2 Apr
2005
2 Apr
'05
4:37 p.m.
At 12:15 AM 4/3/05 +0100, you wrote:
Burroughs disk drives also used a NiCad pack to withdraw the heads. They
used SAFT batteries and they were an absolute POS! We were constantly
replacing disks and disk heads because of them. I'd strongly advise anyone
that has a drive that uses NiCads to replace them before they even turn the
thing on. AND use a GOOD brand of batteries. Saft batteries are S$%T IMO!
I've had good results with the JAPANESE made Sanyos and Panasonic bateries.
The DG drives have the same system, a N.O. relay with a huge cap
yanks the linear motor home, should power fail. ANd there's the
DEC used a little NiCd battery pack, an NC relay contact (in other words,
closed when the relay was de-energised, it was normally energised when
the drive was in operation so that the contact was open then) and a
microswitch that opened when the positioner was fully retracted. At least
on the RK05...
The RK07 had something similar, at least there's a NiCd pack clipped
under the chassis.
Didn't some winchesters use the spindle motor as a generator to provide
the emergency retraction current?
The drives used in PC do that and have for many years but I never saw a
mainframe disk drive that did.
Joe
-tony