Which distro are you using? Please put it in your user profile. If you are using SuSE linux, you can use the "halmount" command to automount the device in the /media directory.
If you don't know the device used, you can use "halmount --udi" to list each device and the devices udi. If the pendrive has a label, "halmount <label>" will work as well.
You can also use the mount command. See the "man mount" manpage.
Here is how an sd card is mounted on my desktop:
/dev/sdf1 on /media/disk type vfat (rw,nosuid,nodev,noatime,flush,uid=1000,utf8,shortname=lower)
I could have manually mounted it for example:
sudo mkdir /mnt/disk
sudo mount -t vfat /dev/sdf1 /mnt/disk -o rw,nosuid,nodev,noatime,flush,uid=jschiwal,utf8,shortname=lower
The uid option is needed for a fat32 formatted pendrive to change the ownership. This gives me permission to read and write to the drive. The "nosuid,nodev" options are standard for non linux filesystems or globally writable partition. They can prevent accidentally running malware that someone put on the pendrive.
The noatime option extends the life of the device. Pen drives have a limited number of write cycles. So you don't want the access times updated after reading a file. ( plus fat32 doesn't support access times anyway )
Notice the advantage of the halmount command. I didn't need to be root to mount the device.
Are you running a very old distro, or a minimal desktop environment. Using KDE or Gnome on a recent distro, the drive should be automounted.