Being notified about CD/DVD media

[Davide Bolcioni]

Greetings,
I am attempting to find how to get notified about CD/DVD media 
availability in non-desktop circumstances, e.g. an operator walks to a 
server and inserts a blank DVD which then becomes a candidate for backups.

My guess is that I should look at either HAL or D-BUS, but I would like 
to hear about the pros and cons of each solution: as far as I know, HAL 
feeds D-BUS but the latter is mainly intended for desktop applications, 
so in my use case might not even be there. I could poll the device once 
a minute, but I would hate to do so.

Thank your for your consideration,
Davide Bolcioni
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