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Yes, it
was a huge stack of platters with the head that had to be withdrawn so that it
could move up/down on a column to get to the correct platters. It then would move
to the proper track. Seek times could be measured in seconds if the arm had to
traverse from top to bottom or vice versa. I just googled
IBM 2305 and found a link to an IBM storage history page - http://www-03.ibm.com/ibm/history/exhibits/storage/storage_photo.html
. From the pictures, the 355, 1301, 1302, and 1405 show their 350 (the model
number of the disk used in the RAMAC 305) heritage. Regards, Richard Schuh -----Original
Message----- Wasn't that
the one with the single read/write head on an arm that would do a seek to the
platter before it started going after the rec. If I remember correctly,
CE's would normally keep a big pan underneath to catch the constant drippings
of hydraulic oil. I remember something like that, altho it may have been
the S/360 reincarnation of the 2nd generation drive, just as the 2311 bore a
striking resemblance to a 1311. This is a multi-part message in MIME
format. -----Original
Message----- From: The IBM
z/VM = Operating=20 System [ mailto:[email protected]]On Behalf Of Schuh,=20
Richard Sent:
Tuesday, April 25, 2006 1:13 PM To:=20
[email protected] Subject: Re: z/VM I/O=20 Concurrency Regards, Richard = Schuh <= SPAN class=3DEmailStyle16> . Again, this is=20 a HARDWARE restriction
that goes back to the dark ages of=20 s/360. Or farther. Anyone = remember the disks
used=20 by the 1410 (the model number escapes me, as do so many things of
late)=20 or the RAMAC 305? Besides, the S/360 introduced "The Age of =
Enlightenment",=20 didn't it? -- John=20
McKown Senior
Systems Programmer HealthMarkets Keeping the =
Promise of=20 Affordable Coverage Administrative
Services Group Information=20 Technology << ella for = "" Control >>
has removed=20 3894 VSE-List messages and set aside 2216 VM-List = for="" me
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