Life Recorder
Bruce Schneier writes "In 2006, writing about future threats on privacy, I described a life recorder: A 'life recorder' you can wear on your lapel that constantly records is still a few generations off: 200 gigabytes/year for audio and 700 gigabytes/year for video. It'll be sold as a security device, so that no one can attack you without being recorded."
A little pricey, but you can already buy such a thing: http://wearcam.org/domewear/
If this is the case then why is storage relevant? It's the bandwidth necessary to get the data out; doing it reliably is necessary too. An attacker could theoretically just jam the frequencies that the recorder/transmitter uses, and then attack you, steal or destroy the device, and no one would be the wiser. As a security measure, this needs to be better thought out.
On top of that, what does Bruce Schneier need with protections from attack? I hear that behind his beard lives an inordinately large prime number of fists.