The problem is the same as with “theory”: you use the colloquial definition to name things, then try and enforce the consequences of the technical definition.
Interestingly enough, there are HDDs purpose made for surveillance (eg. WD Purple), and their special feature is that they’re dumb as bricks: since surveillance more or less continually writes, and only really reads when user directed, there’s practically no start-stop-move head, no predictions, no sleep, no need to cache system files… Just write-write-write in a line, then when you run out of space, start over.