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AH = 42h DL = drive number DS:SI -> disk address packet (see #00272)
Return:
CF clear if successful AH = 00h CF set on error AH = error code (see #00234) disk address packet's block count field set to number of blocks successfully transferred
See Also: AH=02h - AH=41h"INT 13 Ext" - AH=43h"INT 13 Ext"
Format of disk address packet: Offset Size Description (Table 00272) 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
Category: Disk I/O Enhancements - Int 13h - I
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