Data recovery (was: Re: SETI at home (ca. 2000) servers heading to salvage)

[Paul Koning]

> On Apr 4, 2022, at 10:55 AM, Warner Losh via cctalk <cctalk at classiccmp.org> wrote:
> 
> That's what a sanitize operation does. It forgets the key and reformats the
> metadata with a new key.

Yes, but the devil is in the details.  For example, for the SSD case, it is necessary verify that the flash block that previously held the key information has been explicitly erased (successfully) and not merely put on the free list.  That's a detail I once pried out of a manufacturer, insisting they were required to answer in order to get the business.

	paul