This is a nifty graphical explanation of how much a petabyte, which will be the size of the average hard drive in not too many years, represents in storage capacity.
An element I found interesting was the change in the price of a gigabyte of hard drive space in just the last nine years, from $228 to 88 cents. One company claims it will have a petabyte drive on the market in 2-5 years for $750, which will likely be $500 six months later and $250 a year after that. A petabyte is a million gigabytes, by the way. Makes me nostalgic for that 10-megabyte drive I thought was so big in my late-80s Mac.
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