[IDEA] Boot XBian from USB

[SolGarlic]

I just installed xbian root in the 2nd partition of a 2TB WD green HDD inside a USB2.0 box, and following the same procedure as CurlyMo I got:
HDD Write: 31.6Mb/s
HDD Read: 25.2Mb/s

While with my SD (samsung class 4, 8gb) I had:
SD Write: 22.5 Mb/s
SD Read: 18.11 Mb/s

The current boot time with the HDD is over 1 minute until I see the "Videos" in XBMC (with sickbeard, transmission and nzbget also starting).

Meanwhile, the output of "df" is this:

Terminal

Filesystem 1K-blocks Used Available Use% Mounted on
rootfs 7720408 1230528 6489880 16% /
/dev/sda2 7720408 1230528 6489880 16% /
tmpfs 12356 284 12072 3% /run
tmpfs 5120 0 5120 0% /run/lock
tmpfs 10240 0 10240 0% /dev
/dev/sda2 1406530524 811816828 594713696 58% /media/usb0
/dev/sda1 1406530524 811816828 594713696 58% /media/usb0
tmpfs 24700 0 24700 0% /run/shm
/dev/mmcblk0p1 34662 11127 23535 33% /boot

Isn't there something wrong with both sda2 (my current root according to cmdline.txt) and sda1 being aparently mounted to the same spot (altough only sda1 files appear)??