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Began to describe TAO multi-session CD writing

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Thomas Schmitt 2007-01-19 20:54:11 +00:00
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Content:
- TAO Multi-Session CD Cookbook
- Overwriteable DVD Cookbook
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TAO Multi-Session CD Cookbook
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Guided by reading mmc-r10a.pdf , O.8 "Write a Track"
from http://www.t10.org/ftp/t10/drafts/mmc/
backed by reading mmc5r03c.pdf from http://www.t10.org/ftp/t10/drafts/mmc5/
by reading spc3r23.pdf from http://www.t10.org/ftp/t10/drafts/spc3/
and by experiments with drives NEC ND-4570A, LG GSA-4082B, LITE-ON LTR48125S
which used in part code from http://icculus.org/burn.
For libburnia.pykix.org by Thomas Schmitt <scdbackup@gmx.net>
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Media type can be recognized by Current Profile from 46h GET CONFIGURATION.
(mmc5r03c.pdf 6.6.2.1)
CD-R 0009h
CD-RW 000ah
The following topics are covered:
- About blank, appendable and finalized CD media
- Writing a session to CD
- Obtaining CD multi-session info for extending ISO-9660 filesystems
- Obtaining a Table Of Content from CD >>> under construction
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About blank, appendable and finalized CD media :
CD media have to be blank or appendable in order to be writeable in TAO mode.
The according status may be inquired by 51h READ DISC INFORMATION requesting
Data Type 000b Standard Disc Information, where reply value Disc Status
indicates:
00b blank
01b appendable
10b finalized
11b others (unsuitable for this recipe)
(mmc5r03c.pdf 6.22.3.1.4)
CDs which are finalized or appendable may be blanked by command A1h BLANK with
blanking types 000b "Blank the disc" or 001b "Minimally blank the disc".
The Start Address/Track Number will be ignored so it may well be 0.
Because the operation is long running it is advised to set the Immed bit and to
watch the progress by commands 00h TEST UNIT READY and 03h REQUEST SENSE
with DESC bit set to 0 for fixed format reply.
It is done when 00h succeeds and 03h reports 0 in PROGRESS INDICATION
(byte 1+2 in Table 22 = byte 16+17 SENSE KEY SPECIFIC in table 26).
(mmc5r03c.pdf 6.2 BLANK)
(spc3r23.pdf 4.5.2.4.4 table 22, 4.5.3 table 26,
6.27 REQUEST SENSE, 6.33 TEST UNIT READY)
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Writing a session to CD :
The writing method for blank or appendable media is the same. If the media is
blank then the new track will be the first and only one in the table of
content. If the media is appendable then a new session will be opened
automatically and the new track will be the first and only one in this session.
Speed may be set by BBh SET CD SPEED parameter Drive Write Speed. Note that
kbytes/sec means 1000 bytes/sec and not 1024/sec. Rotational control should
be set to 00b. 1x CD speed is 176.4 kbytes/sec. Speed is usually set to the
next lower possible value by the drive. So it is helpful to add a few
kbytes/sec just in case the drive has rounding problems.
(mmc5r03c.pdf 6.37)
Before writing can occur, a Write Parameters mode page 05h has to be composed
and transmitted via 55h MODE SELECT. Mode page 05h describes several burn
parameters:
BUFE Buffer Underrun protection 0=off, 1=on
Test Write -dummy mode for writing 0=off, 1=on
Write Type Packet/TAO/SAO/RAW 01h = TAO
Multi-session Wether to keep appendable 00b = close, 11b = appendable
Track Mode Describes frame type 4 for data , 0 for audio
Data Block Type Layout of payload blocks 8 for 2048 byte data blocks
0 for 2352 byte audio blocks
Audio Pause Length 150 = 2 seconds
Any other parameters may be set to 0.
Mode page data as of MMC-5 table 644 are preceded by a Mode Parameter Header
as of SPC-3 table 240. This 8-byte header may be filled with 0s ... obviously.
(mmc5r03c.pdf 7.5.4 The Mode Page, 4.2.3.4 Table 17 CONTROL = Track Mode)
(spc3r23.pdf 6.8 MODE SELECT, 7.4.3 Mode parameter header formats)
Writing has to begin at the address returned by 52h READ TRACK INFORMATION
with Address/Number Type set to 01b and Logical Block Address/Track/Session
Number set to FFh. The Next Writeable Address as of table 500 is the number
to start writing with.
(mmc5r03c.pdf 6.27 )
Writing is done by 2Ah WRITE with the Logical Block Address counted up from
the initial number in sync with the number of blocks written. Only full blocks
can be written.
(mmc5r03c.pdf, 6.44)
When writing is done, it is mandatory to force the drive's buffer to media by
35h SYNCHRONIZE CACHE.
(mmc5r03c.pdf, 6.41)
The track has to be closed by 5Bh CLOSE TRACK SESSION Close Function 001b.
Older MMC specifies a valid Logical Track Number FFh to depict the open track.
MMC-5 is quite silent about this. FFh works for my drives.
After that, a new track can be written beginning with sending the mode page 05h
again (it is not tested wether this can be omitted).
(mmc5r03c.pdf 6.3.3.1.2)
After the last track of a session, 5Bh CLOSE TRACK SESSION Close Function 010b
with Logical Track Number 0 closes the session. It depends on the Multi-Session
value in mode page 05h wether the disc is finalized or stays appendable.
(mmc5r03c.pdf 6.3.3.1.3)
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Obtaining CD multi-session info for extending ISO-9660 filesystems :
Program mkisofs expects two numbers with its option -C which describe the
situation on an appendable CD which already contains a ISO-9660 filesystem
in the first track of the last session.
The first number is the Logical Block Address of that track containing the
existing ISO-9660 filesystem image. This number is needed for mkisofs option
-M to connect to the existing image. The new image will refer to files in
the previously existing image. mkisofs option -M needs read access to the
CD or a blockwise copy of it on hard disk.
Untested is Format 0001b which in table 478 promises quick access via
Start Address of First Track in Last Session.
(mmc5r03c.pdf 6.26.3.3.1)
libburn gets the number from its Table Of Content model which is obtained
by 43h READ TOC/PMA/ATIP, Format 0010b. See below.
The second number is an exact prediction of the Logical Block Address of the
new track which will contain the newly generated ISO-9660 image.
Even without option -M this second number is still needed to make the inner
block address pointers of the image match the Logical Block Addresses on CD.
This number is the address returned by 52h READ TRACK INFORMATION with
Address/Number Type set to 01b and Logical Block Address/Track/Session
Number set to FFh. The Next Writeable Address as of table 500 is the number
to use.
(mmc5r03c.pdf 6.27 )
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>>> Obtaining a Table Of Content from CD :
Table of content information is gained by 43h READ TOC/PMA/ATIP, Format 0010b.
The number of sessions is given by Last Complete Session Number.
The number of TOC Track descriptors is: (TOC Data Length - 2)/11 .
>>> sift out the track entries
>>> track starts, leadout starts
(mmc5r03c.pdf 6.26.2.5 table 478, 6.26.3.4 )
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Overwriteable DVD Cookbook
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