ALP Read Position Command
August 2016 Automatically Linked Partitioning 279
ALP Read Position Command
This vendor unique version of the Read Position command is used to read to the
current ALP index.
TABLE C-5 ALP Read Position Command
Byte
Bit
76543210
0 Page Code (34h)
1 Reserved TCLP LONG BT
2
thru
6
(MSB)
Reserved
(LSB)
7
thru
8
(MSB)
Allocation Length
9 PPI ALP Control Byte
Parameter Value
TCLP: Total Current Logical Position 0 = Return first and last block location
LONG: Long Format 0 = Return 20 bytes of data
1 = Return 32 bytes of data (PPI only)
BT: Block address Type 0 = SCSI logical block address
1 = Vendor specific (ignored)
Allocation Length 0000h = 20 bytes returned (PPI returns 32 bytes)
PPI: Physical Position Indicator 0 = Return Normal read position
1 = Return Read Physical Position Indicator data
ALP ALP vendor unique read position
0 = Normal read position
1 = Read ALP index
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