Steve, thank you for a very useful summary.
How do you respond to "respawns", who said "With the ongoing fight against
global warming, things like keeping your computer on standby ain't helping,
it's still using up to 80% of the power it would if it was on, so why not
just wait another .40 seconds and do everyone a favour."? I accept that
Standby mode (which I do not use, and would not now that I have read your
notes) still incurs some power usage, but I would have thought it was
minimal and nowhere even near 80% of normal usage.
--
Lindsay Graham
Canberra, Australia
---------------------------------------------
Please reply only to the list/newsgroup so that all may benefit.
"Steve Thackery" <> wrote in message
news:uDNj$...
> I think there's some confusion amongst the other contributors here,
> because the question was about "sleep" and the answers were about
> "standby", which are different things.
>
> Let's just quickly go through them:
>
> "Shut Down" closes down all applications, the OS, and powers off the whole
> computer*. When you restart, you go through the BIOS startup, and then
> boot the OS to an empty desktop.
>
> "Hibernate" writes the current state of the OS and open applications to a
> disk file. This takes several seconds. It then powers off the whole
> computer (like Shut Down does). When you restart, the computer goes
> through the BIOS startup but then, rather than booting the OS in the
> normal way the operating state is reloaded from disk, which again takes
> several seconds. You are then presented with your applications open, just
> as you left them.
>
> "Standby" shuts down most of the computer (hard disks, processor, fans,
> screen), but leaves the memory powered up, along with some of the
> peripherals. It's rather like "freezing" your computer at a moment in
> time. It is quick: it doesn't require the current state to be written to
> disk. Resuming from standby is also quick: effectively it just "unfreezes"
> the processor and carries on from where it left off. It has one major
> disadvantage: if the power is removed whilst the computer is in standby,
> the operating state of the OS and applications is lost. This can lead to
> data loss.
>
> "Sleep" is a new mode introduced with Vista, and it's a clever combination
> of Standby and Hibernate. "Sleep" writes the current state of the OS and
> open applications to a disk file - just like Hibernate - which takes
> several seconds. But then it effectively puts the computer into standby -
> that is, it shuts down most of the hardware but leaves the memory powered
> up. Provided the power remains on the computer whilst it is "sleeping", it
> can resume almost instantly, because the operating state is preserved in
> memory and it just "unfreezes" the processor, like resuming from the old
> Standby. If the power should be lost whilst the computer is in Sleep, no
> data is lost because the operating state was saved to disk. In this case
> the computer goes through the BIOS startup and then reloads the operating
> state from the disk file, just like coming out of Hibernate.
>
> "Sleep" is wonderful: it allows an almost instantaneous resumption to your
> open applications if the power was not interrupted. If it *was*
> interrupted, it still resumes to your open applications, but it takes a
> little longer.
>
> To answer your question:
>
> 1/ The supposed effects of starting and stopping your hard disk, as
> opposed to running it 24/7, are NOT well established, despite what a few
> opinionated but ill-informed hot-heads in this newsgroup will tell you.
> There is no *conclusive* data to suggest which is better for disk life
> (you might like to look at the research Google have done in this field),
> or the life of the other electronics.
>
> 2/ Powering down your computer will definitely save energy, though.
>
> 3/ The best way to power it down by far is the new "Sleep" mode in Vista,
> which is the default function of the "power button" icon you can see when
> you click the Orb. It allows an instant resume if the power was
> uninterrupted whilst the computer was "sleeping", and a pretty quick
> resume if the power was removed for some reason. I recommend it.
>
> I hope this has been of some help.
>
> SteveT
>
> *Strictly speaking, even when "fully switched off" using the power button,
> parts of the motherboard remain powered. This allows it to respond to the
> power button on the front of the case.