[arch-general] Fwd: Notebook freeze and slow when copy big files to external usb

Hi, I when I make a copy of a large file to a 2GB or 8GB usb 3.0 external hard drive, I notice that arch remains slow, frozen ... He struggles to open windows are minimized. I have the kernel: 3.12.2-1-ARCH Update the whole system to the last. Can you think because it can be? I also went from the 3.11 kernel However, debian, ubuntu, opensuse me not pass this ... It's happened to someone else? Thanks for everything.