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On 9/30/2023 3:51 AM, Martin Brown wrote:
> On 30/09/2023 00:27, gggg gggg wrote:
>> Is there a simple command that will wipe out all info/data?
>
> There are various tools that will fill the disk with random data
several times
> over. That won`t quite work against a forensic specialist if the data was
> valuable but should be good enough for all practical purposes.
It`s actually possible to get "residual data" from SSDs (and,
likely, rust). We think of magnetic/electrical domains as
binary things but they really are analog and can be probed
to reveal more of their history.
For the skeptics:
<
https://www.usenix.org/system/files/sec20_slides_hasan.pdf>
And, of course, "broken" drives (of any type) are relatively easy
to snoop.
> They tend to be called something like shred. This advice looks OK
>
>
https://uk.crucial.com/articles/pc-builders/how-to-wipe-a-hard-drive
>
> SSD`s present a bit more of a challenge there can be orphaned blocks with
> faults that contain your data frozen and inaccessible by normal
means but which
> could be retrieved by a forensic specialist with the appropriate tools
> (basically hidden in bad blocks or by wear levelling).
The same is true with spinning rust; you don`t know *when* a sector
was marked as bad so you don`t know what it might "partially" contain.
For picky customers, the presence of *any* bad blocks on a drive
at the beginning (or end!) of our "sanitizing" procedure requires
the drive to be physically destroyed -- because there is no way
for us to coax the drive to scribble on/over that "bad" sector, to
obfuscate its contents.
[Disks are cheap. If you have concerns over your data being exposed,
they are considerably cheaper than the cost of potentially losing
control over that data!]
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