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
*



  Hello all,

  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
  for detail.

  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
  write mode.
  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
  boundary.
  4.  Device  does  not  perform  any Hardware defect management and verify
  after write.
  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
  write mode.
  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.

  Best Regards.


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