DVD/cd standalone duplicators dont really burn x # of discs simulataneously?

Someone previously mentioned that these CD or DVD standalone DVD
duplicators dont really burn simultaneously.. is this true?

IE: a 9 disc unit like this: http://www.newegg.com/Product/Produc...82E16827236064


I'm assuming i can load my iso on the harddrive of the unit, then
press burn and it will burn 9 discs at once?


Can anyone confirm / deny this.. or point me to a similar model that
will in fact do this?


Thanks