Twin Format layer to play selection issue for PC software player

[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,

May I ask questions?

3. Regarding the autoplay disc content scanning

I may misunderstand this. So the file system on the last session has file
system information of all files in all sessions. Explorer shows ICONs of
files. Where is the ICON data of EXE file stored? Where is the allocation
information stored?
If same file name are used in 1st session and in 2nd session, what happens?


5. "Anyway UDF

If a PC system that does not have UDF 2.5/2.6, the PC manufacturer may
select DVD-ROM format layer as the default mount layer. Then user can see
the files in the disc. After such HD playback software runs, HD layer is
mounted, then HD contents will be played back.
Assumed demerit of this scenario is that when HD playback software is
crashed, OS file system cannot recover data reading from the DVD layer.

Assumed demerit of the multi-session scenario is that the hybrid disc is
not visible on such PC system. Then how the autorun works?

Best regards,

Keiji Katata
PIONEER CORP.





"David Burg" <dburg at nero.com>@avc-pioneer.com on 2005/08/12 01:33:45

mtfuji5 at avc-pioneer.com$B$KJV?.$7$F$/$@$5$$(J

$BAw?.<T(J:     owner-mtfuji5 at avc-pioneer.com




$B08 at h(J:  <mtfuji5 at avc-pioneer.com>
cc:    <t10 at t10.org>
bcc:
$B7oL>(J:  RE: Twin Format layer to play selection issue for PC software player

Hello Katata-san,

I have as well not decided anything yet, but I'll jump in regarding the
file
system. ;-)

3. Regarding the autoplay disc content scanning at insertion, this is done
|from a user mode component doing regular file system access. Henry
mentioned
in a later e-mail he propose to minimize the reference from high definition
layer to low definition layer. Accordingly, assuming that the file system
will mount the highest session like Windows does today, the content
scanning
will generate only if not mostly access to a single layer.

5. "Anyway UDF
2.5/2.6 is necessary for Blue media. So we may not need to talk about such
old OS. Because the system cannot mount the disc."

Sorry this is not correct for Video disc. Video playback software are used
to perform block access and parse the filesystem themselves. Hence they are
not bind to the OS for the reading of the file system. For instance, Nero
ShowTime is able to read Temp_VMGI video discs although the OS does not
understand its file system. The same is likely to apply to UDF 2.50/2.60.

Best regards,

David Burg,
Nero AG
.



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