Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!rutgers!lll-lcc!styx!kehres From: kehres@styx.UUCP (Tim Kehres) Newsgroups: comp.periphs Subject: Re: CDC 3-year warranty believable? Message-ID: <21060@styx.UUCP> Date: Sun, 7-Dec-86 20:16:23 EST Article-I.D.: styx.21060 Posted: Sun Dec 7 20:16:23 1986 Date-Received: Sat, 20-Dec-86 02:09:29 EST References: <4647@mimsy.UUCP> <1306@cit-vax.Caltech.Edu> Reply-To: kehres@styx.UUCP (Tim kehres) Organization: Lawrence Livermore Laboratory, Livermore CA Lines: 44 In article <1306@cit-vax.Caltech.Edu> mangler@cit-vax.Caltech.Edu (System Mangler) writes: >I read in one of the DEC-watcher rags that CDC just introduced an >even bigger drive, 1.3 gigabytes. No Emulex controller yet, so I >assume that means that the transfer rate went up. (Why can't the >controller makers keep up with the drives?!?). Is it worth a look? > >Don Speck speck@vlsi.caltech.edu {seismo,rutgers,ames}!cit-vax!speck To start with, I have absoloutely no connection with the folks that work with the disk drives, but I picked up some stuff at the latest Comdex that may be of interest. The drive that I believe you are referring to has the following specs (from the CDC sales literature): MODEL: XMD III SPECIFICATIONS ============== Drive Capacity (Mbytes) 1359 Disks 6 Disk surfaces 9.5 Tracks/surface 1420 Track density (TPI) 1280 Recording density 15,400 Rotation speed (r/min) 3600 Average latency (ms) 8.38 Seek time Single track (ms) 5 Average (ms) 16 Maximum (ms) 30 Interface SMD-E, IPI-2 Transfer rate (MHz) 24 (3 Mbytes/s) Data code NRZ MTBF (Hours) 30,000 Service life (Years) 5 The transfer rate quoted may be higher than some controllers are capable of, but this rate is by no means unique. The Century C2800 and Hitachi DK815-10 for example are also quoting similar transfer rates. Tim Kehres Control Data Corporaton / Lawrence Livermore National Laboratory ---------------------------------------------------------------- UUCP: {lll-crg,ihnp4!lll-lcc}!styx!kehres ARPA: kehres@lll-tis-b.ARPA AT&T: (415) 463-6852