root@OpenWrt:~# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 1.3M      1.3M         0 100% /rom
tmpfs                    30.3M    100.0K     30.2M   0% /tmp
tmpfs                   512.0K         0    512.0K   0% /dev
/dev/mtdblock4            3.8M      3.3M    500.0K  87% /overlay
mini_fo:/overlay          1.3M      1.3M         0 100% /
root@OpenWrt:~# lsusb
Bus 001 Device 002: ID 0951:1603 Kingston Technology DataTraveler 1GB/2GB Pen Drive
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
root@OpenWrt:~# cd /dev/
root@OpenWrt:/dev# ls
1-1                 mtd2ro              mtdblock1           ptmx
console             mtd3                mtdblock2           pts
cpu_dma_latency     mtd3ro              mtdblock3           random
full                mtd4                mtdblock4           shm
kmsg                mtd4ro              mtdblock5           tty
log                 mtd5                mtdblock6           ttyS0
mem                 mtd5ro              mtdblock7           urandom
mtd0                mtd6                network_latency     usb1
mtd0ro              mtd6ro              network_throughput  watchdog
mtd1                mtd7                null                zero
mtd1ro              mtd7ro              port
mtd2                mtdblock0           ppp
root@OpenWrt:/dev#