DDC Fixed Head Disks

[Gordon JC Pearce]

On Wed, 2007-11-14 at 23:49 -0800, Chuck Guzis wrote:

> Let's see--33,000 RPM is 550 rev/second or about one rev every 1.8 
> milliseconds.  To get that down to 60 microseconds max (2*30) you'd 
> have to pack 36 heads per track.  That's a lot of heads on a 12" 
> disk!

Even assuming only a 3" band of the disk was available (radius being 6",
a bit around the edge and a bit for the spindle), that's still only 12
tracks per inch.  No-one said the heads all had to be in a line, either.
You could mount four head bars with three heads apiece.

Gordon