17 Jul
2018
17 Jul
'18
9:50 a.m.
On Mon, Jul 16, 2018 at 4:58 PM, Fred Cisin <cisin at xenosoft.com> wrote:
On the Lisa "Twiggy" diskettes, they made
special provision to get more
On Mon, 16 Jul 2018, Eric Smith wrote:
The latter, two single single-sided heads, each opposed by a pressure pad.
Aside from the provision for extra fingerprints, a problem with this scheme
was that they varied the rotation rate depending on the position of the
head in use. Unfortunately since there was only a single actuator, when the
top head was near the inside, the bottom was near the outside, and vice
versa. Except for the middle few tracks, it was never fast to switch from
one head to the other without seeking. The logical disk organization was
all of side zero followed by all of side one, rather than by cylinder.
thumb
prints.
I imagine you're aware of the actual reason
for the two diametrically
opposing jacket cutouts for the read/write heads.
I'm NOT sure. I speculate:
2) To have two sets of heads. Either performance, or simply two single
sided heads, to have felt pad instead of head to head pressure