Western Digital T13/2132-D - Manual (Page 70)

T13/2132-D Revision 3 June 23, 2010
58 Working Draft Enhanced Disk Drive - 4 (EDD-4)
8.21 Get Extended Media Change Status (FN 49h)
This function returns media change status. If it returns with CF = 1b, the media may not have been changed.
The media change notification may be activated by unlocking and locking the device door without removing the
media. This function corresponds to INT 13h FN 16h, but explicitly allows any device number to be passed in. If
a non-removable device supports the Device Locking and Ejecting interface subset, this function shall return
with success, AH = 00h, CF = 0b. This function shall clear the media change notification on exit.
Entry
AH 49h
DL BIOS device number
Exit
Carry Clear Function completed without error
AH Shall be cleared to zero to indicate change-line inactive
Carry Set Function completed with an error
AH Shall be set to 06h to indicate that change-line is active. Other values
indicate other error conditions.