| Action: | Provides a direct link into the XIOS to allow data to be written from a specified memory location to disc, starting at a specified logical disc sector. |
| On entry: | AL = Drive number (0 = A:, 1 = B: etc) CX = number of sectors to write DX = start sector relative (logical) number DS:BX = Segment offset of DTA |
| Returns: | Carry clear if successful Carry set if failed, AX = Error code, as shown for INT 25h. |
| Notes: | See INT 25h. All comments apply. |