Message-ID: <217@cmu-ri-rover.ARPA>
Date: Thu, 7-Mar-85 16:46:59 EST
Article-I.D.: cmu-ri-r.217
Posted: Thu Mar  7 16:46:59 1985
Date-Received: Sun, 10-Mar-85 07:16:40 EST
Organization: Carnegie-Mellon University, CS/RI
Lines: 42

I received some information from Sony about the CD-ROM's.

Sony CDU-1 CD ROM Drive Unit -

	Performance.

Memory capacity:	540M bytes/disc
Total number of blocks:	270K blocks/disc
Data block size:	2K bytes (2,048 bytes)/block
Data block rate:	75 blocks/sec
Data Transfer Rate:	600K bytes/sec (max)
			150K bytes/sec (sequential)
Average Access Time:	50 msec (block to block) 
			1,500 msec (first to last block)
Bit error rate:		10^-12 (after error correction)

	Physical Specs.

Optical pickup:		Semiconductor Laser (lamda = 7,800 A)
Rotational speed:	Approx. 200-530 rpm
Motor start-up time:	1 sec. (Max)
Usage:			Horizontal only
Indicator:		Activity indicator on the front panel
Operating temperature:	5C to 45C
Power requirements:	+12V, 112V DC, 1A (average) 2A (peak)
			+5V DC, 1A (average)
Dimensions:		Envelope (149W x 82.6H x 208D)mm
Weight:			3 kg.

There is an optional AC power adapter that supplies all the correct voltages.
(AC-800 AC Power Adapter)

Complete with descramble, sync detection, header check and error correction.
No controller needed. Built in exactly the same size as a 5" floppdisk drive
unit.

The data base you have built up can readily be transformed into CD ROM's.
You send 1/2" recorded tapes to Sony and they add all necessary subcodes
and error correction codes as well as sync and header signals.

Apparently these will be $300 in quantity.