What Hard Drive Should I Buy?

At the end of 2013, we had 27,134 consumer-grade drives spinning in Backblaze Storage Pods. The breakdown by brand looks like this:

Hard Drives by Manufacturer
Brand Number
of Drives
Terabytes Average
Age in Years
Seagate 12,765 39,576 1.4
Hitachi 12,956 36,078 2.0
Western Digital 2,838 2,581 2.5
Toshiba 58 174 0.7
Samsung 18 18 3.7

via Backblaze Blog » What Hard Drive Should I Buy?.

Why do we have the drives we have? Basically, we buy the least expensive drives that will work

There are a lot of numbers tossed around in this article that are difficult to summarize.  The above table shows the data set they worked from.