3.1 Control/Sense CommandsC141-C010 3-33Table 3.1 MODE SENSE Data Type SpecificationsPC Type of Parameter Transferred to the INIT00 Current Values:Reports each "Current" parameter value. The "Current" values are either of the following values.• Values specified by a MODE SELECT or MODE SELECT EXTENDED command which is finallynormally terminated.• When a MODE SELECT or MODE SELECT EXTENDED command is not executed after the power isswitched on, after a RESET condition or after a BUS DEVICE RESET message issued by any INIT isreceived, the same values as "Save" values. However, if "Save" values do not exist for parametersother than those on Page 3 and Page 4 (excluding byte 17), the same values as "Default" values.01 Variable Values:The INIT reports variable parameter fields and parameter bits through the MODE SELECT or MODESELECT EXTENDED command. A "1" is reported in the variable fields and bit positions in each pagedescriptor and "0" is reported in the fields and bit positions which cannot be changed. See the descriptionof each page descriptor for the MODE SELECT command (Section 3.1.5) concerning the variability ofeach parameter.10 Default Values:Reports the "Default" value of each parameter. See the description of each page descriptor for the MODESELECT command (Section 3.1.5) concerning the actual default value of each parameter.11 Save Values:Reports the "Save" value of each parameter. The "Save" values are either of the following values.• For parameters other than those on Page 3 and Page 4 (excluding byte 17), these are the values specifiedin a MODE SELECT or MODE SELECT EXTENDED command in which the "SP" bit after the finalexecution is completed is "1." When a MODE SELECT or MODE SELECT EXTENDED command inwhich the "SP" bit is "1" is not executed (when "Save" values do not exist), these are the same values asthe "Default" values.• The values in the parameters in Page 3 and Page 4 (excluding byte 17) are the values save to the diskmedia during execution of the FORMAT UNIT command.The "Transfer Byte Length" field in the CDB specifies the total number of bytes of MODE SENSE datawhich can be transferred to the INIT by this command. The IDD transfers the number of bytes of all theMODE SENSE data specified in the "Page code" field or the portion of MODE SENSE data with thelength specified in the "Transfer Byte Length" field, whichever is smaller. When zero is specified in the"Transfer Byte Length" field, this command is terminated without anything being transferred.Figure 3.11 shows the data configuration in the parameter list (MODE SENSE data) transferred to theINIT by this command. The parameter list consists of a 4-byte header, an 8-byte block descriptor andone or more page descriptors, specified in the CDB, which are transferred in order. However, when "1"is specified in the DBD bit of the CDB, the block descriptor is not transferred. Also, when X '00' isspecified in the "Page code" field of the CDB, the page descriptor is not transferred.
