If you look at the Dell discussions on this, some find newer drivers help. I do not want to mislead you on which driver. Please ask Acer.
When I transfer data from my hard drive to my s2 1 terrabite samsung external hard drive the speed is only going at 25 Mb/s. I believe it shopuld be faster. i am using the usb3 port, and the file types are the same. Can my anti virus be slowing it down. I thought it could be the HDD speed (though I don't really understand it), the aspire runs at 5,400 apparently, and the extternal at 7,400, is this the problem? if so Acer should be shot for providing the usb port on an unsuitable laptop. Any help would be appreciated. By the way it took 4 hours to transfer 350 Gb