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Old 08-14-2019, 05:13 AM   #1
vincix
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Registered: Feb 2011
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safely erase SSDs


I'm erasing a Samsung SSD 850 EVO using the following two commands:
Code:
hdparm --user-master u --security-set-pass PASSWORD /dev/sdb
hdparm --user-master u --security-erase-enhanced PASSWORD /dev/sdb
The second command runs almost instantenously. I understand that with the newer SSDs the data is nonetheless somehow encrypted and the only thing that needs changing is the encryption key (sort of) and maybe run a TRIM command (which would take a few seconds), and by doing that, the data becomes automatically illegible.

The problem is that hdparm -I displays different times for the security-erase, which are not even nearly close to what is actually going on. In my case it says:
Code:
2min for SECURITY ERASE UNIT. 8min for ENHANCED SECURITY ERASE UNIT.
If the process is supposed to be instantenous in the first place, what do these number mean anyway? Why are they there in the first place?

Thanks in advance!
 
Old 08-14-2019, 10:15 PM   #2
frankbell
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I have no personal experience with SSDs, but this article from the Arch Wiki might help: https://wiki.archlinux.org/index.php..._cell_clearing
 
Old 08-15-2019, 05:07 PM   #3
vincix
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Hi,
Well, I've already checked the link and there's no exact explanation as to why it takes so little time to run and the command and why it says it's going to take several minutes.
 
  


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