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Format of disk address packet

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Offset Size Description

00h

BYTE

size of packet (10h or 18h)

01h

BYTE

reserved (0)

02h

WORD

number of blocks to transfer (max 007Fh for Phoenix EDD)

04h

DWORD

transfer buffer

08h

QWORD

starting absolute block number (for non-LBA devices, compute as (Cylinder * NumHeads + SelectedHead) * SectorPerTrack + SelectedSector - 1)

10h

QWORD

(EDD-3.0, optional) 64-bit flat address of transfer buffer; used if DWORD at 04h is FFFFh:FFFFh