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
