SCSI Commands: 32BREAD POSITION Page 1463.20.2 READ POSITION DataThe READ POSITION command returns a block of READ POSITION Data.The following table shows the fields in the READ POSITION Data when the Longand TCLP bits are set to zero.ByteBits7 6 5 4 3 2 1 00 BOP EOP Reserved BPU Reserved1 Partition Number (0)2 Reserved3 Reserved4 (MSB)567First Block Location(LSB)8 (MSB)91011Last Block Location(LSB)12 Reserved13 (MSB)1415Number of Blocks in Buffer(LSB)16 (MSB)171819Number of Bytes in Buffer(LSB)3.20.2.1 READ POSITION Short Form Field DescriptionsField Bytes Bits DescriptionBOP 0 7 0 = The current logical position is not at BOP.1 = The current logical position is at Beginning-of-Partition (BOP).EOP 0 6 0 = The current logical position is not between early warning andend-of-tape.1 = The current logical position is between early warning and end-of-tape.BPU 0 2 0 = First Block Location and Last Block Location fields are valid.1 = First Block Location and Last Block Location fields are invalid.PartitionNumber1 This field is always 0.First BlockLocation4-7 The block address of the current logical position.Last BlockLocation8-11 The block address of the current logical position. Always the sameas First Block Location.
