No write permission to USB drive

[kenny23]

I am trying to copy files to a USB drive and when I do it says: 'You cannot drop any items in a directory in which you do not have write permission.' When I right click in the USB folder and select properties and then the permissions tab it has 'can view and modify content' selected. Also, in advanced permissions, it has write entries selected. Can someone please shed some light on why I am unable to copy files? Thanks

[OErjan]

right click and choose change read write mode.
or
remount read write.