[Default] On 20 Dec 2017 05:07:26 -0800, in bit.listserv.ibm-main [email protected] (John McKown) wrote:
>It's not really a drum, but it is getting closer. Of course, for true >speed, one should go SSD. I remember the IBM 650 which had a 2000 (I think upgradaable to 4000) 10 digit word drum that served as main memory. The instructions were do something with memory and/or an accumulator and jump to the next instruction. Clark Morris > >http://www.theregister.co.uk/2017/12/19/seagate_disk_drive_multi_actuator/ > >[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] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
