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_at_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_at_jdedwards.com>
>> To: 'cctalk_at_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_at_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:
>>
>> > 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
>the
>> > 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
>
Received on Thu Oct 10 2002 - 15:17:00 BST