9 Feb
2015
9 Feb
'15
2:10 a.m.
Would anyone know if it's still possible to just replace the platters and
clean the heads?
If the heads are really crashed, the only safe course is
to replace both the damaged heads and the damaged disk pack.
Anything else admits a substantial risk of carrying the
crash forward.
Cleaning the heads probably isn't an option; when they
crash, they don't just pick up material from the disk
platter, they may themselves be damaged enough that sharp
bits of the heads themselves are sticking out.
Norman Wilson
Toronto ON
12 Feb
12 Feb
9:29 p.m.
New subject: mkfs somewhere else?
On Sun, 8 Feb 2015, Norman Wilson wrote:
Cleaning the heads probably isn't an option; when
they crash, they don't
just pick up material from the disk platter, they may themselves be
damaged enough that sharp bits of the heads themselves are sticking out.
Not just that, but the aerodynamics have been screwed up. The heads will
no longer "float" on an air-cushion; I believe the gap is the traditional
human hair width, if that.
Trivia: there is a small NiCd battery in the RK-05 drive which has to be
replaced every so often; its sole job is to drag those heads back in the
event of a power failure, whether it was writing at the time or not.
--
Dave Horsfall DTM (VK2KFU) "Bliss is a MacBook with a FreeBSD server."
http://www.horsfall.org/spam.html (and check the home page whilst you're there)
9:50 p.m.
New subject: mkfs somewhere else?
Dave Horsfall:
Not just that, but the aerodynamics have been screwed
up. The heads will
no longer "float" on an air-cushion; I believe the gap is the traditional
human hair width, if that.
Much larger. I remember seeing a scale drawing that showed the gap
as half an inch or so, with a dust particle the size of a freaking
mountain and a human hair that looked like a Tipler cylinder.
--
John Cowan http://www.ccil.org/~cowan cowan(a)ccil.org
If I have not seen as far as others, it is because giants were standing
on my shoulders. --Hal Abelson
13 Feb
13 Feb
1:18 a.m.
New subject: mkfs somewhere else?
On Thu, Feb 12, 2015, at 10:50, cowan(a)ccil.org wrote:
Dave Horsfall:
I think that's based on a modern hard drive, though. There's a reason
modern hard drives are sealed with air filters on the pressure
equalizing ports.
Not just that, but the aerodynamics have been
screwed up. The heads will
no longer "float" on an air-cushion; I believe the gap is the traditional
human hair width, if that.
Much larger. I remember seeing a scale drawing that showed the gap
as half an inch or so, with a dust particle the size of a freaking
mountain and a human hair that looked like a Tipler cylinder.
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cowan＠ccil.org -
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random832＠fastmail.us