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From: Julian Elischer <julian@jhome.DIALix.COM>
Message-Id: <199512291712.BAA00868@jhome.DIALix.COM>
Subject: Re: SCSI II CDROM fails to play
To: joerg_wunsch@uriah.heep.sax.de
Date: Sat, 30 Dec 1995 01:12:46 +0800 (WST)
Cc: current@freefall.freebsd.org
In-Reply-To: <199512291542.QAA28686@uriah.heep.sax.de> from "J Wunsch" at Dec 29, 95 04:42:37 pm
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> 
> 
> 
> SONY has a very weird understanding of the SCSI 2 standard in that
> their MODE SELECT command doesn't allow the medium type field that it
> was just spitting out with a MODE SENSE.  The fix would be to always
> MODE SELECT with a medium type field of 0 (as pointed out by Stu [?]).
while it is common usage to allow fields to be moved directly from
MODE_SENSE to MODE_SELECT, it is in fact the case that 
this is not always required by the standard.. In fact the 
mode-page descriptor in the mode select/sense command itself has a field
that should be set differently..

certainly it does not make much sense to tell a read-only device
what kind of media it has in it.. so Maybe SONY were being
a little "TOO CLEVER", but they are not wrong..

It's actually a GREAT IMPROVEMENT as some of the early SONY
drives didn't seem to follow SCSI-2 at all with regards to Sound..


julian