10 Oct
2002
10 Oct
'02
11:17 a.m.
Hi
There really isn't much danger if the machine isn't
moved. The heads are really quite smooth and landing
doesn't cause any significant issues. The problem
happens because the back edge of the head is very
sharp. If the surface back rotates, just a tiny amount,
this back edge will dig into the surface.
Some of the early drives had an issue because of motor
cogging. This would cause the disk to back rotate a
little on stopping. The early fix for this was to
put a one way brake on the spindles.
Dwight
From: "Glen Goodwin"
<acme_ent(a)bellsouth.net>
Thanks, Bob. I've been using this system off and on for a couple of years,
and it never occurred to me that I had to park the heads before each
power-down. Apparently there hasn't been any damage as a result, but I'll
start doing it . . .
Glen
0/0
From: Feldman, Robert
<Robert_Feldman(a)jdedwards.com>
To: 'cctalk(a)classiccmp.org'
Subject: RE: Park heads when moving Kaypro 10?
Date: Thursday, October 10, 2002 12:33 PM
I seem to remember that self-parking heads generally were not available
on
the 10MB drives of Kaypro 10 vintage, so I did a
little Googling and came
up
with the following
(http://www.atarimagazines.com/creative/v9n12/8_The_Kaypro_10_more_than_.php
) from CREATIVE COMPUTING VOL. 9, NO. 12 /
DECEMBER 1983:
"A very important command is included in the Kaypro 10 system software.
SAFETY moves the read/write heads on the hard disk to the safe landing
zone
on the disk. This must be done before turning the
power off or the
surface
of the hard disk may be damaged. The SAFETY
command is invoked from the
command mode in CP/M."
Bob
-----Original Message-----
From: Don Maslin [mailto:donm@cts.com]
Sent: Wednesday, October 09, 2002 5:37 PM
To: classiccmp
Subject: Re: Park heads when moving Kaypro 10?
On Wed, 9 Oct 2002, Glen Goodwin wrote:
the
Hi --
Thanks to Don Maslin I'll soon have a set of reload diskettes for my
Kaypro
> 10, and I plan to bring it from home to my shop to do the reload.
>
> Is there a "park" or "ship" command I need to run before
transporting unit, so
as not to damage the hard drive?
IIRC, it is built into the operating system and when the HD LED goes
out, the heads have been parked.
- don
> TIA --
>
> Glen
> 0/0