringes' are the bits (: that can be read under extremely special circumstances. So maybe you need to chill the computer room to near-freezing, run the program, then let it creep up to 100 degrees or so and repeat, just to get the fringes! In any event: Write etirW repeat --Paul E Musselman
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