9 Mar
2004
9 Mar
'04
3:51 a.m.
Hi
Most all hard disk heads will damage the surface if
rotated backwards. This is because the back edge is
sharp enough to cut you as well as dig into the
surface.
Dwight
From: "Johnny Billquist"
<bqt(a)update.uu.se>
On Tue, 9 Mar 2004 Gooijen H <GOOI(a)oce.nl> wrote:
I am not sure that removing the brake will help.
More likely not. In fact, the break is there for a reason. To stop the
drive when spinning down. Otherwise, it will spin for a long time. I also
suspect that the break is engaged until you try to spin the disk up, so
that the disk don't swing back and forth just because you move the drive
around.
I once heard the following rumour:
the brake in combination with the 'heavy' motor
makes sure that the disk platters always rotate
in the same direction, never for a short instance
in the other direction (vibration, power flutter,
whatever reason). Rotation in the opposite direction,
for any short moment, will cause the air on which the
r/w head fly to disappear and result in an immediate
head crash ...
Are you suggesting that a platter, weighting several kilograms, spinning
at something like 3600 rpm, suddenly can change spin direction at a
millisecond notice?
As I said, it is a rumour I once heard a few
years ago.
Has anybody heard of this too?
That's one of the more outrageous rumours I've ever heard. :-)
The amount of energy required to do that trick would blow every fuse in
your house, and then some. We're talking about living mass here. Physics,
you know... ;-)
However, vibration can cause a head crash...
Johnny
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt(a)update.uu.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol