[Novalug] need dd help

Andrew Beals andrew.beals@gmail.com
Tue Feb 14 17:36:58 EST 2012


On Mon, Feb 13, 2012 at 7:04 PM, Mark Smith <mark@winksmith.com> wrote:

> On Mon, Feb 13, 2012 at 06:33:21PM -0500, Nino R. Pereira wrote:
> > The disks themselves make great mirrors,
>
> I have an old one lying around somewhere that came from an old DEC
> washing machine sized disk drive (RP04?).  The platter is about 18" wide.
> All the platter together formed a whole 512MB iirc.  Hard to imagine so
> much hardware to read/write that little data.  IIRC, the DEC proprietary
> bus they used had a whole block worth of wires in a bundle the size of
> my wrist, but I'm really taxing my memory for 80's information.
>
> I seem to recall it looking similar to this:
>
> http://en.wikipedia.org/wiki/Disk_pack
>
> Only bigger and about 5 times as tall, but perhaps I was smaller then
> so it's just an optical illusion.
>
> Apologies for the side trip down memory lane.
>
>
You're probably thinking of the RP06 or maybe the RP04.

http://www.columbia.edu/cu/computinghistory/rp06.html

A whole 178MB!

http://www.columbia.edu/cu/computinghistory/rp04.html

92MB!

Man, we never filled whichever one of those we had two of at Maryland.


More pictures here:

http://www.inwap.com/pdp10/hardware/disks-1981.html
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