OT Identify this disk Pack?

[CRNG]

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
--
Web based forums are like subscribing to 10 different newspapers
and having to visit 10 different news stands to pickup each one.
Email list-server groups and USENET are like having all of those
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--
Web based forums are like subscribing to 10 different newspapers
and having to visit 10 different news stands to pickup each one.
Email list-server groups and USENET are like having all of those
newspapers delivered to your door every morning.

[Herbert Kleebauer]

Post by CRNG
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
https://pix.sfly.com/BTopxs

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

[JJ]

Post by CRNG
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
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]

Post by JJ
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.