Read Block Limits Command
August 2016 Commands 155
Read Block Limits Command
The Read Block Limits command establishes the longest and shortest record size
supported by the tape drive. This command returns six bytes of data.
• When the DIV feature is not enabled the Maximum Block Length reported by the
Read Block Limits command is 2,097,152 bytes.
• When the DIV feature is enabled the Maximum Block Length reported by the
Read Block Limits command is increased by 4 bytes to account for the extra bytes
of PI data (2,097,156 bytes).
Read Block Limits Data
TABLE 3-107 Read Block Limits Command
Byte
Bit
76543210
0 Operation Code (05h)
1
thru
4
(MSB)
Reserved
(LSB)
5 Control Byte
TABLE 3-108 Read Block Limits Data
Byte
Bit
76543210
0 Reserved Granularity
1
thru
3
(MSB)
Maximum Block Length
(LSB)
4
thru
5
(MSB)
Minimum Block Length
(LSB)
Parameter Value
Granularity 0
Maximum block length 2,097,152 bytes (standard)
2,097,156 bytes (with the DIV feature)
Minimum block length 1 byte
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