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From: wwilliam@orl.mmc.com (William Williamson, 4289)
Newsgroups: alt.cd-rom
Subject: Re: Mitsumi drive FX series
Date: 25 May 1994 21:29:19 GMT
Organization: Martin Marietta Orlando
Lines: 29
Distribution: world
Message-ID: <2s0fvf$6um@theopolis.orl.mmc.com>
References: <2rvh93$151@falcon.ccs.uwo.ca>
Reply-To: wwilliam@orl.mmc.com
NNTP-Posting-Host: sirius.orl.mmc.com

In article 151@falcon.ccs.uwo.ca, mjscott@valve.heart.rri.uwo.ca (Mike J. Scott) writes:

:There are two things at work here: single speed vs double speed, and
:two different 'formats' (this isn't the right term, but I'm not sure what
:is).  The 'single speed' is ~150k/s while dbl ~300k/s.  The two different
:formats allow something like 570Meg max vs 650Meg max.  I don't know the
:significance of this, but basically, one of these 'formats' (I think the
:650M) will be read faster than the other, resulting in a performance
:boost.
:
Basically, the difference between Mode 1 and Mode 2 formats is the amount
of error correction embedded in the data. Mode 1 has more error correction
than Mode 2. Mode 1 is intended for use with data in which a bit error
could be 'catastrophic', e.g. - executable files. Mode 2 is intended
to be used for data like digital images or digital audio where bit errors
are not as important. So, if
you wanted to publish a CD of WAV files, you could use Mode 2 so as to get
more data on the CD - with the added advantage of being able to read it off
faster due to less overhead caused by ECC. This is a simplistic but
accurate explanation. 

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Gary Williamson                 : My opinions are not those
wwilliam@polaris.orl.mmc.com    : of my employer. Mine are
                                : free. My employer's can be
Orlando, Florida                : had for a price.
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