Hi Greg, Thanks for your quick reply. On Wed, Feb 03, 2016 at 07:07:45PM -0800, Greg Kroah-Hartman wrote: > > Note that I have this problem with all USB sticks, not just this one > > stick. > > What filesystem, vfat? What is the mount options you use for it? Try oops, forgot that: /dev/sdc1 on /mnt/mnt type vfat (rw,relatime,sync,uid=500,fmask=0022,dmask=0022,codepage=437,iocharset=utf8,shortname=mixed,errors=remount-ro) > turning off the 'flush' option if possible to try to match the same > Windows options. legolas:~# mount -o remount,nosync /dev/sdc1 /mnt/mnt obviously makes things much faster, but by then the copy is acked immediately (it's too fast to even measure the speed) but the usb key keeps writing in the background for a while as expected. flush option does not seem enabled. Still, you're likely on the right track, something seems to wait for each write to proceed before sending the next one. Is there another option I can try? Thanks, Marc -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Microsoft is to operating systems .... .... what McDonalds is to gourmet cooking Home page: http://marc.merlins.org/ | PGP 1024R/763BE901 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html