INT 13 - HARD DISK - SEEK TO CYLINDER
        AH = 0Ch
        CH = low eight bits of cylinder number
        CL = sector number (bits 5-0)
             high two bits of cylinder number (bits 7-6)
        DH = head number
        DL = drive number (80h = first, 81h = second hard disk)
Return: CF set on error
        CF clear if successful
        AH = status (see AH=01h)
SeeAlso: AH=02h,AH=0Ah