Macro-economic consequences of Moore's law?

By: Ricardo B (ricardo.b.delete@this.xxxxx.xx), April 21, 2017 9:35 am
Room: Moderated Discussions
Ireland (boh.delete@this.outlook.ie) on April 21, 2017 7:43 am wrote:
> David Hess (davidwhess.delete@this.gmail.com) on April 21, 2017 7:36 am wrote:
> > Ricardo B (ricardo.b.delete@this.xxxxx.xx) on April 19, 2017 6:31 pm wrote:
> > >
> > > Third, powering a 7200 HDD is not difficult.
> > > Existing 7200 2.5" HDD consume only 1100 mA @ 5V.
> > > Even an USB 2.0 port can provide 2000 mA @ 5V.
> >
> > The increase in available power for USB 2.0 was through engineering change notices issued
> > years (10!) later. In practice, it cannot be assumed that USB 2.0 ports support more
> > than 500mA which is why many external USB 2.0 hard drive enclosures had provisions to
> > use two USB ports; 500mA is marginal or too low for many 2.5" hard drives.
> >
>
> David,
>
> I think what the makers of a lot of laptops were doing, was installing some custom firmware on their 5,400 rpm
> drives, that down-clocked them down, to fit just inside the 'knife edge' threshold of the 500mA rating.


(1) As David pointed out, HDD enclosure manufacturers dealt with the 500 mA limit by adding a 2nd USB plug.

(2) USB Ports which cannot provide 2000 mA have been rare for a long time; so are the enclosures with 2 plugs.

There's no evidence that laptop manufacturers ever bothered to restrict HDD power to 500 mA for any reason. Except to fit your wild claims.

As I've pointed out multiple time, the power draw from HDD is a second order concern in a laptop's power budget.
It's true now and it was even more true in the past, with much more power hungry CPUs.
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Macro-economic consequences of Moore's law?Foo_04/19/17 01:20 AM
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