HP Surestore 1200ex Optical Drive and Library SCSI-2 Command Reference - Page 92
Allocation, Length, Table 2-48, Mode Sense Header, Table 2-49, Mode Sense Descriptor
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SCSI-2 Drive Commands Table 2-48 Table 2-49 SCSI-2 Drive Command Set Mode Sense (Group 0) Command (1AH) Allocation Length This field specifies the number of bytes that the initiator has allocated for returned data. A length of 0 indicates that no data will be returned. The drive will terminate the data-in phase when the allocation length has been transferred or when all available data has been transferred to the initiator. Mode Sense Header Byte 7 6 5 4 3 2 1 0 0 Mode Data Length 1 Medium Type 2 WP Reserved Cache (1) Reserved (0) 3 Block Descriptor Length Mode Sense Descriptor Byte 7 6 5 4 3 2 1 0 0 Density Codes 1 Number of Blocks (MSByte) 2 Number of Blocks 3 Number of Blocks (LSByte) 4 Reserved (0) 5 Block Length (MSByte) 6 Block Length 7 Block Length (LSByte) Chapter 2 2-55