I have been having a similar issue. What i am trying to do is copy files from my HDD to a USB flash drive. even if i change the permissions on the flash drive to 777 when i attempt to copy/paste or drag/drop from my HDD to the flash drive i recieve an error similar to " You cannot copy files to a directory that you do not have write permissions to" ( or something to that effect).

What is the linux command to mount a drive with write permissions?

Thanks in advance,
D