HP C737990900 - Manual (Page 39)

Commands—Introduction 39
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Reserved A reserved field should always be set to zero. The drive checks reserved fields, and if one is
non-zero then it will reject the command with CHECK CONDITION .
Multi-Byte
Parameter
A multi-byte parameter field in a command is “big-endian”, that is, bit 7 of the first byte of this
field is the most significant.
Control The control field is mainly concerned with the use of linked commands. These are not supported
by the LTO SCSI Command Set, so a CHECK CONDITION will be generated if this field is set to
anything other than zero.
Vendor-Unique This field is ignored by the firmware
NACA 0 The Normal ACA flag is 0, indicating that it is not supported.
Flag 0
Link 0 Linked commands are not supported.