Gilles,
The 7935 had the user-removable pack. The 7933 pack was removable as well, but the top shroud of the 7933 had to be removed first to gain access to the door-lock mechanism.
The heads of these drives had clear plastic tubes (like an air hose in an aquarium) that enclosed and protected the tiny head wires. The plastic tube would get hard/brittle over time and would eventually break. As the head mechanism went back and forth across the platters, the plastic tube was constantly getting flexed. Once the plastic tubing broke, it would start to wear away at the tiny head wires, eventually breaking them, and causing disk read/write errors. For a while, there was a shortage of replacement disk heads. HP couldn't keep up with the demand for them. I replaced hundreds of these disk heads in Texas, Louisiana, and North Carolina. This problem was found in the 792X drives as well.
Regards,
Steve Gray
Abtech Support
-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf Of Gilles Schipper
Sent: Thursday, March 06, 2008 12:36 PM
To: [log in to unmask]
Subject: Re: [HP3000-L] HP7933 - Was: newbie question -storing a file from tape to disk -
If my memory serves me correctly, some time after the 7933 was announced and became quite popular, HP had a massive "recall" in order to change faulty heads that were causing disk crashes.
This required CE's to replace the heads on any affected 7933 at the next opportunuity - usually the next preventative maintenance call.
Now here is where my memory may be a bit fuzzier, but I seem to recall that around that time, HP announced the 7935, which was exactly the same as the 7933, but was modified to permit the user to replace the disk pack itself.
(Perhaps the 7935 was the original and the 7933 was the one with user-replaceble disk packs.)
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Gilles Schipper
GSA Inc.
HP System Administration Specialists
300 John Street, Box 87651 Thornhill, ON Canada L3T 7R4
Voice: 905.889.3000 Fax: 905.889.3001
email: [log in to unmask] web: http://www.gsainc.com
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---------- Original Message -----------
From: "Bob J." <[log in to unmask]>
To: [log in to unmask]
Sent: Thu, 6 Mar 2008 13:20:14 -0500
Subject: Re: [HP3000-L] HP7933 - Was: newbie question -storing a file from tape to disk -
> As we travel down memory lane............
> CEs were supplied a hoist to attempt installing & servicing the upper
> 7933 drives.
> That setup never seemed safe for anybody within 20 feet of the racked
> drives.
> Sleuth was fun for the Series II/III. SleuthSM (simulator) was nice
> for the HP-IB systems. Those utilities that did the actuator
> "butterfly" test would usually pass through the resonant frequency of
> the drive to make some scary noises.
>
> Bob J. -- Ideal Computer Services
> http://www.icsgroup.net
>
> Jeff Kell wrote:
>
> >>>
> >>
> >>
> >> Does anyone recall the "rack-mounts" for stacking 7933s? Anyone
> >> else ever "race" 7933s across the DP centre floor by judicious use
> >> of adager or fcopy?
> >
> >
> > 'Sleuth' on a 7920/7925 could produce some very humorous results.
> > Don't recall that utility making it beyond the Series II/IIIs though.
> >
> > Jeff
> >
> > * To join/leave the list, search archives, change list settings, *
> > * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *
> >
> >
>
> * To join/leave the list, search archives, change list settings, *
> * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *
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