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DVD
From Free60 Wiki (now removed http://www.free60.org/wiki/DVD)
Table of contents:
1 Models
2 General Information
3 Confirmed Facts
4 Speculation
5 On-Disc format
Models
There are at least two different types of DVD drives used in the 360
* Hitachi-LG GDR-3120L * Toshiba/Samsung TS-H943
General Information
* The 360 has launched with a standard dual layer DVD-ROM drive
manufactured by Hitachi-LG.
* There are two different ROM versions of the Hitachi-LG drive:
0046DH and 0047DJ
* The ROM version is not related to Core or Premium
* DVD-ROM Drive With Manufactured date September 2005 contains Rom
0046DH
* X360 Boots without any error when the DVD-ROM Drive Sata Connector
and the drive its power cable are not connected
* The drive uses the standard 7-pin Serial ATA connectors with a
custom power connector.
* X360 calls it ||DeviceCdRom0|| (found in default.xex)
* The raw file system (beyond the protections) on the disk is
similar to the file system on the original xbox disks. A tool is
already out there that will extract raw ISOs. It is so far unknown
whether game executables are encrypted on the disk, someone with
access to the tool and some ISOs should check.
* Playing games from Harddisk is possible without the DVD-ROM Drive
Confirmed Facts
* The main processor of the LG DVD-ROM drive is an Panasonic
MN103S94FDA
* Allthough present on the disc, The BCA is not used as a security
check.
Speculation
* A 12X DVD-ROM drive (DVD+R/RW) Single or dual-layer DVDs. The
other supported formats are: CD-DA, CD-ROM, CD-R/RW, WMACD, MP3CD,
and JPEG Photo CD and original Xbox games for backwards compatibilty.
* The DVD-ROM doesn't work on a standard pc workstation, yet.
* I found a very very thin ring on the undersite of my DVD (PGR3).
It's located at the inner part of the dvd, it's very very thin so
you have to look very sharp for it= Maybe this is the reason why=
the DVD laser can't read the data part. It reads the video part
and then can't "jump" over the thin ring to read the data part.
* The two different DVD-ROM versions cannot be interchanged between
Xbox 360's
* Maybe the Firmware of the DVD-ROM has an altert TOC-Offset. The
DVD looks at a specific sektor for the TOC. If it finds it there
ist an XBOX360 GAME-DISC. If no TOC can be read the firmware of
the from the BOX tells the dvd-rom to look at sector 0 to identify
normal media (audio-cds, dvd-movie,...). when a game-dvd is found
the first sectores, where the movie ("use the disc in a xbox 360")
where not be read. maybe thats why you cant use the dvd-rom in a
normal computer... because the drive looks not at the normal toc
position. when the drive´s have different commands u cant change
them from one box to an other... it must be stored somewhere which
drive was build in
On-Disc format
360 discs, like Xbox1 discs, have a lower number of sectors encoded in their dvd structure data. This makes it "impossible" to access the data after the "leadout" (or at least what is specified as leadout). The "standard" area has 0xDB0 (~7MB) sectors, and contains DVD-Video data, telling you that this is a game disc. Game data is stored at sector offset 0x1FB20 (LBA), so it's "after the leadout". The data itself, however, is stored dvd-compliant (standard ECC, standard seed, standard EDC, standard sector layout. How boring.). If you can get your drive to read past the specified end-of-disc, you can read the game data.
A specific sector region, between the standard-data and the beginning of the game data can't be read. I guess this is the "ring" which is visible. It probably contains empty/weak sectors (reading really broken frames is always a bit difficult. Someone with the proper equipment might want to check this).
The tools which can be used for this are basically the same as for Xbox1, just that the data offset was different there. There are "scene-tools" which are of course so top secret that you never heard about them which can do this. They can be hacked for xbox360 (by just modifiying the read offset), and there you go.
(Of course the "how to get your drive's firmware to do this" is highly off-topic here, but it usually boils down to using debug ATAPI command to write in the drive's memory, then modifiying the drive's idea of the "end-of-disc", then using normal read commands. Some others say just opening up the DVD-Rom drive from inside out, Inserting a large DVD, then lifting it up vertically to do not trigger the eject mode, and then inserting a Original XBOX disc will also give you access)
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