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From: dmc@videovax.Tek.COM (Donald M. Craig)
Newsgroups: comp.periphs
Subject: Re: Why optical disks are slow to seek;
Message-ID: <4041@videovax.Tek.COM>
Date: Tue, 18-Nov-86 17:22:05 EST
Article-I.D.: videovax.4041
Posted: Tue Nov 18 17:22:05 1986
Date-Received: Wed, 19-Nov-86 22:03:00 EST
References: <1128@tekig5.UUCP> <5100141@ccvaxa> <amdcad.13214>
Reply-To: dmc@videovax.UUCP (Donald M. Craig)
Organization: Tektronix Television Systems, Beaverton, Oregon
Lines: 35

Fresh from Comdex, here are the specifications on the new
(no prices yet) 6.8 GByte Kodak double sided write once
14" optical disc drive.   It is organized in five constant speed
bands, meaning you have to change the angular velocity of the disc
when you switch from band to band.   There is also a concept
called a 'window', which essentially refers to the ability of
the tracking mechanism to select one track out of some.

Drive:
	Capacity	Per Window	Per Band
	  Band 0	2.1 MByte	1.24 GByte
	  Band 1	1.7 MByte	.86 GByte
	  Band 2	1.4 MByte	.61 GByte
	  Band 3	1.2 MByte	.41 GByte
	  Band 4	1 MByte		.28 GByte

	Capacity per side: 3.4 GByte
	Capacity per sector: 1024 Bytes

	Access Time within window: 3 ms.
	Access Time within band average: 100 ms.
	Access Time between bands average: 400 ms.

	Recording Density: 21,000 bpi
	Track Density: 14,111 tpi

	24" high, 17.7" wide, 24" deep, 200 lbs. very heavy
	90 to 127 VAC, 6.0 Amps. average, 15.0 Amps. max.

Controller:
	SCSI, IPI 3 interface, 1.0 MByte per second transfer rate
	Burst transfer rate of 10 Mbyte per second
	128 KByte buffer in controller

	7" high, 17.7" wide, 24.0" deep, 60 lbs. heavy.
	90 to 127 VAC, 6.0 Amps. max.