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Command Specifications
3 - 48 C141-E167
(4) Parameter value
This field indicates actual "threshold value" or "cumulative value". The size of this field differs in
each log parameter.
3.1.17 LOG SENSE (4D)
Bit
Byte
76543210
0X'4D'
1 LUN 0 0 0 PPC SP
2 PC Page Code
300000000
400000000
5 Parameter Pointer (MSB)
6 Parameter Pointer (LSB)
7 Parameter List Length (MSB)
8 Parameter List Length (LSB)
90000000Link
This command provides a means for the application client to retrieve statistical or other operational
information maintained by the device about the device or its logical units.
It is a complementary command to the LOG SELECT command.
The "Parameter Pointer Control (PPC)" bit is not supported. It should be zero.
An "Save Parameters (SP)" bit of zero indicates the device server performs the specified this
command and does not save any log parameters. If saving log parameters is implemented, an "SP"
bit of one indicates that the device server performs the specified this command and saves all log
parameters identified as savable by the "DS" bit to the disc medium.
The "Page Control (PC)" field defined the type of parameter values to be selected (see 3.1.16 for the
definition of the page control field).
The "PC" bits are ignored by the drive. The drive assumes that current cumulative parameters are
selected.
The "Page Code" field identifies which page of data is being requested. If the page code is reserved
or not implemented, the device server terminates the command with CHECK CONDITION status
(ILLEGAL REQUEST [=5] / Invalid field in CDB [=24-00]).
The "Page Code" assignments for the log pages are listed below.