HP C2246 Technical Reference Manual page 72

Mode Select, Mode Sense
PF (Page Format) A PF bit set to one (1) indicates that the data is sent in the SCSI-2 page
format. When set to zero (0), the data is sent in the vendor unique format. For this product
both formats are the same and the PF bit is ignored.
SP (Save Page} This bit indicates that the Target should save any savable pages sent with this
command. If the SP bit is set to one (1), the current block size will also be saved.
Parameter List Length This field specifies the length in bytes of the MODE SELECT
parameter list that will be transferred during the Data Out phase. A parameter list length of
zero indicates that no data will be transferred. This condition is not considered as an error. If
non-zero, the parameter length must contain a header and optionally a Block Descriptor (if
Block Descriptor Length is 8) and optional Parameter Pages.
The currently supported Mode Select Pages are:
Page Codes Parameter Pages
OlH Read Write Error Recovery Pa.ramders
02H Device Disconnect/Reconnect Parameters
03H Direct Access Device Format Parameters
04H Rigid Disk Drive Geometry Parameters
08H Cache Control Parameters
09H Peripheral Device Parameters
OAH Control Mode Parameters
The minimum page length accepted is 2 bytes (page code plus length). The Page Length field
must exactly match the values supplied in the Mode Sense data. Illegal parameter lengths will
result in a Status of CHECK CONDITION", a Sense Key of ILLEGAL REQUEST, and an
Additional Sense Key of INVALID FIELD IN CDB.
A-16 SCSI Command Descriptions
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