In the section Introduction 4.2 (Preparing USB Boot Media) of the installation
guide it says that one should copy the boot image to the usb stick by calling
dd if=diskboot.img of=/dev/sda
without any words of warning about using the correct device. This should be
fixed as soon as possible as all new computers are shipped with SATA harddisks
that show up as /dev/sda. By following the advice from the guide a user could
erase a chunk of his harddisk including the partition table.
Good catch. I've removed the reference to any real device name, and somewhat
improved the advice on finding the true device name. This will make it to the
next rollout of the Installation Guide.