🚀 go-pugleaf

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
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