MMC/Mt Fuji: Clarification about R and RW/Rewritable profiles

[David Burg]

* From the T10 Reflector (t10 at t10.org), posted by:
* David Burg <daviburg at windows.microsoft.com>
*
Hello Katata-san,
Thank you for your answer. Your analysis is correct, in particular for CD and
DVD dash where the said profile requests write features to be supported. But
remains the particularity of the DVD plus command set, where the profile does
not request write features to be supported unless the write bit of the
DVD+R/RW feature is one. Still, DVD Read feature is always mandatory, and
this one includes the same READ DISC INFORMATION you mention.
Best regards,
David Burg.
-----Original Message-----
From: owner-mtfuji5 at avc-pioneer.com [mailto:owner-mtfuji5 at avc-pioneer.com] On
Behalf Of keiji_katata at post.pioneer.co.jp
Sent: Sunday, October 15, 2006 11:47 PM
To: mtfuji5 at avc-pioneer.com
Cc: t10 at t10.org; Bhanu Gogineni; Ahmed Tolba
Subject: Re: MMC/Mt Fuji: Clarification about R and RW/Rewritable profiles
Hi David,
----- Question -----
So the question is: Does reporting R and/or RW/Rewritable profile by a drive
mandate that it is capable of recognizing the matching blank R and/or
RW/Rewritable profile?
-------------------
I think it is yes. All commands listed in the Features those are listed in
the
Profile shall work correctly. So for example, CD-R profile requests
"Incremental
Streaming Writable Feature" and "CD Track at Once Feature". These Features
request READ DISC INFORMATION command and READ TRACK INFORMATION command.
Those
information must be reported from any condition of the CD-R disc except fatal
error condition of the drive. I think Blank condition of CD-R is normal
condition of the disc.
On the other hand, these Feature request "This Feature identifies a Drive
that
is able to write data". Therefore ROM drive shall not report the supporting
of
there Features. Then ROM drive cannot report CD-R profile.
Best regards,
Keiji Katata
PIONEER CORP.
David Burg <daviburg at windows.microsoft.com>@avc-pioneer.com on 2006/10/14
14:05:28
mtfuji5 at avc-pioneer.com$B$KJV?.$7$F$/$@$5$$(J
$BAw?.<T(J:	  owner-mtfuji5 at avc-pioneer.com
$B08 at h(J:  <t10 at t10.org>, <mtfuji5 at avc-pioneer.com>
cc:    Bhanu Gogineni <bhanu.gogineni at microsoft.com>, Ahmed Tolba
       <ahmed.tolba at microsoft.com>
bcc:
$B7oL>(J:  MMC/Mt Fuji: Clarification about R and RW/Rewritable profiles
Hello,
During validation of DVD-ROM devices conformance to the MMC command set
through
the Windows Vista Logo program and MMCTest tool, we were signaled the
possible
flaw in either our tool or the specification. Our tool query from the drive
the
list of profiles supported by the drive, and then exercises each of the
profiles. Some ROM drives will also report R and/or RW profiles. Thus our
tool
attempts to validate these profiles, and as part of the validation attempts
to
validate that the drive recognize blank media properly.
Yes, blank media. I understand that hardware manufacturers may very well be
reluctant to guarantee this capability on ROM drives. The value of
recognizing
blank media in a ROM drive that won$B!G(Jt be able to write it is also
questionable.
However there are also positives aspects: a ROM drive able to recognize the
blank media will not spin un-definitively in attempt to find a track, it will
further be capable to report that the media is blank to the host so that the
host software may report the issue to the user and help him to correct his
mistake.
Clearly some ROM drives do not support recognizing blank recordable or
rewritable media, even sometimes do not recognize recorded recordable or
rewritable media.
So the question is: Does reporting R and/or RW/Rewritable profile by a drive
mandate that it is capable of recognizing the matching blank R and/or
RW/Rewritable profile?
Best regards,
David Burg,
Microsoft Corporation.
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