Permission denied when copying my files into a drive

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http://askubuntu.com – It`s been my very first day of using ubuntu 12.10 version in my lappy. As a newbie in ubuntu, i am facing a problem regarding about transferring any files into my drives except the home. Wehenever i am trying to copying or moving any files then it is giving me an error which is "There was an error copying files into /media/null/403ed6ac-29d8-4f0a-b8c7-d7e822023756/name-of-my-file permission denied". Even whenever i am copying a file and then trying to pasting it in a local drive then it is not showing me the paste option on right clock too. I have three drives one is for home, other both are h (HowTos)