Changing permissions of a folder ? Well if it is an ntfs partition you might
not have the ntfs writer tool, if so then do this in the terminal :
*sudo apt-get install ntfs-3g*
Then mont and unmont the partition and try again.
It it is a Linux-friendly (ext2,3,4 etc.. partitions), you can try the *Chuck
Norris Mode* which is very extreme and might not be suitable for the long
term (so make sure to take it back to other less permissive permissions once
you've done with it), by doing this (I will take the foo.bin file as example)
:
*Defining Permission*
--> *sudo chmod 777 /media/MyMEDIA/foo.bin*
But be careful with this one and use it only in last case.
PS: It is only this file, or any other file from the partition?