Tim Jackson wrote
Whatever you like to call it. It has nothing to do with head
calibration, it's the zone of the disk under the ramp where the heads approach the disk and establish a stable flying
height.
Wrong. There was no ramp initially, that came later to avoid
stiction which happens due to the very smooth platter and head
and the heads never ever deliberately contact the platter anymore,
because the heads dont get anywhere hear the platter from the
ramp until the platters are up to rotation speed and so the last
thing you want is a head crash. They certainly dont ever
deliberately 'the head hits the disk in order to find it'.
That is utterly garbling what actually happens even with the original PC drives.
Yes, but the heads never deliberately contact the
platter when there is a load/unload ramp in use.
That's not an alternative explanation, it's just a denial.
You're lying now.
If I'm out of date, I'm happy to learn.
You clearly arent. You just try to bullshit your way out of your predicament instead.
I admit it was the 1970's when I worked in computer design, but I do try to keep up.
You need to try much harder.
But telling me it's no longer done like that, it's now done by magic, doesn't help.
I never ever said its dont by magic, liar. That cite you posted clearly states how the
load/unload ramp works and why the heads no longer contact the platters anymore.
I trained as a physicist: I need mechanisms,
That cite you post has the mechanisms, read it again.
Then you will have to find those for yourself.
You dont need the numbers anyway when the heads only leave the
load/unload ramp when the platter is up to speed and the heads just
fly because the platter is up to speed when the head comes off the ramp.
Not until you tell us how they get to descend from unload height to
flying height without touching the disk.
That cite you posted does that, by waiting for the platters to come
up to speed before the heads are moved off the ramp over the platters.
Do the sums yourself then.
No thanks. Its obvious to anyone with a clue that if the platters
are up to speed before the heads come off the ramp, they will
fly when they are designed to fly over the platters.
How long does it take to get from say .001" down to flying height, slow enough that ground effect stops you hitting
the disk.
Not even a second.
Sure. And when they come back off the ramp... ? How high above flying height are they? How fast are they descending?
How much time do they have to stop in?
Find that for yourself.
How far *below* flying height must they get in order to obtain a decelerative force to stop the descent in that time?
You dont know that they do ever get below flying height.
No need, whoever designed them did that and it clearly works fine.
They use observation and/or instruments to predict the approach to the ground and reduce their descent rate.
Wrong again. With light aircraft that have a significant ground effect, you
can close your eyes and use the ground effect to reduce the descent rate.
And dont try claiming it doesnt work like that, I've done it.
If they don't know their relative altitude they are rarely successful at landing on one piece.
Wrong, as always. Some like the F111 are effectively driven into the ground
and the undercarraige absorbs the remaining descent force. They dont flare.
Same thing happens with aircraft carriers, landing is more of a controlled
crash than anything else, there is no flare at all, essentially because there
isnt enough deck with an aircraft carrier and the last thing you want is flare.
And they don't fly at 1.5mm either, they fall many times that distance on landing.
Planes cannot land by ground effect alone.
Wrong, as always.
It would require an impractically shallow angle of approach even to get to a flare height of metres, never mind
millimetres.
Utterly mangled all over again. You just flare and use ground effect then.
And planes do touch the ground, they don't go to level ground-effect flight.
You can if you want to, and some have been designed to do that, usually over water.
I have yet to see a disk slider with elevator flaps, although maybe one day...
Flaps are there to increase the rate of descent and to change the attitude
when descending so you can see better. No need for them on hard drive heads.
And there is no such animal as 'elevator flaps' on a plane anyway.
It says they all did until about 1995,
It ACTUALLY says that the START on the platter when the platter isnt rotating, a different thing entirely.
which is over a decade of PCs, and contradicts what you said.
Like hell it is.
I agree it doesn't discuss the mechanism of approach to flying height, I did say that.
And you mangled it completely.
