At the event, HGST is comparing the power consumption between a helium-filled drive and an equivalent air-filled drive side-by-side, demonstrating a reduction in power consumption for the helium-filled drive of 23 percent.

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Comparing backup and primary power solutions is like comparing rotary phones and smart phones.

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The Big Mac Index uses Purchasing Power Parity (PPP) in comparing the price of the ubiquitous Big Mac across countries relative to its price in the USA. PPP refers to the idea that exchange rates across two countries should be equal to the relative price of a basket of goods and services in both countries.

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The right way to assess Part D is by comparing it with programs where the government is allowed to use its purchasing power.

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Comparing the coalition's performance to Fianna Fail's time in power, he said: "We knew that you couldn't just let the protagonists get on with it, the Irish government had a duty to lead".

BBC: Micheal Martin