Odd problem with terminal

[Karl Larsen]

     I have several USB memory sticks with some just junk on them. I use 
the proper bash calls to remove the junk but get this error message 
every time:

karl at Lucid:/media$ ls
4083-B092
karl at Lucid:/media$ sudo rm -Rf 4083-B092/
rm: cannot remove directory `4083-B092': Device or resource busy
karl at Lucid:/media$

I can't find out what the Device or resource busy error is, or where it 
is coming from. I also have a hard drive which plugs into a USB port and 
it too gives the same error message.

What can I be doing wrong?

73 Karl

-- 

	Karl F. Larsen, AKA K5DI
	Linux User
	#450462   http://counter.li.org.
         Key ID = 3951B48D