I have some problems to use USB memories .

Fedora recognize automatically thr USB pen  that I plug inside a USB socket:

..... I can see it as 

Bus 002 Device 003: id 0781:5575 SanDisk Corp

as result of command "lsubs".

I can also go inside it using Nautilus, and to work with the files stored 

inside it *but only if I use Nautilus*.

Instead I cannot use this pen by the terminal (using commands line).

If I execute :

ls /mnt/dir_where_is_mounted,

 I don't see the files that are inside the pen.., .. the output is not rigth ....

I thougth it necessary to mount manually the USB pen for achieve this targhet

but I didn't get success also in this way...

Can some one explain me how tho work with my USB  pen *by command line*?

We need (manually)  to mount the USB devices (memory flash, Hard Disk, ..) to achieve some purpouse ?

Regards

Thank you

Angelo