![]() NVRAM has a limited amount of write cycles available. Never overwrite an SSD/flash storage device completely in order to erase it, except as a last resort. Read the blog entry for more details or submit your own Question of the Week.īest stop doing that. This question was IT Security Question of the Week. (I start it in the evening, and stop in the morning, e.g.: it overwrites my USB flash drive 10 times): loopcountdd=0 ĭd if=/dev/urandom bs=4096 | pv | dd bs=4096 of=/dev/XXX Here is what I use to regularly delete the data from my memory cards, USB flash drives, etc. But how about SSDs and USB flash drives? Do I have to wipe the data on them 9 times, or is it only needed once? So it's ok to wipe the HDDs at least 9 times as mentioned. (Each pass involves 3 separate writes followed by a verify pass.) This helps eliminate the potentials for the recovery of Shadow Data." Can overwrite ambient data areas 9 times. "Conforms to and exceeds the Government Standard set forth in DoD 5220.22-M. According to the documentation for the "diskscrb" command for wiping conventional hard drives:
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