OT Identify this disk Pack?

CRNG

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Aug 10, 2016, 8:15:40 AM8/10/16

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OT Identify this disk Pack?

I am posting this question to several NGs where expert "old timers"
familiar with computing in the late 1970s are likely to be found. I
hope someone can help identify the disk pack shown in these two
photos:

https://pix.sfly.com/BTopxs

The pack was used with a DEC PDP-11 from around 1976 to 1982 when the
PDP-11 was decommissioned. I saved the pack as a souvenir, but now I
can't remember what it's storage capacity was :-(

The pack is 15" in diameter and about 1.5" thick in the center and
about 1" thick at the circumference. It has a steel platter in it
about 1/8" thick covered on both sides with brown magnetic coating.
The label on it says: Front Loading Cartridge Precision Methods Inc.

Does anyone recall these and have an idea what their storage capacity
was?

Thanks
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Herbert Kleebauer

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Aug 10, 2016, 11:26:39 AM8/10/16

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On 10.08.2016 14:15, CRNG wrote:
> OT Identify this disk Pack?
>
> I am posting this question to several NGs where expert "old timers"
> familiar with computing in the late 1970s are likely to be found. I
> hope someone can help identify the disk pack shown in these two
> photos:
>
> https://pix.sfly.com/BTopxs

http://www.pdp8.net/rk05/pics/pack.shtml?med
https://en.wikipedia.org/wiki/RK05

JJ

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Aug 10, 2016, 12:33:13 PM8/10/16

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On Wed, 10 Aug 2016 07:15:33 -0500, CRNG wrote:
> OT Identify this disk Pack?
>
> I am posting this question to several NGs where expert "old timers"
> familiar with computing in the late 1970s are likely to be found. I
> hope someone can help identify the disk pack shown in these two
> photos:
>
> https://pix.sfly.com/BTopxs
>
> The pack was used with a DEC PDP-11 from around 1976 to 1982 when the
> PDP-11 was decommissioned. I saved the pack as a souvenir, but now I
> can't remember what it's storage capacity was :-(
>
> The pack is 15" in diameter and about 1.5" thick in the center and
> about 1" thick at the circumference. It has a steel platter in it
> about 1/8" thick covered on both sides with brown magnetic coating.
> The label on it says: Front Loading Cartridge Precision Methods Inc.
>
> Does anyone recall these and have an idea what their storage capacity
> was?
>
> Thanks

Just searched them with Bing Image search and found it on below page (6th
row). It states that it's "approximately 28MB", but it isn't clear whether
the unit is MB or MiB.

<http://q7.neurotica.com/Oldtech/Media/RigidDisk.html>

CRNG

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Aug 10, 2016, 3:34:15 PM8/10/16

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On Wed, 10 Aug 2016 23:33:11 +0700, JJ <jj4p...@vfemail.net> wrote
in <nj9bojmp3q7p.16wxrc52zxhgr$.d...@40tude.net>

>Just searched them with Bing Image search and found it on below page (6th
>row). It states that it's "approximately 28MB", but it isn't clear whether
>the unit is MB or MiB.
>
><http://q7.neurotica.com/Oldtech/Media/RigidDisk.html>

Thanks JJ (and Herbert). From the above link it looks like a 2.5Mb
RK05 to me.