So you just inserted your USB stick/drive into your Linux Workstation/D3esktop/Laptop and it did not automatically mount it. What to do? Well the first thing to do would be to make sure it is not really mounted but running, you guessed it right the “mount” command.
bab@mini:~$ mount
/dev/sda1 on / type ext3 (rw,errors=remount-ro)
tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
procbususb on /proc/bus/usb type usbfs (rw)
udev on /dev type tmpfs (rw,mode=0755)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
Aha yup, looks like there are no usb