I believe you are correct. They had to color-code them. I remember the jockeying for position to get these heads, what a screw-up that was.
Does anyone remember when HP got out of the disk drive business? I think it was around 1995.
Denys...
-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf Of Joseph Dolliver
Sent: Thursday, March 06, 2008 5:14 PM
To: [log in to unmask]
Subject: Re: [HP3000-L] HP7933 - Was: newbie question -storing a file from tape to disk -
Yeah, they were called green heads as I think.
Huge fail rate, kept HP busy for months replacing them all
>From: Gary Robillard <[log in to unmask]>
>Date: 2008/03/06 Thu PM 03:10:42 CST
>To: [log in to unmask]
>Subject: Re: [HP3000-L] HP7933 - Was: newbie question -storing a file from tape to disk -
>Since the 7933/35 topic seems to live on...
>
>The head problem didn't cause disk crashes, but was a problem where the head
>cables would become intermittent and finally would lose their connection,
>causing read/write problems (if you were writing when the cable quit, you
>now had bad data on your disk). That is what prompted the badsectr utility
>which was originally written for MPE/V.
>
>The 7933 was released because they couldn't get the seal right in order to
>prevent contamination from entering the disk pack when it was changed, so
>the door unlock was defeated and it was a 'fixed' pack. Once the seal
>problem was fixed, the 7935 was released with the 'door open' switch
>operable...
>
>Thanks,
>
>Gary Robillard
>
>
>
>-----Original Message-----
>From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf
>Of Gilles Schipper
>Sent: Thursday, March 06, 2008 11:36 AM
>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 diskpack itself.
>
>(Perhaps the 7935 was the original and the 7933 was the one with
>user-replaceble disk packs.)
>
>-----------------------------------------------------------------------
>-
>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
>-----------------------------------------------------------------------
>-
>
>---------- 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 *
>------- End of Original Message -------
>
>
>
>* 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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joseph dolliver
e3k solutions , inc
41630 marie court
leonardtown, md 20650
301-475-6985
* To join/leave the list, search archives, change list settings, *
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