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Internally, this class also uses YAML to pack and unpack (serialise
and deserialise) the stored data. This is used by the MulticastServer
class to safely transmit and receive data within the UDP packets. It
could also be used to load/save the data to local storage between
program runs (ie, provide persistence of data).


=head2 DiskWatcher class

This class sets up a POE session that periodically calls the external
'blkid' program. It uses POE::Wheel::Run to do this in the background
so that the parent program does not block while waiting on the child
program to run to completion.

In some cases, blkid can hang (such as if a device has disappeared
without being cleanly unmounted or disconnected) or fail altogether
(such as the user not having sufficient rights, or the program not
being present on the system). This class handles both cases
gracefully.

=head2 MountWatcher class