[Bglug] Secure erase of an SSD different from HD

William Park opengeometry at yahoo.ca
Thu Dec 31 01:38:52 EST 2015


My Samsung 850 EVO 500GB says
    - 2min for regular erase -- 4GB/s
    - 8min for enhanced erase -- 1GB/s
So, you are right.  I was remembering HDD...
-- 
William

On Thu, Dec 31, 2015 at 12:27:48AM -0500, Remi Gauvin wrote:
> On 15-12-31 12:08 AM, William Park wrote:
> >
> >Speed-wise, though, "hdparm" method is about the same as "dd" method.
> 
> I can't speak for every SSD out there, but for all the models I've used,
> that's not remotely true... a secure erase is almost instant, (about 5
> seconds, usually,). dd still has to write out the 0's, and will burn a write
> cycle off the life of your device while it's at it.
> 
> 
> Not the same case for HDD's however, an HDD still has to physically write
> 0's to the entire disk surface.

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