Estimate how much memory would be needed in order to store everything a person s

Question

Estimate how much memory would be needed in order to store everything
a person sees and hears in his or her lifetime.
Assume a person lives for 70 years, but is asleep for one third of the time.
Sound is to be recorded at stereo CD quality (Sound is stored on a CD in samples. Each sample has 32 bits (16 bits for each of 2 stereo channels) and there are 44,100 samples per second of music). Visual information is to be recorded from two cameras,
each with 1 million pixels, 3 bytes per pixel, and 30 frames per second.
Assume compression is then used to reduce the total amount of data to be
stored to 10% of its original value. Show how you worked out your answer.
What duration of recording could fit on a 500 GB solid state disk? Discuss
whether current storage technology would make it practical to record a
person’s lifetime memories.

Explanation / Answer

Space required to record audio = 2*16*44100*60*60*24*365.25*70/3 bits

= 2*16*44100*60*60*24*365.25*70/3 /1024/1024/1024/8 GB

= 120970.497 GB

Space required to record Video = 2*1000000*3*30*60*60*24*365.25*70/3 Bytes

= 2*1000000*3*30*60*60*24*365.25*70/3 /1024/1024/1024 GB

= 123439282 GB

After Compression = ( 120970.497 + 123439282 ) / 10 = 12356025.2 GB

Duration of recording that will fit in 500 GB SSD = 500/12356025.2*70 = 0.00283262614 Years = 1.03390854 Days

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