a question about usb memory

[MICHAEL WEAVER]

I have a question about USB memory.
The question is why does my USB memory stick show up in the graphical 
desktop, be listed when I type ls in the command line yet not be 
accessed under the command line?
I ask this because when I plug my USB memory stick into my laptop port, 
it clearly recognises it as a Disgo and I can find it when I look 
through the folders on the Gnome desktop, when I enter a text terminal, 
type cd /media, hit enter and do ls it comes up with cdrom and disgo for 
the directories yet I can't do a cd /disgo as I get a "no such file or 
directory" or command not found.