Hi i am following the guides in order to copy automatically my mame roms into the retropie:

USB stick

(ensure that your USB is formatted to FAT32)
first create a folder called retropie on your USB stick
plug it into the pi and wait for it to finish blinking
pull the USB out and plug it into a computer
add the roms to their respective folders (in the retropie/roms folder)
plug it back into the raspberry pi
wait for it to finish blinking
refresh emulationstation by pressing F4, or choosing quit from the start menu

My problem is that i am not able to get it work, i mean, it does not start the copy. I've created this path in my usb: F:\retropie\roms\mame-mame4all because i want to copy only mame roms, what am i doing wrong? Thanks!!