From: paul.winalski@gmail.com (Paul Winalski)
Subject: [TUHS] 3330s, 3340s, Winchesters... (was: /dev/drum)
Date: Wed, 25 Apr 2018 16:54:16 -0400 [thread overview]
Message-ID: <CABH=_VS2C73=9eCDeC7eihfSSuz68E-eWLFzG0T3tZAo2SzLHQ@mail.gmail.com> (raw)
In-Reply-To: <20180425005251.GL31055@eureka.lemis.com>
On 4/24/18, Greg 'groggy' Lehey <grog at lemis.com> wrote:
>
> Hmm. The earliest 3330s had 100 MB per disk, considerably more than
> the 3340. I had thought that the 3340 had fewer surfaces. And the
> 3330s definitely only had one disk per unit, though they brought out
> an 8-drive cabinet with a whopping 2.4 GB (by the time I used them).
The 3340 indeed had fewer platters per unit than the 3330, and because
of that a lower disk capacity. Both the 3330 and 3340 were CKD
format, not fixed-block, so the capacity depended on the record size.
Highest storage capacity was achieved with one record with a
zero-length key field covering the full track (called full-track
blocking).
According to the IBM Archives web page
(https://www-03.ibm.com/ibm/history/exhibits/storage/storage_3330.html),
the 3330 was code-named Merlin. It could have from 2 to 16 spindles
per controller. Originally each disk pack had a maximum capacity of
100 MB. The 3330 model 11 used IBM 3336 disk packs that had double
the original capacity (up to 200 MB).
This IBM Archives web page
(https://www-03.ibm.com/ibm/history/exhibits/storage/storage_3340.html)
says that the 3340 was code-named Winchester. This page reports, but
does not verify, the "30-30" Winchester rifle story. The IBM 3348
Data Module, the disk pack equivalent for the 3340, was a sealed
module that contained the head assembly. This reduced the hazards of
head misalignment and surface contamination. Unlike later
sealed-module disks, the 3348s were removable media. Modules with
maximum capacities of 35 MB or 70 MB were available. There was also a
70 MB module with up to 0.5 MB accessible from fixed heads.
-Paul W.
next prev parent reply other threads:[~2018-04-25 20:54 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-20 15:02 [TUHS] /dev/drum Tim Bradshaw
2018-04-20 15:58 ` Clem Cole
2018-04-20 16:00 ` David Collantes
2018-04-20 16:12 ` Dan Cross
2018-04-20 16:21 ` Clem Cole
2018-04-20 16:33 ` Warner Losh
2018-04-20 19:17 ` Ron Natalie
2018-04-20 20:23 ` Clem Cole
2018-04-20 22:10 ` Dave Horsfall
2018-04-22 17:01 ` Lars Brinkhoff
2018-04-22 17:37 ` Clem Cole
2018-04-22 19:14 ` Bakul Shah
2018-04-22 20:58 ` Mutiny
2018-04-22 22:37 ` Clem cole
2018-04-22 21:51 ` Dave Horsfall
2018-04-25 1:27 ` Dan Stromberg
2018-04-25 12:18 ` Ronald Natalie
2018-04-25 13:39 ` Tim Bradshaw
2018-04-25 14:02 ` arnold
2018-04-25 14:59 ` tfb
2018-04-25 14:33 ` Ian Zimmerman
2018-04-25 14:46 ` Larry McVoy
2018-04-25 15:03 ` ron minnich
2018-04-25 20:29 ` Paul Winalski
2018-04-25 20:45 ` Larry McVoy
2018-04-25 21:14 ` Lawrence Stewart
2018-04-25 21:30 ` ron minnich
2018-04-25 23:01 ` Bakul Shah
2018-04-23 16:42 ` Tim Bradshaw
2018-04-23 17:30 ` Ron Natalie
2018-04-23 17:51 ` Clem Cole
2018-04-23 18:30 ` Ron Natalie
2018-04-25 14:02 ` Tom Ivar Helbekkmo
2018-04-25 14:38 ` Clem Cole
2018-04-23 20:47 ` Grant Taylor
2018-04-23 21:06 ` Clem Cole
2018-04-23 21:14 ` Dan Mick
2018-04-23 21:27 ` Clem Cole
2018-04-24 3:28 ` [TUHS] 3330s, 3340s, Winchesters... (was: /dev/drum) Greg 'groggy' Lehey
2018-04-24 11:43 ` Paul Winalski
2018-04-24 13:13 ` Clem Cole
2018-04-25 0:52 ` Greg 'groggy' Lehey
2018-04-25 20:54 ` Paul Winalski [this message]
2018-04-23 22:07 ` [TUHS] /dev/drum Tim Bradshaw
2018-04-23 22:15 ` Warner Losh
2018-04-23 23:30 ` Grant Taylor
2018-04-24 9:37 ` Michael Kjörling
2018-04-24 9:57 ` Dave Horsfall
2018-04-24 13:01 ` Nemo
2018-04-24 13:03 ` Arthur Krewat
2018-04-25 1:31 ` [TUHS] Disk data layout (was: /dev/drum) Greg 'groggy' Lehey
2018-04-25 6:43 ` Hellwig Geisse
2018-04-25 21:17 ` Paul Winalski
2018-04-25 21:55 ` Bakul Shah
2018-04-27 15:47 ` Dave Horsfall
2018-04-27 18:16 ` Paul Winalski
2018-04-27 18:37 ` Clem Cole
2018-04-23 23:45 ` [TUHS] /dev/drum Arthur Krewat
2018-04-24 8:05 ` tfb
2018-04-24 12:06 [TUHS] 3330s, 3340s, Winchesters... (was: /dev/drum) Noel Chiappa
2018-04-25 0:47 ` Greg 'groggy' Lehey
2018-04-25 14:15 ` Steffen Nurpmeso
2018-04-27 5:15 ` Dave Horsfall
2018-04-27 13:13 ` Steffen Nurpmeso
2018-04-27 14:42 ` Ian Zimmerman
2018-04-28 8:05 ` Wesley Parish
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