Okay, I can see that much.
I still don't understand why a hard drive has to be erased to replace it?
I don't have much experience with surveillances systems, per se, but I've replaced a LOT of hard drives over the years.
And this was never a thing -- except that you'd erase a drive with secure info to dispose of it. Is that what they meant? Because it seems like, particularly after the incident, you'd hang onto that data.
Unless you were intentionally destroying evidence, of course.
So was this document essentially a lie to try to make an intentional deletion look like some kind of technical limitation? 