Eccolo:
`\documentclass[a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage{ucs}
\usepackage[utf8x]{inputenc}
\usepackage[italian]{babel}
\usepackage{graphicx}
\usepackage{framed}
\usepackage[dvipsnames]{xcolor}
\usepackage{tikz}
\usepackage{tikz-qtree}
\begin{document}
\begin{tikzpicture}[sibling distance=15pt]
\begin{sffamily}
\tikzset{grow'=right,level distance=80pt}
\tikzset{every tree node/.style={text width=4em,text centered}}
%\tikzset{execute at begin node=\strut}
%\tikzset{every tree node/.style={anchor=base west}}
\Tree [.HDA [./boot ]
[.Volume\\{ }Group\\{ }SISTEMA /root [./home ]
[.SWAP ] ] ]
\end{sffamily}
\end{tikzpicture}
\begin{tikzpicture}
\begin{sffamily}
\tikzset{grow'=right,level distance=50pt}
\tikzset{every tree node/.style={text width=2em,text centered}}
\tikzset{execute at begin node=\strut}
\tikzset{every tree node/.style={anchor=base west}}
\Tree [.HDB [./bootbackup\\{ }(sarà\\{ }la\\{ }copia\\{ }della\\{ }boot) ]
[./backupLVM\\{ }(verrà\\{ }aggiunto\\{ }dopo\\{ }l'installazione
] ]
\end{sffamily}
\end{tikzpicture}
\end{document}`
M.