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Blackbird
Built for Speed
Premium
join:2005-01-14
Fort Wayne, IN
kudos:3
Reviews:
·Frontier Communi..
reply to antdude

Re: Securedly erase memory cards?

It may be that the program methodology for securely erasing them causes so many write operations that it "wears out" the limited number of lifetime writes for flash technology... in which case, there would be no "good" way to just "wipe" them. I'll leave it for an expert to pronounce authoritatively on this - but it is something that I've seen asserted elsewhere in months gone by...
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“The American Republic will endure until the day Congress discovers that it can bribe the public with the public's money.” A. de Tocqueville



StuartMW
Who Is John Galt?
Premium
join:2000-08-06
Galt's Gulch
kudos:2

Flash memory usually has bulk (entire chip) and sector/page erase functionality. Depending on whether they use NAND or NOR cells they're programmable on a block or individual word basis. Cells have to be erased before being (re)programmed so there's constant erase/program cycles no matter what data you write.

PS: I've written a bunch of code over the years to do all this. Some chips/devices are easier to manage than others.
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Don't feed trolls--it only makes them grow!