When you buy a NS2 and it has firmware version 1.0.2 then you can use this backdoor.
(there where some 1.2.5 which also had this backdoor but newer ones don't)
The firmwares 1.2.5 and 1.2.6 on the Lacie site don't have this backdoor anymore, read this topic http://forum.nas-central.org/viewtopic.php?p=5880#p5880
When you have updated your NS2 with one of these firmwares you have to open up your NS2 and connect your HDD to
another Linux system to edit some files to get root access.
When connected to another system mount sda9 from your Lacie HDD and go to /etc/initng/runlevel and edit the file default.runlevel
simply remove the # before sshd
Go to /etc and add the following line to your passwd file
Build your HDD back on your NAS and make a connection, user new_root with password new_root should have
root access now.
But keep in mind that every change you make on a user in the Lacie dashboard (add user/change password) will
remove your added line from passwd and you loose root access
Removing your HDD isn't very difficult and if you do it with care nobody will notice