Joe:~# mount
/dev/hdb1 on / type ext3 (rw,errors=remount-ro)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
tmpfs on /dev type tmpfs (rw,size=10M,mode=0755)
usbfs on /proc/bus/usb type usbfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
Joe:~# mkdir -p /mnt/hda2
Joe:~# mount /dev/hda2 /mnt/hda2
mount: /dev/hda2 already mounted or /mnt/hda2 busy