“Hard Drive Cost Per Gigabyte”
    https://www.backblaze.com/blog/hard-drive-cost-per-gigabyte/
“When Backblaze purchased hard drives back in 2009, we paid over $0.11 
per gigabyte. In 2017, when we did a review of the cost of hard drives, 
the cost per gigabyte had fallen to just below $0.03 per gigabyte. 
Today, we can get 16TB hard drives for about $0.014 per gigabyte on 
average. That’s not quite a penny, but we think we’ll get there soon 
enough. In the meantime, let’s look at our hard drive purchases over the 
years and see what we can learn about the cost per gigabyte of hard 
drive storage.”
Lynn