[TriLUG] Recording Eric Raymond's Talk(s)

[Brian Daniels]

On Fri, Feb 07, 2003 at 04:50:39PM -0500, Tanner Lovelace wrote:
> 
> Hmm... according to the web page (and web pages are never wrong, eh? ;-)
> "In both modes the head drum spins at 9000 rpm and has to be able to
> accurately position each head over it's respective track on a moving
> tape."
> 
> BTW, here's a mirror of that page:
> http://www.trilug.org/~jeremy/minidv_sp_vs_lp.htm
> 

Right.  The tape is moving horizontally.  The drum is mounted at an angle 
across the tape path.  This is hard to express in ASCII.

Aha!  See here: http://www.bealecorner.com/trv900/docs/c-mech-22a.jpg

You can see the angle-mounted drum behind the tape.  The heads (4 or more) 
are mounted in the drum which spins at a constant RPM.  The speed of tape 
motion past the drum determines how wide a track of data is laid down and 
how tightly the tracks are spaced.

--Brian


-- 
Question with boldness even the existence of a god;
because if there be one he must approve of the
homage of reason more than that of blindfolded fear.

--Thomas Jefferson, Aug. 10, 1787


Brian Daniels                  bitmage at bellsouth.net
      http://www.eviloverlord.net