Transmission Daemon (Torrent Web)

Hi all, i use torrent to download trought internet .. and i need to save the downloaded file's directly in an external hard disk! but when program try to save file's give me an error : "permission denied! " why?

sorry for my bad english!!!!!!!

 

Does the user has write permission on the hard disk?

Code:

sudo chown [username] /mnt/hdd
sudo chmod -R a+rwx /mnt/hdd

 

ok, i solved the problem!!

thank you