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This figure shows the descriptor block for the Data Transfer Element descriptor (DvcID=1).
For PVolTag = 0:
Byte 0 to 1: Element Address
Byte 2: Reserved Bit 7 to 4, Access Bit 3, Except Bit 2, Reserved Bit 1, Full Bit 0
Byte 3: Reserved
Byte 4: Additional Sense Code
Byte 5: Additional Sense Code Qualifier
Byte 6 to 8: Reserved
Byte 9: SValid Bit 7, Invert(0) Bit 6, Reserved Bit 5 to 4, ED Bit 3, Medium Type Bit 2 to 0
Byte 10 to 11: Source Storage Element Address
Byte 12: Reserved Bit 7 to 4, Code Set (2) Bit 3 to 0
Byte 13: Reserved Bit 7 to 4, Identifier Type (0) Bit 3 to 0
Byte 14: Reserved
Byte 15: Identifier Length (n)
Byte 16 to 16+n-1: Identifier (Drive ASCII Serial Number)
Byte 32-n: Identifier Pad
Byte 48: Media Domain
Byte 49: Media Type
Byte 50: Transport Domain
Byte 51: Transport Type
For PVolTag = 1:
Byte 0 to 1: Element Address
Byte 2: Reserved Bit 7 to 4, Access Bit 3, Except Bit 2, Reserved Bit 1, Full Bit 0
Byte 3: Reserved
Byte 4: Additional Sense Code
Byte 5: Additional Sense Code Qualifier
Byte 6 to 8: Reserved
Byte 9: SValid Bit 7, Invert(0) Bit 6, Reserved Bit 5 to 4, ED Bit 3, Medium Type Bit 2 to 0
Byte 10 to 11: Source Storage Element Address
Byte 12 to 47: Primary Volume Tag Information (omitted if PVolTag = 0)
Byte 48: Reserved Bit 7 to 4, Code Set (2) Bit 3 to 0
Byte 49: Reserved Bit 7 to 4, Identifier Type (0) Bit 3 to 0
Byte 50: Reserved
Byte 51: Identifier Length (n)
Byte 52 to 52+n-1: Identifier (Drive ASCII Serial Number)
Byte 32-n: Identifier Pad
Byte 84: Media Domain
Byte 85: Media Type
Byte 86: Transport Domain
Byte 87: Transport Type