Made clarification about formatting state recognition
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@ -28,9 +28,14 @@ The recipes described here are depending on formatting state:
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- Partly formatted DVD-RW
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- Intermediate state DVD-RW
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-------------------------------------------------------------------------------
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Overwriting in general :
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Depending on media type, some kind of formatting has to have happened before
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data can be written. Formatting may happen separately from writing or
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simultaneously. See the particular recipes below.
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No Write Parameters mode page 05h is to be sent. Speed can be influenced by
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B6h SET STREAMING , speed capabilities can be inquired by ACh GET PERFORMANCE.
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It is advised to set only speeds and sizes which are returned by ACh.
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@ -54,7 +59,7 @@ this size in 2 KiB blocks. But this is true only if Descriptor Type is 10b
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("Formatted Media").
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(mmc5r03c.pdf, 6.24.3.2.1, 6.24.3.2.3)
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Not yet formatted area may be completely forbidden or they may be allowed for
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Not yet formatted areas may be completely forbidden or they may be allowed for
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sequential writing (DVD-RW Intermediate state) or they may be allowed for
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random access only after the necessary waiting time for formatting to reach
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the desired address (DVD+RW with background formatting active).
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@ -80,17 +85,8 @@ software did anything wrong.
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-------------------------------------------------------------------------------
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DVD-RAM, fully formatted DVD+RW or DVD-RW :
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There is no need for any finalizing other than forcing the drive's buffer to
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media by 35h SYNCHRONIZE CACHE (which is mandatory for writing, anyway).
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(mmc5r03c.pdf, 6.41)
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(It seems to do no harm to send to DVD+RW or DVD-RW a 5Bh CLOSE TRACK SESSION
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with Close Function 010b despite there is no session open in this scenario.)
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Full format is the natural state of DVD-RAM.
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DVD+RW reaches this state if Background Formatting is allowed to finish without
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being stopped by 5Bh CLOSE TRACK SESSION.
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(mmc5r03c.pdf, 6.5 FORMAT UNIT, 6.5.4.2.14 Format Type = 26h)
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@ -99,7 +95,6 @@ requesting Data Type 000b "Standard Disc Information". In the reply,
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BG Format 3 indicates fully formatted media.
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(mmc5r03c.pdf 6.22.3.1.13)
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DVD-RW reaches this state either by Format Type 00h (or 10h) with maximum
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size given as Number Of Blocks, or by writing sequentially until the disc is
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completely full into an intermediate session opened by format 15h resp. 13h.
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@ -111,10 +106,20 @@ Media") and 0 blocks are offered with Format Types 13h or 11h.
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See also discussion of unformatted or partially formatted DVD-RW below.
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In fully formatted state there is no need for any formatting before writing nor
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for any finalizing other than forcing the drive's buffer to media by
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35h SYNCHRONIZE CACHE (which is mandatory for writing, anyway).
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(mmc5r03c.pdf, 6.41)
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(It seems to do no harm to send to DVD+RW or DVD-RW a 5Bh CLOSE TRACK SESSION
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with Close Function 010b despite there is no session open in this scenario.)
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-------------------------------------------------------------------------------
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Unformatted DVD+RW
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This is the state of previously unused DVD+RW media.
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The formatting state of a DVD+RW may be inquired by 51h READ DISC INFORMATION
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requiring Data Type 000b "Standard Disc Information".
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In the reply, BG Format 0 indicates unformatted media (or unsuitable media).
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@ -145,6 +150,7 @@ Partly formatted DVD+RW :
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This state is achieved by stopping background formatting before the media
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was completely formmatted.
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The formatting state of a DVD+RW is obtained by 51h READ DISC INFORMATION
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requiring Data Type 000b "Standard Disc Information".
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In the reply, BG Format 1 indicates partly formatted media.
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@ -209,6 +215,13 @@ by 5Bh CLOSE TRACK SESSION, 010b in order to be partly formatted.
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(mmc5r03c.pdf 6.3.3.2.3 CLOSE TRACK SESSION 010b, 6.24 READ FORMAT CAPACITIES)
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Elsewise the media is in Intermediate state. See below.
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A partly formatted DVD-RW can be recognized by 23h READ FORMAT CAPACITIES. The
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Descriptor Type of the Current/Maximum Capacity Descriptor is 10b ("Formatted
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Media") and the Number Of Blocks with formats 00h, 10h or 15h is larger than the
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currently formatted size, resp. more than 0 blocks are offered with Format
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Types 13h or 11h.
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(mmc5r03c.pdf, 6.24.3.2.1, 6.24.3.3)
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If the data of the session surely fit into the formatted area, then it would
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be unnecessary to do any further formatting.
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But in order to make the DVD-RW surely accept its maximum number of bytes,
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@ -219,11 +232,6 @@ writing. As with Format Type 15h it is ok to set Number Of Blocks to 0, so that
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no fixed size formatting work is done and writing can begin soon after.
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(mmc5r03c.pdf, 6.5.4.2.8 Format Type = 13h)
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A fully formatted DVD-RW offers 0 blocks with format 13h. It makes not much
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sense to bring such a full session into Intermediate state because no gain in
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size is possible any more. Rather apply recipe "DVD-RAM, fully formatted DVD+RW
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or DVD-RW" above.
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When writing is done and cache is synced, one should send 5Bh CLOSE TRACK
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SESSION with Close Function 010b in order to bring the session out of
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Intermediate state.
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