Described DVD-R[W] DAO mode
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@ -691,12 +691,14 @@ DVD-RW Restricted Overwrite 0013h
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DVD-RW Sequential Recording 0014h
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There are two approaches for writing to sequential DVD-R[W]: DAO and
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Incremental. Not all media and drives offer Incremental which allows multi-
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session as with CD media.
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Incremental. Not all media and drives offer Incremental which allows
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multi-session as with CD media and does not demand a predicted track size.
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DAO seems to be the older method. It allows only one single session and
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track and it demands an exactly predicted track size.
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- About overwriteavble, blank, appendable and finalized DVD-R[W] media
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- Incremental writing
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>>> - DAO writing (missing yet)
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- DAO writing
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- Obtaining DVD-R[W] multi-session info for extending ISO-9660 filesystems
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- Obtaining a Table Of Content from DVD-R[W]
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@ -725,10 +727,9 @@ Finalized, appendable or overwriteable DVD-RW can be brought into blank
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sequential state by command A1h BLANK with blanking type 000b "Blank the disc".
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See TAO Multi-Session CD Cookbook for details about blanking.
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Different from CD it seems unwise to use minimal blanking (type 001b) because
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my two DVD drives do not offer the Incremental Streaming feature 0021h with
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DVD-RW which have been treated this way. cdrecord and cdrskin even stall when
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examining these media (exact command and cause is still to be determined).
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After minimal blanking (type 001b) DVD-RW my two drives do not offer the
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Incremental Streaming feature 0021h the media any more. Full blanking (000b)
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brings back this feature.
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(mmc5r03c.pdf 6.2)
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@ -758,7 +759,7 @@ Multi-Session by the application.
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LS_V Link size valid 1=true
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Test Write -dummy mode for writing 0=off, 1=on
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Write Type Packet/TAO/SAO/RAW 00h = Incremental (Packet)
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Multi-session Wether to keep appendable 00b = finalize(growisofs DAO)
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Multi-session Wether to keep appendable 00b = finalize
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11b = keep appendable
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Track Mode Describes frame type 5 [*1]
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Data Block Type Layout of payload blocks 8 [*2]
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@ -801,26 +802,70 @@ does with TAO CD. So libburn obtains the Last Track Number in Last Session
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from the reply of 51h READ DISC INFORMATION requesting Data Type 000b
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"Standard Disc Information".
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(mmc5r03c.pdf 6.3.3.2.2 CLOSE TRACK, 6.22.3.1.)
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Afterwards 5Bh CLOSE TRACK SESSION Close Function 010b with Logical Track
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Multiple tracks are permissible in a single session. After all of them have
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been written, 5Bh CLOSE TRACK SESSION Close Function 010b with Logical Track
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Number 0 closes the session. It depends on the Multi-Session value in mode
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page 05h wether the disc is finalized or stays appendable.
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(mmc5r03c.pdf 6.3.3.2.3)
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It has not been tested yet wether multiple tracks are permissible in a single
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session.
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-------------------------------------------------------------------------------
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>>> DAO writing : INCOMPLETE AND YET UNEXPLORED
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DAO writing :
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>>> DAO
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DAO is the mode prescribed by feature 002Fh.
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growisofs is_dao in page 05h sets Write Type to 2 "SAO". It is accompanied
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by dvd_compat. Thus Multi-session is set to 0.
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DAO is the mode described by feature 002Fh. This feature also gives information
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about capabilities for Burnfree (BUF), Test Write and DVD-RW.
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(mmc5r03c.pdf 5.3.25)
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Experiments with growisofs showed that the track size needs to be predicted
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and may not be exceeded during the write process. (growisofs ran into SCSI
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errors with piped non-ISO-9660 images and with piped ISO-9660 which have
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trailing data.)
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Speed can be influenced by B6h SET STREAMING , speed capabilities can be
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inquired by ACh GET PERFORMANCE. It is advised to set only speeds and sizes
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which are returned by ACh.
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(mmc5r03c.pdf 6.39 SET STREAMING, 6.8 GET PERFORMANCE)
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The mode page 05h to be sent :
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BUFE Buffer Underrun protection 0=off, 1=on
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LS_V Link size valid 0=false [*3]
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Test Write -dummy mode for writing 0=off, 1=on
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Write Type Packet/TAO/SAO/RAW 02h = DAO (same code as SAO)
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Multi-session Wether to keep appendable 00b = finalize
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Track Mode Describes frame type 5 [*1]
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Data Block Type Layout of payload blocks 8 [*2]
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Link Size ??? 0 [*3]
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FP Fixed Packet Size Bit 0 [*3]
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Packet Size 0 [*3]
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(mmc5r03c.pdf 7.5.4 The Mode Page, 4.2.3.4 Table 17 CONTROL = Track Mode)
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(spc3r23.pdf 6.8 MODE SELECT, 7.4.3 Mode parameter header formats)
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[*1:]
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growisofs takes the Track Mode from 52h READ TRACK INFORMATION, Address/Number
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Type 1, Track 1, Track Information Block byte 5 & 0xf.
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(mmc5r03.pdf 6.27)
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[*2:]
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8 means: 2048 byte data blocks. growisofs sets this value if Data Mode from
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above 52h READ TRACK INFORMATION is 1 or Fh, which is predicted by the specs
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to be always true. (If not: growisofs aborts.)
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(mmc5r03.pdf 6.27.3.10)
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[*3:]
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Link Size, Packet Size and their companions only apply to Write Type 00h.
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>>> only with DAO and leadout : minus_r_reserve_track
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The session layout must be described by 53h RESERVE TRACK, RMZ=ARSV=0.
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Reservation size should better already be aligned to 32 KiB. It has not been
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tested yet, what happens if not enough data get written.
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(mmc5r03c.pdf 6.31)
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Next Writeable Address is fetched from the reply of 52h READ TRACK INFORMATION.
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The reply is supposed to be 0. libburn writes full 32 kB buffers via 2Ah WRITE.
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(mmc5r03c.pdf, 6.27 READ TRACK INFORMATION, 6.44 WRITE)
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If the track source delivers less than the announced size then libburn pads up
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by zeros.
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When writing is done, it is mandatory to force the drive's buffer to media by
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35h SYNCHRONIZE CACHE.
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(mmc5r03c.pdf, 6.41)
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No further finalization is necessary. (I.e. no 5Bh CLOSE TRACK SESSION.)
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-------------------------------------------------------------------------------
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@ -904,7 +949,7 @@ libburn uses Last Track in Last Session as a hint for the range of track
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numbers.
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(mmc5r03c.pdf 6.22)
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Next step ist to iterate from 1 up to the last track number and to obtain
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Next step is to iterate from 1 up to the last track number and to obtain
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the according track info by 52h READ TRACK INFORMATION. Each track tells its
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Session Number (LSB at byte 2, MSB at 33), its Logical Track Start Address,
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its Logical Track Size, and much more which is not needed for a fake CD TOC.
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