thanx for the solutions,but they dont work.
had already tried su and sudo. tried changing permissions, doesnt work!
finally got the files in mail! but still would like to know of any other possible solutions(thats why im here, to learn). tried the mount technique also.
i would also like to mention that when i list the files in the pen drive,the folders appear in green(highlighted) and files appear in green.
ps: no offence taken for the comment on uid
also thanx for the prompt replies. sorry about my late reply