dont know. coz i only see sw 9583 selling in hong kong.

but after looking at its web site - the web site of panasonic.

it seems that panasonic do not release firmware from time to time.

i.e. no support to consumer.

therfore, i have to say. better to buy other brands with continue support.

like the expensive one - pioneer, plextor, asus, philips
the less expensive one - nec, benq, liteon
or the cheapest one nu...

i find other brands do have new firmware for consumer to upgrade.

it is however, when u look at panasonic web site. u wll discover, dvd writer never be the device they concern - therefore zero support through...