Int 13H [PC] [AT] [PS/2] Function 14H (20) Controller internal diagnostic

Causes the fixed disk adapter to carry out a built-in diagnostic self-test, indicating whether the test was passed by the returned status.

Call with:

AH = 14H

Returns:

If function successful

Carry flag = clear

AH = 00H

If function unsuccessful

Carry flag = set

AH = status (see Int 13H Function 01H)

Note:

This function is supported on fixed disks only.