Path: utzoo!mnetor!uunet!husc6!bbn!rochester!udel!gatech!ufcsv!codas!burl!clyde!watmath!watdragon!daford
From: daford@watdragon.waterloo.edu (Daniel Ford)
Newsgroups: comp.ivideodisc
Subject: Re: CD (roms) question
Message-ID: <4513@watdragon.waterloo.edu>
Date: 7 Jan 88 20:04:50 GMT
References: <7813@eddie.MIT.EDU>
Reply-To: daford@watdragon.waterloo.edu (Daniel Ford)
Organization: U. of Waterloo, Ontario
Lines: 38

In article <7813@eddie.MIT.EDU> nathan@eddie.MIT.EDU (Nathan Glasser) writes:
>
>What exactly is the capacity of a standard size CD, both in bytes and
>in playing time for music (assuming a standard speed)? I've been

The capacity of an audio CD is approximatley 60 minutes.  The figure of
75 minutes is part of the Sony-Philips standard but most do not
use this amount.

The capacity in bytes depends on the level of error checking required.

	Excellent (below 10 ** -25) -> 553 Megabytes

	little/none		    -> 682 Megabytes

Basically enough to store more than 200000 pages of text.

>worth of music, whereas others have almost an hour. Some have 9 songs
>and some have 25 songs.  Is there a limit to the number of "tracks"
>that they can have? 

An audio CD can have a maximum of 99 tracks.

There is basically no physical difference between an audio CD and a 
CD ROM.  They even have logical similarities in addressing sectors.  The
main difference is that the data on an audio CD is always digitized sound
and on a CD ROM it may not be.  The discs are single sided and made from
polycarbonate (the same stuff as in bullet proof windows).  The two
types of disks can be read with the same drive (Hitachi makes one right now)
"all" that is needed is a D/A convereter.

					Dan Ford

-- 
---------------------------------------------------------------------
Daniel A. Ford 					daford@watdragon.uucp
CS Department                         daford%watdragon@waterloo.csnet
U. of Waterloo       daford%watdragon%waterloo.csnet@csnet-relay.arpa