Uresh Vahalia's book is also nice. It campares between different Unix OS. The filesystems chapter gives insight of VFS and some Unix filesystems. http://www.amazon.com/gp/product/0131019082/103-1611585-2051061?v=glance&n=283155 regards Manish Regmi -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/