I know of solid state devices that look like a disk; I know of none that looked like a drum. In particular, the 4305 looked like a disk.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of William Donzelli <[email protected]> Sent: Wednesday, December 20, 2017 1:16 PM To: [email protected] Subject: Re: Can anyone remember "drum" storage? While not an actual rotating chunk of metal ("the drum"), there were solid state units that certainly looked like one. The way to get high density solid state memory back in the very early 1970s was to use MOS shift registers (1024 bits on one chip!) that constantly circulated the data. No random access, so if you wanted some data, you would have to wait for it to leave the shift register, then grab it before it went back in - just like the heads on a drum. -- Will, who wants a 2305 On Wed, Dec 20, 2017 at 1:01 PM, Seymour J Metz <[email protected]> wrote: > If it was solid state then it wasn't a drum. > > > -- > Shmuel (Seymour J.) Metz > http://mason.gmu.edu/~smetz3 > > ________________________________________ > From: IBM Mainframe Discussion List <[email protected]> on behalf of > Carmen Vitullo <[email protected]> > Sent: Wednesday, December 20, 2017 9:44 AM > To: [email protected] > Subject: Re: Can anyone remember "drum" storage? > > I remember DRUM storage, just never worked with it, the only other DRUM > storage I saw was at a tour at a data center somewhere in Jersey, my BIL > worked there, did some work with NYSE I believe, and they were mostly all > Univac or PDP systems and I saw what I think was a solid state drum storage > unit, at 19 or 20 I was quite impressed. > > > > Carmen Vitullo > > ----- Original Message ----- > > From: "John McKown" <[email protected]> > To: [email protected] > Sent: Wednesday, December 20, 2017 7:08:40 AM > Subject: Can anyone remember "drum" storage? > > It's not really a drum, but it is getting closer. Of course, for true > speed, one should go SSD. > > http://secure-web.cisco.com/1WIa5MC7UoRkrnpOHeWb4n4X83dgcimZNVNhIQFT9P2CkvK-1Bu7XtNBFQp8I6qpIBGRP3573Dp-9Bmi9nPgBcVNduiYbtyxLlqPxT4IoepODw6STFMW6HVhAv0S64HEB8MTxekSo1FF_c18lPK6nSFC7yTqkxqxc8jRErHP_lk4M_R0cfc1lATHHpRWlLtM2ze6ku6JscBmEShPC1A7cj-J-4a_URFT2pw10_xJMzjW4V4M8wXx15_A0sm38x9CLTUYU17PPYkupGSJsG6XSBFhdtNz7Zgd9FMEak3BujEY3Vh7uD5yrhVvxEDNsTtjtG2W2Gah6WQqpPrF0L8VUrMwhXl1bq9gn3ye4EP9aaZRNIX22DbMpol1KEXueUFKUbJAIyu_jjRhzaznGqBHK95PPabnbjt6Ci030smF-j1szzrVj4Sib1guri4dbSiiS/http%3A%2F%2Fwww.theregister.co.uk%2F2017%2F12%2F19%2Fseagate_disk_drive_multi_actuator%2F > > [quote] > > Seagate is increasing IO performance in disk drives by separating > read-write heads into two separate sets which can operate independently and > in parallel. > > The heads are positioned at one end of actuator arms which rotate around a > post at their other end to move the heads across the platter surfaces. > Thus, with an eight-platter drive, each read-write head is positioned above > the same cylindrical track on each platter and reads or writes to and from > the same disk blocks on each platter's surface. > > [\quote] > > > -- > I have a theory that it's impossible to prove anything, but I can't prove > it. > > Maranatha! <>< > John McKown > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
