Cloud storage outfit ranks hard drives on reliability; Seagate is worst

Mechanical hard drives are the go-to storage medium for mass backup chores, but do you sacrifice quality and reliability when opting for a higher capacity HDD over several lower capacity drives? That doesn't appear to be the case, according to the latest HDD reliability report by Backblaze, a popular cloud backup service.

Backblaze's report for the second quarter of 2016 represents over 250 petabytes of data stored on 68,813 operational HDDs used to store encrypted customer data in its data center. It's also the first one to provide any kind of meaningful preliminary data on how 8TB capacity HDDs fare in a data center setting.

Out of the nearly 69,000 HDDs in operation, 45 were HGST 8TB (HUH728080ALE600) drives and another 2,720 were Seagate 8TB (ST800DM002) drives. The reason its 8TB deployment is heavily weighted to Seagate is simply because of cost.

Ouch. Nearly 20% failure rate on Seagate 4TB drives.

Ouch. Nearly 20% failure rate on Seagate 4TB drives.

"For the last year or so we kept saying we were going to deploy 8TB drives in quantity. We did deploy 45 8TB HGST drives, but deploying these drives en masse did not make economic sense for us," Backblaze explains. "Over the past quarter, 8TB drives from Seagate became available at a reasonable price, so we purchased and deployed over 2,700 in Q2 with more to come in Q3."

Out of the 45 HGST 8TB HDDs deployed, just two of them failed during Backblaze's testing period, which it extrapolated to an annualized failure rate of 3.2 percent. Seagate's drives fared equally well—Backblaze observed just 4 failures out of what it calculates to 44,000 drives days for an annualized failure rate of 3.3 percent.

"Some people question the usefulness of the cumulative annualized failure rate. This is usually based on the idea that drives entering or leaving during the cumulative period skew the results because they are not there for the entire period," Backblaze says. "This is one of the reasons we compute the annualized failure rate using 'drive days'. A drive day is only recorded if the drive is present in the system. For example, if a drive is installed on July 1st and fails on August 31st, it adds 62 drive days and 1 drive failure to the overall results."

While not everyone might agree with how Backblaze calculates failure rates, as long as it's consistent, we can compare results. And when comparing results, the 8TB models look good, as the cloud backup service notes.

Backblaze is so confident in the 8TB models that it's getting rid of its HGST 2TB drives for the added storage space. The 2TB models have been "rock stars" for Backblaze with the latest report showing an annualized failure rate of just 1.6 percent.

Paul Lilly

Paul has been playing PC games and raking his knuckles on computer hardware since the Commodore 64. He does not have any tattoos, but thinks it would be cool to get one that reads LOAD"*",8,1. In his off time, he rides motorcycles and wrestles alligators (only one of those is true).

Latest in HDDs
A photo of a robotically disassembled hard disk drive
Microsoft's recyclobot uses machine learning and computer vision to open and recycle 90% of hard drive components
Hard Drive
Millions of perfectly fine HDDs are shredded each year because of 'zero risk' security policies. Spoiler alert: There's still a risk of stolen data from just a 3mm scrap
IBM100 RAMDAC
Hard drives predicted to be history after 2028
Seagate Exos 2X14 Mach.2 hard drive
Seagate agrees to pay US gov $300m for selling Huawei some hard drives
matze79's HDD Clicker.
Bring that retro hard drive clicking sound back into your life with this little device
Spider-Verse Seagates
Seagate's Into the Spider-Verse styled portable HDDs are stunning
Latest in News
The snazzy red and black HyperX Cloud Alpha wireless headphones float in a teal void. The microphone is attached to the headset.
The best wireless gaming headset is now even better in the Amazon Big Spring Sale, boasting a more than $50 discount
A chip being held up in an Intel fab
Intel is reportedly 'working to finalize commitments from Nvidia' as a foundry partner, suggesting gaming potential for the 18A node
Amazon box
Don't panic! The 'Do Not Send Voice Recordings' option Amazon just removed was only used by 0.03% of customers and they can still have it
Digital generated image of people surrounded by interactive transparent and glowing panels with data. Visualising smart technology, blockchain and artificial intelligence
Now I shall demand the cookies! Proposed new browsing agreement turns the tables and lets users dictate terms to websites
Intel CEO, Pat Gelsinger, with a 18A SRAM test wafer
Former Intel CEO, Pat Gelsinger becomes executive chairman of a 'Technology Platform Connecting the Faith Ecosystem' to work on Christian AI using DeepSeek
Assassin's Creed Shadows immersive mode - Naoe holding a tanto in her hand as two guards fall to the ground behind her.
Assassin's Creed Shadows' first hotfix addresses stability issues and a photo mode crash