/usr/home vs /home
jerrymc at msu.edu
Tue Feb 21 15:57:32 UTC 2012
On Tue, Feb 21, 2012 at 06:39:00AM -0600, Robert Bonomi wrote:
> > >
> > > AHA. probably an 'RL-05', cousin to the better known "RK-05"
> I had a memory fault -- the RLs were the RL-01 and RL-02.
> > >
> > > 14" media, in a 'cartridge'. I -think- it was an 'SMD' interface
> > 14" could be true as it just fitted into a 19" rack.
> Virtually all 'removable platter' or 'removable pack' storage of the day
> was 14" media. :)
> There were some "high-capacity" _non-removable-media_ drives that used
> much larger media. A friend had a coffee table made from a 45" disk
Control Data Corp made the drives with the large platters - 45" sounds
about right. It was the 808 Disk drive. It was built on a huge heavy
cast aluminum frame (to counteract vibration)and the heads were 'loaded'
and positioned hydraulicly. There was a large and noisy pump unit right
next to it. It was quite fast at read/write. Here one was set up to
only use a couple of cylinders to reduce seek time and then used as a
CDC was actually a major disk manufacturer in their day.
I also used that DEC setup with the removable disk cartridges
on a PDP-11 an later on a 8650. The 8650 had lots of other
disk, but a cartridge was still used for the system controller
that did things like controlling the boot, etc.
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