The 3380 (3390 also?) had the same, one pack of disks with 2 independent actuators on each side, representing 2 volumes.
Kees. > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf Of Tony Thigpen > Sent: 20 December, 2017 14:19 > To: [email protected] > Subject: Re: Can anyone remember "drum" storage? > > From reading the description, it really just appears to the OS as two > drives in one housing. > > Tony Thigpen > > John McKown wrote on 12/20/2017 08:08 AM: > > It's not really a drum, but it is getting closer. Of course, for true > > speed, one should go SSD. > > > > > http://www.theregister.co.uk/2017/12/19/seagate_disk_drive_multi_actuato > r/ > > > > [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 ******************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ******************************************************** ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
