This call wraps up some functionality of blkid so you can get the Linux VFS driver for a mounted filesystem. For example: $ guestfish --ro -a /dev/vg_trick/Win2003x32 -m /dev/sda1 \ blkid_type /dev/sda1 ntfs Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://et.redhat.com/~rjones/libguestfs/ See what it can do: http://et.redhat.com/~rjones/libguestfs/recipes.html