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To put it another way, that equates to approximately 79 million terabytes or enough digital storage space to be able to store 158 billion hours of digital video or 1.2 trillion hours of music.

 
The company notes that although it took 29 years to reach the 1 billion milestone, it will ship its next billion in less than five years. Also, by the time its nearest competitor reaches 1 billion drives shipped, Seagate will already be close to shipping its second billion.

 
According to Gartner Group, last year alone more than 500 million drives were shipped, compared to 1990, when slightly less than 30 million were shipped. 

 
And in terms of size, in 1979, Seagate's first product, the ST506 hard drive, could store 5 megabytes of data or the equivalent of one MP3 song. The drive weighed about five 2.2 kgs and cost about $US1,500, or $US300 per megabyte.
However, today, a typical Seagate hard drive offers a terabyte of data (or 1 million megabytes), which has enough capacity to record 32 days of high-definition video around the clock – at a cost of 1/5000th of a cent ($US0.00022) per megabyte.