John Denker wrote: > Dave Howe wrote: > >> Hmm. can you selectively blank areas of CD-RW? > > > Sure, you can. It isn't soooo much different from rewriting any > other type of disk. Yeah, I know. just unsure how effective blanking is on cd-rw for (say) a pattern that has been in residence for two years, but now must be unrecoverable.
> There are various versions of getting rid of a disk file. > 5) Grinding the disk to dust. AFAIK this is the only NSA-approved > method. A suitable grinder costs about $1400.00. > http://cdrominc.com/product/1104.asp for most, scratching off the carrier substrate is usually enough - I *might* be persuaded some trace remains on the plastic disc afterwards, but I can't imagine anyone recovering from a disk that had been a) scraped clean then b) thrown into a blast furnace containing liquid iron, or even a small home smelter. However, I am more interested in methods to destroy just a single track at a time, and I doubt you could deface the disk reliably *and* still retain read abilty on the remaining tracks. --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to [EMAIL PROTECTED]