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Date: Tue, 9 Sep 1997 09:57:01 +0930
From: Greg Lehey <grog@lemis.com>
To: Simon Shapiro <Shimon@i-Connect.Net>
Cc: Mike Smith <mike@smith.net.au>, chat@FreeBSD.ORG, hcremean@vt.edu
Subject: Re: lousy disk perf. under cpu load (was IDE vs SCSI)
References: <19970909082656.57842@lemis.com> <XFMail.970908165203.Shimon@i-Connect.Net>
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In-Reply-To: <XFMail.970908165203.Shimon@i-Connect.Net>; from Simon Shapiro on Mon, Sep 08, 1997 at 04:52:03PM -0700
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On Mon, Sep 08, 1997 at 04:52:03PM -0700, Simon Shapiro wrote:
>
> Hi Greg Lehey;  On 08-Sep-97 you wrote:
>>  On Mon, Sep 08, 1997 at 02:37:07PM -0700, Simon Shapiro wrote:
>>>
>>> Hi Greg Lehey;  On 08-Sep-97 you wrote:
>>>>  On Mon, Sep 08, 1997 at 03:46:35PM +1000, Mike Smith wrote:
>>>>>>
>>>>>> PS: When did the first voice-coil-seek hard drives come out? This is
>>>>>> a
>>>>>> question that's been bugging me for some time now...
>>>>>
>>>>> Linear or rotary actuator?
>>>>
>>>>  I'd always equated "voice coil" with linear actuators.  I'd guess the
>>>>  early 70s.  We installed the first UNIVAC 8440s in 1973.  I think
>>>>  they
>>>>  were voice coil.  They looked like 3330 copies.
>>>>
>>>>> The linear VC actuator probably predates the use of stepper motors;
>>>>
>>>>  I'd think so.  The stepper motors wouldn't have got into hard drives
>>>>  until about the ST-506.
>>>
>>> The 26MB Shugart 14" drive had stepper and AC spinfle motor on a long
>>> belt.
>>
>>  When was that introduced?
>>
>>  Greg
>
> I do not remember.  We used it in several Z-80 MP machines we built.
> That was way before 8" drives, before any PC.  The machine was an S-100
> multi-processor.  Maybe the fact that we used the first US shipment of
> 64kbit DRAM on that machine will give you a clue.
> Micropolis was experimenting with 8" drives about a year later.

Sounds like about 1980.

Greg