Comment 233 for bug 197762

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ktp (kari-petersen) wrote : Re: file transfers on USB flash key (pendrive) are slowing down with time

I'm pretty sure that comment 177 will help most of you all. This bug is probably a duplicate of #381300
See https://bugs.launchpad.net/ubuntu/+source/linux/+bug/381300 for more information.

Try to set your I/O scheduler to noop and see if transfer rates stay constant.
To do this follow these steps:

sudo gedit /boot/grub/menu.lst
search for the line begining with #kopt and add "elevator=noop" without the quotes to the end of the line
save & exit
sudo update-grub
reboot

HTH, ktp.