I have a historical question
regarding CD/DVD support for Mode Page 18h. Since this is such an old
topic, a private e-mail reply from those in the know would be appreciated.
Mode Page 18h is defined in SPC
as the “Protocol Specific LUN” page. MMC and Mt. Fuji for
many years have defined this page as reserved and it generally is not used by
optical drives.
However, there are still some
relatively new drives that do return Mode Page 18h. They are not
returning a Protocol Specific LUN page. They are instead returning the very
old “Feature Set Support & Version Page.”
Information on this mode page is
hard to come by. Here is what I have found. This page was defined
in an early MMC-2 draft specification but was dropped before MMC-2 was
released. It was also documented in Revision 0.99 of the Mt. Fuji 1
specification (defined in 1997). Unfortunately I do not have the 1.0
release of the Mt. Fuji1 specification, nor is it available on the Mt.
Fuji FTP site, so I do not know if it ever made it into the official
specification.
My question is this.
Was this mode page ever officially defined in a released specification or was
it proposed in a draft specification and then dropped?
I need to know this so I can
gauge the severity of a drive supporting this page. If it was never
officially defined, then I will consider this a firmware bug. If it was
once officially defined, then it is simply an obsolete mode page.
Here is a screenshot of this
specific mode page (assuming the reflector does not strip the graphic image):
Regards,
-------
Mike Berhan
busTRACE Technologies
9700 Village Center Drive
Suite 50-F
Granite Bay, CA 95746
916.773.4554 phone
916.218.6283 fax