How to change permission external hard drive in ubuntu 12.04

How to change permission external hard drive in ubuntu 12.04

I want to copy any file to my external hard drive. But always when I tried
to do this I have next output:
cp: cannot create regular file /media/NameOfCard/[file]' : Read only file
system
I also tried:
sudo chmod -R 775 /media/NameOfCard
sudo chmod -R 777 /media/NameOfCard
But the same effect - ... Read only file system
Any suggestions?
How to solve this trouble and let permission to copy and delete files to
hard drive?