Disk platter identification

[Paul Koning]

>>>>> "Ethan" == Ethan Dicks <ethan.dicks at gmail.com> writes:

 Ethan> On 7/19/05, Director <csmuseum at cse.uta.edu> wrote:
 >> Here's an URL for the image in question:
 >> 
 >> http://www.cse.uta.edu/TheMuseum@CSE/Whazat.html

 Ethan> At 1/4" thick, there's a chance it's a DF32 platter.  I don't
 Ethan> remember how large the hub hole is, but at first glance, and
 Ethan> with the PDP-8 suggestion, that's what I'd have to guess.

 Ethan> I have never seen an RF08 platter, so I don't know how
 Ethan> physically similar they are.

Is the RF08 like the RF11?

On second thought, that may be more like it.  I forgot the size of the
RF64, but I don't think it was 16 inches diameter.  (I though 8 inches
was diameter not radius...)  For the RF11 that sounds just right.  I
haven't ever seen an RS03 or RS04 platter; that's probably about the
same size as the RF11.

I don't think the RF11 had a ritation sensor.  It had a clock/timing
track which encoded, among other things, the start of track mark.
There was a gap at that point.  When reformatting the timing track (if
you replaced the platter, for example) you'd adjust a knob on the
timing track formatter until its indicator lights showed that the gap
length was within the required range.

       paul