GET PERFORMANCE/READ CAPACITY in MMC 4r03b
jdu at ashampoo.com
Fri Sep 24 04:24:37 PDT 2004
* From the T10 Reflector (t10 at t10.org), posted by:
* Jan-Eric Duden <jdu at ashampoo.com>
I have a question regarding the specifications of the GET PERFORMANCE
and READ CAPACITY commands (MMC4r03b).
If write speed descriptors (type 3h) are requested through the GET
PERFORMANCE command the specification states in 188.8.131.52 :
"The End LBA field shall indicate the medium capacity if a medium is
mounted. The value shall be
same as the value reported by READ CAPACITY command. If no medium is
mounted, the Logical
Unit shall report the maximum capacity of the most appropriate media. "
The READ CAPACITY specification states in 6.23.1 :
"This capacity is reported with respect to reading operations." and in
"DVD, non MRW-format: The last addressable user data block (= Last
Recorded Address) in the last track of
the last complete session"
This means that the End LBA in both cases is the Last Recorded Address,
which is not necessarily the medium capacity.
Setting the End LBA field of a write speed descriptor to the Last
Recorded Address doesn't seem to be correct.
Am I missing something?
MfG / Regards
ashampoo Technology GmbH & Co. KG
* For T10 Reflector information, send a message with
* 'info t10' (no quotes) in the message body to majordomo at t10.org
More information about the T10