Comment 9 for bug 492301

Don't do it that way . The problem is 9.10 UNR has a bad usb-creator.exe. Like I wrote in https://help.ubuntu.com/community/Installation/FromUSBStick :

"Can not mount /dev/loop1 on /cow" message because usb-creator.exe is not creating a valid casper-rw file holding ext2/ext3 filesystem. Fix: After running usb-creator.exe, recreate casper-rw using cygwin tools or http://www.pendrivelinux.com/casper-rw-creator-make-a-persistent-file-from-windows/.