summary of PIONEER's proposal about DVD-RW
keiji_katata at post.pioneer.co.jp
keiji_katata at post.pioneer.co.jp
Wed Oct 13 04:25:35 PDT 1999
* From the T10 Reflector (t10 at t10.org), posted by:
* keiji_katata at post.pioneer.co.jp
I'm Keiji Katata of PIONEER. I would like to announce the summary of
PIONEER's proposal about DVD-RW that was explained in Oct. Mt.Fuji4
meeting in Japan. All delivered documents are available on ftp site
ftp.avc-pioneer.com/Mtfuji4/Proposal/Oct99/RWSWG/. Please refer to them
About characteristic of DVD-RW media:
Currently, DVD-RW Book Ver. 0.9 is published.
DVD-RW has 2 different mode on the media. One is DVD-R compatible
sequential mode. Other is DVD-RW restricted over write mode. In the case
of DVD-R compatible sequential mode, Disc At Once recording and
Incremental recording are available. They are compatible with DVD-R.
Blank (Empty) media is DVD-R compatible sequential mode.
In the case of DVD-RW restricted over write mode, Over-writing is allowed
on each written ECC Block. Between Lead-in/Border-in and
Lead-out/Border-out, all sectors shall be recorded, no unwritten sectors
are allowed. Linking is done at Link Point and any Link does not have
Linking Loss. The method 2 addressing of CD-RW or similar mechanism is
not defined. DVD-RW does not have Spare Area. Hardware defect management
is not defined. Intermediate Border State is newly defined. It allows
quick formatting and incremental like recording on DVD-RW restricted over
DVD-R/-RW has RMA (Recording Management Area) which is similar to PMA of
CD. The usage and format of RMA are different for each mode. In the case
of DVD-R compatible sequential mode, data is appended sequentially in
RMA. In the case of DVD-RW restricted over write mode, over-writing is
used for data recording in RMA.
About Model and Commands for DVD-RW device:
PIONEER proposes Model section and several commands modification for
DVD-RW. The Key points follows.
1. Over-writing is not allowed on DVD-R compatible sequential mode.
2. 32K (ECC block boundary) packet size is defined for DVD-RW restricted
over write mode.
3. A WRITE Command shall start from ECC boundary and shall end at ECC
4. Device does not perform any Hardware defect management and verify
5. To enter the media and device into DVD-RW restricted over write mode,
FORMAT UNIT Command is used.
6. To enter the media and device into DVD-R compatible sequential mode,
BLANK Command is used.
7. Write Parameter Mode Page 05h is not used for DVD-RW restricted over
No.1, 3 and 7 are unique (different) comparing with CD-RW. Anyway all
Min, Sec, Frame depending commands do not work correctly or have some
restrictions for DVD media e.g. Read TOC/ATIP/PMA command.
I have an new discussion item that is DVD-RW device can perform the
optimization/re-ordering of the writing of buffered data or can not. In
the case of the device that has Hardware defect management, any writing
may be finished successfully. But in the case of DVD-RW, because of no
hardware defect management, a writing may be failed. If device does not
perform optimization/re-ordering on data writing of buffered data, host
can detect what WRITE commands were finished and what WRITE commands were
not finished due to an error via sense data. If device performs
optimization/re-ordering on data writing of buffered data, host shall
control a session for each writing to identify what WRITE Commands were
not finished, when a WRITE Command was terminated with CHECK CONDITION.
Anyway after issuing WRITE Commands, host shall issue READ Command to
verify the result. (VERIFY Command is better than READ Command?)
I would like to explain our proposal in the next MMC/Fuji meeting on Oct.
T10 week. If you have any question, opinion or claim for DVD-RW, please
attend the meeting or send Email to the reflector.
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