Sony SDX-800V/R User Manual

6-8 

 

SONY AIT-3Ex drive SDX-800V series Ver.1.1 

Operation Code (1Bh) 

Reserved IMMED

Reserved 

Reserved 

Reserved 

HOLD EOT 

(0)

RETEN LOAD 

Control 

 
The LOAD UNLOAD command requests that the drive enable or disable the media for further operations. This 
command may also be used to request a retention function. 
 
IMMED: If this bit is set, status is returned as soon as the load or unload operation is initiated. Otherwise, the status 
is returned after the operation has completed. 
 
LOAD: A LOAD bit of one and a HOLD bit of zero indicates the medium in the drive shall be loaded and positioned 
to the beginning-of-partition zero. A LOAD bit of zero and a HOLD bit of zero indicates the medium in the drive shall 
be positioned for removal at the extreme position along the medium specified by the EOT bit. 
 
A LOAD bit of one and a HOLD bit of one indicates if the medium has not been moved into the logical unit, the 
medium shall be moved in but not positioned for access. The EOT and RETEN bits shall be set to zero. Following 
successful completion, the drive shall return GOOD STATUS. If both the medium and drive support MAM, the drive 
shall generate a unit attention condition for all initiators with the additional sense code and additional sense code 
qualifier set to MEDIUM AUXILIARY MEMORY ACCESSIBLE. 
 
A LOAD bit of zero and a HOLD bit of one indicates if the medium is in the drive, the medium shall be unthreaded but 
shall not be ejected. Following successful completion, the drive shall return GOOD STATUS. If both the medium and 
drive support MAM, the drive shall generate a unit attention condition for all initiators with the additional sense code 
and additional sense code qualifier set to MEDIUM AUXILIARY MEMORY ACCESSIBLE. 
 
RETEN: A RETEN bit of one indicates that the drive unit shall perform a retention function on the current medium.  A 
RETEN bit of zero indicates that the drive shall not perform a retention function on the current medium. 
 
EOT: An end-of-tape (EOT) bit of one and a Load bit of ZERO indicates that the medium shall be positioned at 
end-of-medium for removal from the peripheral device. Prior to performing the unload operation, any buffered data 
that is to be written shall be transferred to the medium. An EOT bit of ZERO and Load bit of ZERO indicates that the 
medium shall positioned at beginning-of-medium for removal etc. This drive does not support  this bit. EOT bit of one 
shall cause the target to return CHECK CONDITION status. The sense key shall be set to ILLEGAL REQUEST and 
the additional sense code shall be set to ILLEGAL FIELD IN CDB. This field is not supported. This field should be  
set to 0. 
 
HOLD: A HOLD bit of one indicates MAM shall be accessible upon completion of the command but the medium shall 
not be positioned for access. A HOLD bit of zero and a LOAD bit of one indicates the medium shall be positioned for 
access. A HOLD bit of zero and a LOAD bit of zero indicates MAM shall not be accessible upon completion of the 
command. 
 
If the drive has received an UNLOAD command with the Immediate bit set and then receives either another 
command which would involve tape motion or TEST UNIT READY, the drive will return a CHECK CONDITION 
status with a NOT READY sense key set.