Coping files to my usb stick

[hmmm16]

hello I have the lastest version of ubuntu and I was wondering why when i simply drag files from a folder into my usb stick (pdf files) when i then try to open them i says that they cannot be opened;
Thanks for any help

[spikoley]

I think Linux doesn't finish writing to the USB drive until it is unmounted. Try unmounting it and then mount it and try again.

[Rex Bouwense]

If drag and drop isn't working for you, try copy and paste. I back up all of my documents and pictures to USB flash drives. Also make sure the permissions on the files are correct before you move them because they should move with the old permissions.