Mode Select Command
August 2016 Commands 91
Mode Select Command
The Mode Select command specifies options and parameters for a device. StorageTek
recommends the host system perform a Mode Sense command before each Mode
Select command to determine the current settings and to avoid any unwanted
alterations to other Mode Select fields.
The Mode Sense command determines which fields can be changed by the Mode
Select command and what the default values are for these fields.
The tape drives support both 6- and 10-byte commands.
Mode Select data consists of a header, an optional block descriptor, and optional page
formatted data:
TABLE 3-47 Mode Select (10)—6 Byte Command
Byte
Bit
76543210
0 Operation Code (15h)
1 Reserved PF Reserved SP
2
thru
3
(MSB)
Reserved
(LSB)
4 Parameter List Length
5 Control Byte
TABLE 3-48 Mode Select (10)—10 Byte Command
Byte
Bit
76543210
0 Operation Code (55h)
1 Reserved PF Reserved SP
2
thru
6
(MSB)
Reserved
(LSB)
7
thru
8
(MSB)
Parameter List Length
(LSB)
9 Control Byte
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