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More info about Current/Maximum Capacity Descriptor

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Thomas Schmitt 2007-01-18 14:33:53 +00:00
parent a001f96b21
commit 7addf0d5b5
1 changed files with 15 additions and 10 deletions
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doc/cookbook.txt
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@ -38,25 +38,30 @@ It is advised to set only speeds and sizes which are returned by ACh.
Optimal performance is promised without any speed setting. But my experiments Optimal performance is promised without any speed setting. But my experiments
showed that SET STREAMING values persist after media change. showed that SET STREAMING values persist after media change.
In formatted areas of the media, coarse random access is possible. In the formatted area of the media, coarse random access is possible.
For DVD-RAM and DVD+RW write addresses and data size need to be aligned For DVD-RAM and DVD+RW write addresses and data size need to be aligned
to 2 KiB. For DVD-RW alignment has to be 32 KiB. Within these limitations to 2 KiB. For DVD-RW alignment has to be 32 KiB. Within these limitations
the write address is at the discretion of the sending program. the write address is at the discretion of the sending program.
Just use 2Ah WRITE to send data. Just use 2Ah WRITE to send data.
(mmc5r03c.pdf, 6.44) (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)
Not yet formatted areas may be completely forbidden or they may be allowed The size of the formatted area can be inquired by 23h READ FORMAT CAPACITIES.
for sequential writing (DVD-RW Intermediate state) or they may be allowed The Number Of Blocks value in the Current/Maximum Capacity Descriptor gives
for random access only after the necessary waiting time for formatting to reach this size in 2 KiB blocks. But this is true only if Descriptor Type is 10b
("Formatted Media").
(mmc5r03c.pdf, 6.24.3.2.1, 6.24.3.2.3)
Not yet formatted area may be completely forbidden or they may be allowed for
sequential writing (DVD-RW Intermediate state) or they may be allowed for
random access only after the necessary waiting time for formatting to reach
the desired address (DVD+RW with background formatting active). the desired address (DVD+RW with background formatting active).
Already written areas can be overwritten without special precaution. Already written areas can be overwritten without special precaution.
Blanking a DVD-RW actually destroys its formatting. Blanking a DVD-RW actually destroys its formatting.
When writing is done, it is mandatory to force the drive's buffer to media by
35h SYNCHRONIZE CACHE.
(mmc5r03c.pdf, 6.41)
Most of the concepts usually expressed in Write Parameters mode page 05h do not Most of the concepts usually expressed in Write Parameters mode page 05h do not
apply to the recipes here: Test-Write, Buffer Underrun protection, apply to the recipes here: Test-Write, Buffer Underrun protection,
@ -90,8 +95,8 @@ DVD+RW reaches this state if Background Formatting is allowed to finish without
being stopped by 5Bh CLOSE TRACK SESSION. being stopped by 5Bh CLOSE TRACK SESSION.
(mmc5r03c.pdf, 6.5 FORMAT UNIT, 6.5.4.2.14 Format Type = 26h) (mmc5r03c.pdf, 6.5 FORMAT UNIT, 6.5.4.2.14 Format Type = 26h)
The formatting state of a DVD+RW may be inquired by 51h READ DISC INFORMATION The formatting state of a DVD+RW may be inquired by 51h READ DISC INFORMATION
requiring Data Type 000b "Standard Disc Information". In the reply, BG Format 3 requesting Data Type 000b "Standard Disc Information". In the reply,
indicates fully formatted media. BG Format 3 indicates fully formatted media.
(mmc5r03c.pdf 6.22.3.1.13) (mmc5r03c.pdf 6.22.3.1.13)