Function 44h I/O Control for Devices (IOCTL) Get or Set Device Information entry AH 44h AL 04h Read From Block Device (drive number in BL) BL drive number (0=default) CX number of bytes to read DS:DX pointer to buffer return AX number of bytes read
entry AH 44h
AL 04h Read From Block Device (drive number in BL)
BL drive number (0=default)
CX number of bytes to read
DS:DX pointer to buffer
return AX number of bytes read