The thing that puzzles me about this point is
why no-one has come onto the market with
a drive that holds multiple sets of heads,
say every 90 degrees (pi/2 radians) around
the disc. Expensive, no doubt, but cuts
the rotational latency by a factor which would
probably get close to 4 (given the right s/w
and a mechanism for synching the position
of the disc.
--
Jonathan Lewis
http://www.jlcomp.demon.co.uk
Author of:
Practical Oracle 8i: Building Efficient Databases
Next Seminar - Australia - July/August
http://www.jlcomp.demon.co.uk/seminar.html
Host to The Co-Operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html
Nuno Souto wrote in message
<3cca102d$0$15475$afc38c87_at_news.optusnet.com.au>...
>and I'd add a third one. It wasn't very relevant many years ago, but it
>is today, in this day and age of sub-nanosecond CPU cycle speeds. And
>that is the rotational speed. It hasn't increased even by an order of
>magnitude in the last 20 years, while processing speed has by quite a
>few. I'm talking linear rotational speed, not angular speed.
>
Received on Sat Apr 27 2002 - 02:09:52 CDT
