SCSI Commands: 14BSCSI Command Descriptor Blocks Page 253.2.2 SCSI Command Operation Code FormatByteBits7 6 5 4 3 2 1 00 Group Code Command Code3.2.2.1 SCSI Command Field DescriptionsField Byte Bits DescriptionGroupCode0 5-7 The SCSI command group.CommandCode *0 0-4 The SCSI command code.NOTE: The Group Code and Command Code together make the Operation Code.3.2.3 SCSI Command Control Byte FormatByteBits7 6 5 4 3 2 1 0Last Vendor Unique Reserved NACA Flag Link3.2.3.1 SCSI Command Control Byte Field DescriptionsField Byte Bits DescriptionVendorUniqueLast 6-7 Not used, always 0.Reserved Last 3-5 All reserved bits must be 0.NACA Last 2 Parallel SCSI Interface: Not supported; reserved.Fibre Channel Interface: Supported.Flag andLink bitsLast 0-1 These bits are not supported by the LTO drive.
