7 Dec
2018
7 Dec
'18
10:24 a.m.
From>: Christian Corti
I thought that the DEC packs would be similar but no,
DEC had to invent
something different...
Huh? I thought RL0x drives use an IBM 5440 type pack (as used on the IBM
System/3 - I used one of those at my first computer job, they'd just gotten
it in); DEC may have used their own format (and servo track stuff), I don't
know much about the 5440.
Noel
7 Dec
7 Dec
11:11 a.m.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Noel
Chiappa via cctalk
Sent: Friday, December 07, 2018 10:24 AM
To: cctalk at classiccmp.org
Cc: jnc at mercury.lcs.mit.edu
Subject: Re: Opening RL02 disk pack
From>: Christian Corti
I thought that the DEC packs would be similar but no,
DEC had to
invent
something different...
Huh? I thought RL0x drives use an IBM 5440 type pack (as used on the IBM
System/3 - I used one of those at my first computer job, they'd just gotten
it in); DEC may have used their own format (and servo track stuff), I don't
know much about the 5440.
Noel
----
Quoted from "DISK DRIVE CONTROL: THE EARLY YEARS" (Abramovitch & Franklin)
https://www.researchgate.net/publication/3206778_A_brief_history_of_disk_dri
ve_control
"DEC came out with the 125 TPI RL01 disk drive in 1978,which was the first
mass
produced full sectored (embedded) servo drive on the market."
Sounds to me like it was different, but in a good way?
paul
11:18 a.m.
On Dec 7, 2018, at 11:11 AM, Paul Birkel via cctalk
<cctalk at classiccmp.org> wrote:
Quoted from "DISK DRIVE CONTROL: THE EARLY YEARS" (Abramovitch & Franklin)
https://www.researchgate.net/publication/3206778_A_brief_history_of_disk_dri
ve_control
"DEC came out with the 125 TPI RL01 disk drive in 1978,which was the first
mass
produced full sectored (embedded) servo drive on the market."
Sounds to me like it was different, but in a good way?
paul
A good way, definitely. Embedded servo enables the vastly higher densities we have today,
and also enables the use of all surfaces. A dedicated servo surface is not a major hit on
an RP06 that has 10 platters, but on a one or two platter pack it's way too much
overhead.
paul
9 Dec
9 Dec
4:13 a.m.
On Fri, 7 Dec 2018, Noel Chiappa wrote:
Yes, I mean the mechanism of the handle that is different, not the entire
pack.
Christian
From>:
Christian Corti
I thought that the DEC packs would be similar but
no, DEC had to invent
something different...
Huh? I thought RL0x drives use an IBM 5440 type pack (as used on the IBM
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days inactive
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3 comments
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