June 23, 2010

T13/2132-D Revision 3

8.15 Extended Read (FN 42h)

This function shall transfer sectors from the device to memory. In the event of an error, the block count field of the device address packet contains the number of good blocks read before the error occurred.

Entry

AH 42h

DL BIOS device number

DS:SI Pointer to Device Address Packet (see table 9)

Exit

Carry Clear Function completed without error

AH Shall be cleared to zero

Carry Set Function completed with an error

AH Shall be set to the error code

Working Draft Enhanced Disk Drive - 4 (EDD-4)

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Western Digital T13/2132-D manual Extended Read FN 42h