1 Dec
2012
1 Dec
'12
12:11 p.m.
> Seagate 212 drive, with formed clear plastic top
cover; probably a
> booth demo for a tradeshow 2 heads (one inner, one outer on top of
> single platter
nd another 2 on bottom, I think, for "4 heads 3-g
cylinders" on single
platter.
On Wed, 28 Nov 2012 cctech at vax-11.org wrote:
I remember something about that drive. It used two
heads, one for the
inner radious and one for the outer radius to improve the access time.
except that I don't think that it called it "cylinder 0 - 305
accessed byhead A and cylinder 306 - 611 accessed by head B".
Instead, it had cylinders 0 - 305 of each head.
Continued with other ST2XX drives?
Therefore, "First" drive where even cylinder 0 of one head was
intrinsically less reliable than cylinder 305 of a different head.
Time to re-design the premise of allocation to outer cylinders first!
"first" drives to misrepresent it's physical geometry to the controller?
"first" half height drive?
THIS one had a clear plastic top cover, which was often done
for the drives on display in tradeshows (Comdex, Wescon, etc.)
THIS ONE may have been THE ONE used to INTRODUCE half-height
drives, multiple heads per surface, misrepresentation [TO THE
CONTROLLER] of geometry, etc. (Or it may have been one of
millions used in later years to show "BEFORE" when introducing
more modern drives.)
Now days 10MB would fit on a single track with room to
spare.
or as less than 1/1000the the capacity of fingernail sized MicroSD
"Someday, you'll be able to fit the entire Encyclopedia Britannica
into a bread-box" ("Britannica as unit of measure" for Moore's law,
and new technology hype) :
"Never happen. We're not in the information business;
we're in the leather bookbinding business." - a Britannica engineer
(Mere fact that Britannica employed engineers showed that he was wrong.)
I wonder if one of the museums would be interested in
an artifact like
that.
It's too important an artifact for that! :-)
It got claimed here. (home of the BEST collectors)
--
Grumpy Ol' Fred cisin at xenosoft.com