You can find the model numbers used in the study here:
http://blog.backblaze.com/2014/01/21...-should-i-buy/
The drive with the highest fail rate, ST31500341AS (25.4%), is a Seagate 7200.11 drive from 2008. A six years old model using three 500GB platters. This makes me doubt there are any useful conclusions to be drawn from this drive's survivability when compared to newer 1TB per platter drives. It is clearly an outlier which you can't use to judge Seagate's reliability in general, especially that of their current drives. The second highest failure rate was on ST31500541AS (9.8%), much improved over the -341AS. But even this one is a five year old model, not exactly relevant any more. For example, ST4000DM000 is a new drive with 3.8% failure rate, similar to WD's numbers.
I don't think these results should be taken as "Seagate sucks, Hitachi rocks", one has to look at each model separately instead of blindly trusting one brand over another, and also weigh the cost of the drive and the length of its warranty against the likelihood of it failing.
Also, importantly, the study did not include many of the popular general purpose home PC drives, sorted here in order of number of reviews on newegg:
1. WD Black WD1002FAEX
2. WD Blue WD10EZEX
3-6. Smaller WD Blue drives
7. (was included) ST3000DM001
8. ST1000DM003
9. ST2000DM001
10. WD Black WD2002FAEX
Instead, mostly lower RPM drives or older 7200RPM drives were in, and results for either of those may not apply to new 7200 RPM drives. I would also love to see results for Toshiba hard drives.