16 Aug
2022
16 Aug
'22
9:51 p.m.
> I think it was Dysan that first showed up with
reinforcing ring kits to
> be applied to disks to ameliorate the problem, but ultimately the
> solution turned out to be making sure that the motor was on during the
> seating process. That's why, for example, 5.25" DD media usually has
> hub reinforcement, but HD media rarely does. By the time HD media was
> a thing, the problem had been solved.
On Tue, 16 Aug 2022, Ali via cctalk wrote:
Then why was is it that DD media bought well after HD
media was available, in use, and the norm still had the reinforced ring? Tradition?
1) because they need to keep reinforcing until the very last SA400 is
buried.
2) It became the recognizable indicator for which disks were which,
especially for those who wouldn't read the label.
With a hib-ring is prob'ly a low density;
without a hub-ring was either early low density, or "HD".
3) They still had inventory of hub-rings to use up.
Dysan disks were always good.
The early Verbatim disks were not. It was a long time before anybody
else, such as Wabash, made anything as bad.
To get over their own reputation, Verbatim redesigned, and came out with
the "Datalife" series of disks, which were good. And had hub-rings.
Inmac used to sell hub-rings and jig to apply them.
The "plus" version of the "Berkeley Microcomputer Flip-Jig" also had a
post and ring for aligning hub-rings.
When we ordered diskettes for the TRS80s in the college lab, the district
purchasing agent, who was in bed with Royal, sent us "Roytype" HD disks.
When formatted on the TRS80, they would self-erase in minutes!
They kept sending us Roytype HD, Even when we specified that we wanted
"Verbatim Datalife".
But, when we insisted that we needed hub-rings on them, we finally got DD
disks.
--
Grumpy Ol' Fred cisin(a)xenosoft.com