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Among the certificates issued to GCHQ is a "global" one authorising all its operations, including the trawling of up to 600m phone calls and 39m gigabytes of electronic information a day.
The Guardian revealed on Friday that GCHQ has placed more than 200 probes on transatlantic cables and is processing 600m "telephone events" a day as well as up to 39m gigabytes of internet traffic.
What might the thousands of words and images sent out by a teenager today be used for decades down the line, not to mention the gigabytes of data representing their recorded actions and preferences?
Terrorism investigations can be stupefyingly complex: thousands of gigabytes of encrypted data must be studied and plots tracked across different continents.
Back in 2010, Google admitted it had collected some 600 gigabytes of "payload data" from unsecured wireless networks in more than 30 countries.
A 2K film etched on a Blu-ray disc uses all 50 gigabytes of its two recording layers.
The same is true of the "PetaBox", another archive-developed machine that holds 1m gigabytes of data.
They have also been granted the freedom to experiment with different pricing models in other words, start charging by the megabyte instead of offering a flat rate.Under AT&T's new policy, customers using digital subscriber line (DSL) connections to the internet will have a monthly download limit of 150 gigabytes.
A typical hard disk on even a cheap computer today holds 40 to 80 gigabytes of information, which is enough for millions of e-mails, tens of thousands of photos, and hours of video.
Worldwide, data consumption is measured in exabytes (billions of gigabytes), and is growing at 78% a year.No wonder 56% of people polled by DeviceScape, a Wi-Fi software developer, say that they prefer to use Wi-Fi above 3G or 4G connections, and will proactively seek out free Wi-Fi hotspots when out and about.
Few machines had slots for more than two gigabytes.
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