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From: Sarr Blumson <sarr@sdf.org>
Newsgroups: comp.arch
Subject: Re: Where did CKD disks come from?
Date: Mon, 23 Dec 2024 18:40:27 -0000 (UTC)
Organization: A noiseless patient Spider
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EricP <ThatWouldBeTelling@thevillage.com> wrote:
> John Levine wrote:
> 
> BTW if you want to see a weird piece of storage hardware,
> take a gander at the chapter on 2321 Data Cell Drive.
> It has a rotating drum with cards in slots that move up and down
> to be read, kind of like the old slide projectors,
> and each card has 10 magnetic stripe
> 
> http://www.bitsavers.org/pdf/ibm/2841/
> 
> http://www.bitsavers.org/pdf/ibm/2841/A26-5988-0_2841_2311_2321_7320_Descr.pdf

In 1969 I was a TA for intro programming with ~300 studemts at Michigan. The 
Computer Center had just bought a DataCell and, because they intended it for
archival storage, made it cheap. So we, being budget conscious, put the
course files for out final problem on it. During finals week. MTBF was about
20 minutes. Great unhappiness. 

-- 
sarr@sdf.org
SDF Public Access UNIX System - http://sdf.org