This will work too and doesn't care about the type 😁
https://youtu.be/wb3Xa1h_RqM
On 5/4/2021 9:47 AM, Robert J. Hansen via Gnupg-users wrote:
Modern harddisks don't allow that anymore. Should I assume that
"low-level format" in this case means something like
dd if=/dev/zero of=/dev/sdX
[puts on forensics professional hat]
Good question! The tl;dr of it is that the technique to wipe a hard
drive will vary according to the kind of technology used in
manufacturing the drive, and to a lesser extent the kind of forensics
nerdery you're afraid of.
This is the origin of the myth of the 30-odd-pass "Gutmann shred". It
was always a complete myth that you needed 30-odd passes to wipe a
hard drive. The 30+ passes were if you had no knowledge about the
underlying technology of the drive and needed to account for antique
FM-coded drives all the way up through modern SSDs. If you were
thinking of doing a 30+-pass shred, the best thing to do was smack
yourself in the face for being so foolish and then go off and read the
label on your hard drive. :)
For modern SSDs I generally recommend a single pass with random data:
dd if=/dev/urandom of=/dev/foo bs=1M
(Don't forget the blocksize [bs] parameter; it can improve speed
significantly.)
This is enough to foil the vast majority of forensic analysis. Yes,
yes, SSDs have remapping capabilities which means certain memory cells
won't get hit even if you do this, and it's theoretically possible for
a good forensics nerd to do all kinds of wild magic to pull off data
you didn't even know was there... but that kind of very high-level
forensics nerdery costs a lot of money, and few people are worth that
kind of investment.
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