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

[keiji_katata at post.pioneer.co.jp]

* From the T10 Reflector (t10 at t10.org), posted by:
* keiji_katata at post.pioneer.co.jp
*
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$$(B
$BAw?.<T(B:	  owner-mtfuji5 at avc-pioneer.com
$B08 at h(B:  <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:
$B7oL>(B:  MMC/Mt Fuji: Clarification about R and RW/Rewritable profiles
Hello,
During validation of DVD-ROM devices conformance to the MMC command set
through
the Windows Vista Logo program and MMCTest tool, we were signaled the
possible
flaw in either our tool or the specification. Our tool query from the drive
the
list of profiles supported by the drive, and then exercises each of the
profiles. Some ROM drives will also report R and/or RW profiles. Thus our
tool
attempts to validate these profiles, and as part of the validation attempts
to
validate that the drive recognize blank media properly.
Yes, blank media. I understand that hardware manufacturers may very well be
reluctant to guarantee this capability on ROM drives. The value of
recognizing
blank media in a ROM drive that won$B!G(Bt 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.
*
* For T10 Reflector information, send a message with
* 'info t10' (no quotes) in the message body to majordomo at t10.org