To by IMHO neslo ani nahodou, cez ATA sa cita a zapisuje do "registrov" controllera disku, resp. "posielaju sa commandy" (zapisom do registrov disku a nakonic zapisom do command-registra), ak prerusis I/O-write tak IMHO nepojde vobec nic (ani BIOS by ten disk nezdetekoval, ptz by nebolo mozne poslat disku "identify device" command).