18 Nov
2007
18 Nov
'07
11:52 p.m.
On 18 Nov 2007 at 15:24, Fred Cisin wrote:
A lot of the increased capacity of LS120, ZIP,
Drivetek, and Floptical
came from cramming a LOT of tracks on the disk, requiring various servo
systems, and generally a significant loss of reliability.
It seems like a long time since I've seen a Bernoulli drive.
I've still got a 150MB dual unit--it does weigh quite a bit.
The remarkable thing about the Bernoilli drives to me was the method
of providing a stable air bearing between the head and the flexible
disk by applying a positive air pressure to the surface of the disk.
It brought to mind the illustration used involving a playing card, a
pin and a thread spool. Push the pin though the card and use it to
center the card over one end of the spool. Initially holding the
card close to the spool, blow through the opposite end of the spool
and then release the card. Instead of flying off, the card remains
attracted to the spool as long as one keeps blowing. Bernoilli
drives weren't much different in principle.
Cheers,
Chuck