27 Feb
2015
27 Feb
'15
11:58 a.m.
On 02/27/2015 11:40 AM, Eric Smith wrote:
On Fri, Feb 27, 2015 at 10:05 AM, Chuck Guzis
<cclist at sydex.com> wrote:
I'm not sure that the "fine" stepper was used other than to bring the
head initially on-track. That is, I'm not at all sure that it
compensated for any eccentricity.
--Chuck
On 5.25" Drivetec floppies, the cylinder
density is
double that--192 tpi.
Now consider the hub-clamp mechanism of a 5.25" drive. I suspect that with
a bit of care, one can probably get things right most of the time.
And the only way Drivetec was able to get that to work was by using an
embedded servo for closed-loop positioning.