16 Aug
2022
16 Aug
'22
4:20 p.m.
On 8/16/22 08:17, Jonathan Chapman via cctalk wrote:
Ah, I've always gone by the physical drive itself. There were changes
early on with the blue-lever Micropolis drives to start the motor when
closing the drive latch. It was a real problem back in thee day with
the early drives--the spindle motor wouldn't be turning when the disk
was seated, which resulted in seating the disk off-center much of the
time, mangling the hub.
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.
--Chuck
The last time
I checked, bitsavers had information on the 1015, 1016 and
1115 floppy drives (I have all three models). Did the VG use something
different?
No, but I didn't find the model numbering w.r.t. first chassis vs. expansion chassis
very clear, especially between the older "blue box" drives and newer "beige
box" drives, and the new Micropolis site lays it out plainly with a table of possible
model numbers. The new site was one of the higher results for one of the expansion chassis
model numbers I'd searched.