Showing posts from September, 2016

Backblaze hard disk drive failure data: Update to Q2 2016

Ross Lazarus, September 2016

This is a Kaplan Meier analysis of the BackBlaze hard drive reliability data, using all available data to end second quarter of 2016 from

Previous posts are at and

I reran my scripts and got the plots shown below. It's taking a while to read all the data as there are now a very large number of drives spinning. A total of 41740623 rows were processed in about 35 minutes on my home desktop by the python script in the github repository.

The new 8TB drives are performing the best of all - even better than the HGST and Hitachis - and way better than any of the earlier seagates. Hard to miss here - not so obvious in the report at Backblaze

Updated curves:

By Manufacturer: