Western Digital T13/2132-D - Manual (Page 53)

June 23, 2010 T13/2132-D Revision 3
Working Draft Enhanced Disk Drive - 4 (EDD-4) 41
8.13 Identify Device Information (FN 25h)
This function shall be used return IDENTIFY DEVICE information from the device.
Entry
AH 25h
DL BIOS device number
ES:BX Pointer to 512 byte buffer for IDENTIFY DEVICE information. See ACS-2 for details.
Exit
Carry Clear Function completed without error
AH Shall be cleared to zero
ES:BX Pointer to IDENTIFY DEVICE information
Carry Set Function completed with an error
AH Shall be set to the error code