Read Position Command; Table 3-114 Read Position Command - Oracle StorageTek T10000 Reference Manual

Read Position Command

The Read Position command returns information about the current logical and
physical block address of the tape. This command returns 20 or 32 bytes of data
depending on the service action.

TABLE 3-114 Read Position Command

Byte 7
0
1
2 (MSB)
thru
6
7 (MSB)
thru
8
9 PPI
Parameter
Service Action
Allocation Length
PPI: Physical Position Indicator
August 2016
6 5
Operation Code (34h)
Reserved
Value
00h = Return short form data (20 bytes)
01h = Return Short form data
02h = Return physical position indicator data (32 bytes) if PPI
= 1
06h = Return long form data
0000h = 20 or 32 bytes returned depending on service action
0 = Return Normal read position
1 = Return Physical Position Indicator data
Bit
4 3
Service Action
Reserved
Allocation Length
Control Byte
Read Position Command
2 1 0
Commands 159
(LSB)