More info about Current/Maximum Capacity Descriptor
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@ -38,25 +38,30 @@ It is advised to set only speeds and sizes which are returned by ACh.
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Optimal performance is promised without any speed setting. But my experiments
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showed that SET STREAMING values persist after media change.
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In formatted areas of the media, coarse random access is possible.
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In the formatted area of the media, coarse random access is possible.
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For DVD-RAM and DVD+RW write addresses and data size need to be aligned
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to 2 KiB. For DVD-RW alignment has to be 32 KiB. Within these limitations
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the write address is at the discretion of the sending program.
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Just use 2Ah WRITE to send data.
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(mmc5r03c.pdf, 6.44)
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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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Not yet formatted areas may be completely forbidden or they may be allowed
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for sequential writing (DVD-RW Intermediate state) or they may be allowed
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for random access only after the necessary waiting time for formatting to reach
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The size of the formatted area can be inquired by 23h READ FORMAT CAPACITIES.
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The Number Of Blocks value in the Current/Maximum Capacity Descriptor gives
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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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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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Already written areas can be overwritten without special precaution.
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Blanking a DVD-RW actually destroys its formatting.
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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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Most of the concepts usually expressed in Write Parameters mode page 05h do not
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apply to the recipes here: Test-Write, Buffer Underrun protection,
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@ -90,8 +95,8 @@ 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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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". In the reply, BG Format 3
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indicates fully formatted media.
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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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