[notacoward]

> I was talking about what you can do with dual actuators, not product lines that already exist.

Since you didn't know they're different until a moment ago, you were talking about both. Don't gaslight.

> Each head, even at peak transfer rate, uses less than half the bandwidth of the external interface.

So two will come damn close ... today. With an expectation that internal transfer rates will increase faster than standards-bound external rates. And the fact that no interface ever meets its nominal bps for a million reasons. Requests have overhead, interface chips have their own limits, signal-quality issues cause losses and retries (or step down down lower rates), etc. Lastly, request streams are never perfectly balanced except for trivial (mostly synthetic-benchmark) cases, and the drive can't do better than the request stream allows. There are so many potential bottlenecks here that any given use case is sure to hit one ... as actually seems to be the case empirically. Your theory remains theory, but facts remain facts.