PDP-11/34 & RK05 Questions

From: David Gesswein <djg_at_drs-esg.com>
Date: Thu Aug 3 13:08:43 2000

> On Thu, 3 Aug 2000, David Gesswein wrote:
> > When I first spin up the pack I run a program which quickly seeks seeks
> > through each track and then repeats.
> >...
>
> Aaron Nabil:
> I'd routinely (on other drives, not specifically an RK05) kill the servo
> and manually move the head actuator across the disk to do the same thing.
>
Watch out on the RK05, the power fail battery seems to still unload the
heads on power fail even if that switch is off. If your finger is in the
way the head positioner will win. Never put your finger/tools where unexpeced
motion can get it (insert all the other obvious warning here). Also if you
flip the switch back on when the heads are loaded the servo can get confused
and go full steam ahead to the end of travel. This didn't seem to harm
anything but did make me jump. A quick snap of the switch may help prevent
this but I didn't try to verify.
Received on Thu Aug 03 2000 - 13:08:43 BST