Return Value
Return value of AX register. The meaning of high-order byte (AH):
0x00 No error
0x01 Invalid request or a bad command
0x02 Address mark not found
0x03 Disk write protected
0x04 Sector not found
0x05 Reset failed
0x06 Floppy disk removed
0x07 Drive parameter activity failed
0x08 Direct Memory Access (DMA) overrun
0x09 DMA crossed 64K boundary
0x0A Bad sector flag detected
0x0B Bad track flag detected
0x0C Media type not found
0x0D Invalid number of sectors on format
0x0E Control data access mark detected
0x0F DMA arbitration level out of range
0x10 Data read (CRC or ECC) error
0x11 Corrected data read (ECC) error
0x20 Controller failure
0x40 Seek error
0x80 Disk timed out or failed to respond
0xAA Drive not ready
0xBB Undefined error
0xCC Write fault on drive
0xE0 Status error
0xFF Sense operation failed