Seagate vs. Western Digital vs. Toshiba vs. HGST: Which Hard Drive Brand Is Most Reliable?

When buying a hard drive, most people compare storage capacity, price, and read/write speeds. But if you’re storing family photos, important documents, business files, or system backups, there’s another factor you shouldn’t overlook: long-term reliability.

Hard disk drives (HDDs) can fail regardless of their brand, and losing important data can be far more expensive than replacing the drive itself. However, do some manufacturers produce more reliable hard drives than others?

A research paper published in IEEE Transactions on Cloud Computing offers some compelling evidence. Researchers Christoph Siemroth of the University of Essex and Yeomyung Park of Sungkyunkwan University analyzed more than 443,000 hard drives monitored by cloud storage provider Backblaze between 2013 and the second quarter of 2025. Their analysis compared HGST, Western Digital, Seagate, and Toshiba while accounting for several factors that influence drive failure rates.

The results reveal substantial differences between manufacturers. HGST and Western Digital recorded lower estimated failure rates than Seagate, while Toshiba’s rate was slightly higher than Seagate’s under comparable conditions.

But the research also highlights something important: the most reliable hard drive brand isn’t necessarily the one you should buy today. Individual drive models, operating temperatures, workloads, and the age of the hardware all matter.

Here’s what the study found and what it means when choosing a hard drive for your PC, NAS, or backup system.

More Than 443,000 Hard Drives Analyzed

The researchers used Backblaze’s extensive drive reliability dataset, which contains years of operational information from hard drives deployed in the company’s data centers.

Backblaze has publicly released HDD statistics since 2013, making its data a valuable resource for studying storage reliability at scale.

For this research, the authors examined 443,156 drives from four manufacturers:

• HGST: Hitachi Global Storage Technologies, now part of Western Digital.
• Western Digital (WD): A major hard drive manufacturer serving consumer and enterprise markets.
• Seagate: A leading HDD manufacturer with products ranging from desktop drives to enterprise storage.
• Toshiba: A manufacturer of consumer, NAS, and enterprise hard drives.

The dataset covered operations from 2013 through June 2025 and represented more than 1.66 million drive-years of operation. The main statistical regression used 442,992 drives.

Rather than simply counting failed drives, the researchers used survival-analysis techniques to compare failure risks while accounting for differences between the drives.

Their model considered four primary variables:

• Drive age: How long a hard drive had been operating.
• Storage capacity: The drive’s total capacity in terabytes.
• Form factor: The physical size and type of drive.
• Operating temperature: The drive’s average temperature during operation.

These adjustments matter because manufacturers don’t necessarily have identical drive populations in a data center.

For example, one brand might have a large number of older drives, while another has recently deployed higher-capacity models. Comparing their raw failure counts without considering those differences could produce misleading conclusions.

The researchers also accounted for drives removed from service without a recorded failure, a situation known as right-censoring in survival analysis.

Approximately 146,943 drives, or 31% of the sample, left Backblaze’s fleet without a recorded failure. Rather than automatically treating these drives as failures or ignoring their operating history, the statistical approach incorporated the time they had survived.

HGST and Western Digital Recorded the Lowest Estimated Failure Rates

The most notable finding was the difference in estimated failure rates between manufacturers after adjusting for drive age, capacity, form factor, and temperature.

The researchers used Seagate as the baseline for their comparison. Its relative failure rate was set to 100%.

Source: Siemroth and Park, Are There Manufacturer Differences in Hard-Drive Reliability? These are adjusted relative estimates, not absolute annual failure percentages.

HGST recorded the lowest estimated failure rate in the analysis, at approximately 41% of Seagate’s rate under comparable conditions.

Western Digital came next, with an estimated rate of approximately 52% of Seagate’s.

Toshiba’s estimated failure rate was about 7% higher than Seagate’s.

These figures describe relative statistical risks within the study’s dataset. They do not mean that 41% of HGST drives failed or that 52% of Western Digital drives developed problems. Nor do they predict the exact probability that a specific drive will fail during a particular year.

The results also shouldn’t be interpreted as a universal ranking of every HDD model. A particular Seagate model could outperform a specific Western Digital or Toshiba model, depending on its design, age, workload, and operating environment.

Nevertheless, the study suggests that manufacturer-level differences remain measurable even after several important factors are taken into account.

Why HGST’s Results Are Particularly Interesting

HGST is an unusual entry in this comparison because it is no longer an independent major HDD brand in the same way as Seagate or Toshiba.

Western Digital acquired Hitachi Global Storage Technologies in 2012. The HGST name subsequently became part of Western Digital’s storage business, and HGST-branded products largely disappeared from the new-drive market.

The researchers still treated HGST as a separate category because the historical Backblaze dataset contains a substantial number of HGST drives.

This distinction is important when interpreting the findings.

HGST’s strong results reflect the performance of the drives represented in the historical dataset, not a guarantee that a newly purchased Western Digital drive will behave exactly like an older HGST model.

The researchers also found that HGST and Western Digital performed relatively closely in their adjusted comparisons. Shared technology following the acquisition may help explain that similarity, although the study does not establish a single cause.

For buyers shopping in 2026, the practical takeaway is to focus on currently available Western Digital models rather than treating HGST as a separate new-drive purchasing option.

Toshiba Hard Drives Showed a Sharp Increase in Failures With Age

One of the study’s most interesting findings concerns how failure rates change as hard drives get older.

The four manufacturers did not follow identical patterns throughout the observed operating period.

Toshiba showed a particularly pronounced increase in failures after approximately five years of operation.

According to the researchers, Toshiba’s monthly failure rate increased more than fourfold after around 60 months. Between 50 and 100 months of service, Toshiba drives experienced approximately five to six failures per 1,000 drives per month in the study’s estimates.

By comparison, the other three manufacturers generally remained at or below approximately 2.5 failures per 1,000 drives per month over the same period.

This suggests that drive age can influence manufacturers differently, making it important to consider more than a single overall failure-rate figure.

However, the results do not mean every Toshiba hard drive will fail after five years. Some drives can continue operating for considerably longer, while others from any manufacturer can fail much earlier.

The figures describe the trend observed across the available data, not the fate of an individual drive.

Why Drive Age Matters When Buying an HDD

Mechanical hard drives contain moving components, including spinning platters and read/write heads. Over time, components can wear, and drives may become more susceptible to faults.

For home users, a five-year-old drive that still works perfectly isn’t necessarily due for immediate replacement. However, its age is a good reason to check its health, verify that backups are current, and consider whether the data it stores needs additional protection.

For businesses and data-center operators, the results may also help inform hardware refresh schedules.

The main lesson is simple: don’t rely on a drive’s brand alone when assessing the risk associated with older storage hardware.

Be Careful When Interpreting Failure Rates for Drives Older Than 10 Years

Although the research covered more than a decade of operational history, its evidence becomes less substantial at the oldest ages.

Only approximately 0.52% of the drives analyzed had been tracked for more than 10 years.

That means the dataset contained far fewer observations for drives operating beyond a decade than for newer and middle-aged hardware.

Consequently, the study provides stronger evidence about short- and medium-term reliability than about the likelihood of a drive surviving 10, 12, or 15 years.

This distinction matters because many people continue using older HDDs for backups, archival storage, and secondary drives long after their original warranty expires.

A drive that has worked reliably for years may continue doing so, but its past performance doesn’t guarantee future reliability.

If you have important files on an aging hard drive, maintain another copy on a separate device or storage service rather than assuming the drive will keep working indefinitely.

Higher Hard Drive Temperatures Are Linked to More Failures

Temperature was another important factor in the researchers’ analysis.

The study found that each additional 1°C in average operating temperature was associated with an approximately 2.1% increase in the estimated failure rate. A 10°C increase corresponded to an increase of roughly 23%.

These percentages describe a statistical relationship, not a guarantee that cooling a particular drive will produce exactly the same reduction in failures.

Even so, the finding highlights the importance of keeping hard drives within their recommended operating temperatures.

How Much Difference Can Temperature Make?

Consider a hypothetical drive with an estimated failure rate of 2% at an average operating temperature of 40°C.

Using the relationship reported in the study, lowering the average temperature to 30°C would correspond to an estimated failure rate of approximately 1.63%.

That is a relative reduction of about 18.5% in this example, rather than a reduction of 10 percentage points.

The calculation illustrates why temperature can matter over extended operating periods. However, it should not be used as an individual drive failure prediction.

How to Keep Your Hard Drive Cool

If you use HDDs in a desktop PC, NAS, or home server, a few basic precautions can help manage temperatures:

• Maintain good airflow: Make sure air can circulate through the case or drive enclosure.
• Avoid overcrowding: Multiple drives packed closely together can restrict airflow and retain heat.
• Monitor drive temperatures: Use a suitable SMART monitoring tool to check reported temperatures.
• Clean dust filters and fans: Dust buildup can reduce cooling efficiency.
• Follow the manufacturer’s specifications: Keep the drive within its recommended operating range.

In the Backblaze dataset, approximately 90% of drives had average operating temperatures ranging from about 22.5°C to slightly above 40°C. The findings are therefore relevant to ordinary data-center operating conditions, not just extreme heat.

For home users, the goal isn’t to make a drive as cold as possible. It’s to maintain stable, appropriate temperatures and avoid unnecessary heat.

Are Higher-Capacity Hard Drives More Reliable?

You might assume that a high-capacity HDD is less reliable because it stores more data and may contain more platters or more complex internal hardware.

Interestingly, the study identified the opposite association.

After accounting for the other variables in its model, each additional terabyte of capacity was associated with an approximately 3.4% reduction in the estimated failure rate.

This doesn’t mean a 20TB drive is automatically 68% more reliable than a 1TB drive. The relationship is statistical, and its interpretation depends on the model and the types of drives represented in the dataset.

Still, the results suggest that higher-capacity drives in the analyzed fleet tended to have lower failure rates.

Why Might Larger HDDs Be More Reliable?

The researchers discuss several possible explanations for this relationship.

1. Newer drive technology

Higher-capacity models are often newer generations of hardware. Improvements in manufacturing processes, firmware, recording technology, and mechanical design may contribute to better reliability.

2. Helium-filled drive designs

Some high-capacity enterprise HDDs use helium instead of air inside the enclosure. Because helium is less dense than air, it reduces aerodynamic resistance around the spinning platters, potentially helping manufacturers design drives with different mechanical and thermal characteristics.

3. Differences in deployment

High-capacity drives are common in modern enterprise storage systems. Their performance may therefore reflect newer hardware generations and deployment practices rather than storage capacity alone.

These are plausible explanations, not proof that capacity itself makes a drive more reliable.

Should You Always Buy a High-Capacity HDD?

Not necessarily.

A high-capacity drive might offer better value per terabyte and show favorable reliability characteristics in a large-scale dataset, but it may still be unsuitable for your particular system.

Before buying an HDD, consider:

• Specific model: Reliability can vary considerably between models from the same manufacturer.
• Recording technology: Check whether the drive uses CMR or SMR, especially if it will handle frequent writes or NAS workloads.
• Intended workload: A desktop drive, NAS drive, and enterprise drive may be designed for different operating conditions.
• Warranty and support: Review the warranty period and the manufacturer’s terms.
• Performance: Consider rotational speed, sustained transfer rates, and workload requirements.
• Noise and power consumption: These factors can matter in a quiet home PC or always-on NAS.
• Cost per terabyte: Compare the total price with the usable capacity you actually need.
• Backup requirements: Higher capacity does not eliminate the need for redundant copies of important data.

The right choice depends on your use case, not just the number of terabytes on the label.

Why Data-Center Hard Drive Results May Not Match Consumer Experience

The study’s large sample size is a major advantage, but it also creates an important limitation: Backblaze’s drives operate primarily in enterprise storage infrastructure.

A hard drive in a data center may run continuously, handle substantial workloads, and experience different vibration, cooling, and maintenance conditions from a drive installed in a home computer.

For example, a desktop HDD used for occasional backups may spend much of its time powered off. An enterprise drive may remain active around the clock.

These differences can affect how reliability statistics translate to individual users.

The study also could not reliably compare read/write workloads across all manufacturers because the available SMART information was not consistent enough across drive models. Two drives with similar operating hours may have handled very different amounts and types of activity.

As a result, the research cannot establish that a manufacturer’s drives are inherently more reliable under every possible workload.

The best interpretation is that the adjusted differences were present in this particular large-scale data-center dataset, even after accounting for several major factors.

How the Study Differs From Backblaze’s Regular Reliability Reports

Backblaze regularly publishes its own hard drive reliability statistics, including annualized failure rates (AFR) for individual drive models and its overall fleet.

These reports are valuable, but a simple comparison of manufacturer failure rates can be misleading if their drives have different age profiles.

For example, one manufacturer may have many older drives nearing the end of their service lives, while another has recently deployed a large number of newer models.

If the older drives fail more frequently, the first manufacturer may appear less reliable even when some of the difference is related to age rather than brand.

The academic research attempted to address this problem by controlling for drive age, capacity, form factor, and operating temperature.

The authors also examined the effect of drive location within Backblaze’s infrastructure. They found that location was associated with differences in failure rates, but adding location controls did not substantially change the manufacturer comparisons.

This helps strengthen the study’s conclusions, although it does not eliminate every possible source of bias.

What Do Backblaze’s More Recent Statistics Show?

Backblaze’s separate 2025 year-end report recorded an overall annualized hard drive failure rate of 1.36% across its fleet, down from 1.55% in 2024. The report covered 344,196 drives across 30 models.

That figure represents the company’s overall fleet, not a direct confirmation of the academic study’s manufacturer ranking.

The distinction matters: the academic paper estimates adjusted differences between manufacturers across a long historical dataset, while Backblaze’s operational reports describe the drives in its fleet during specific reporting periods.

For anyone shopping for a new drive, model-specific results from recent reports can complement the historical manufacturer-level analysis.

You can explore the data directly through Backblaze’s official hard drive statistics.

Seagate vs. Western Digital vs. Toshiba vs. HGST: What Should Buyers Know?

The research provides useful evidence about the relative reliability of the four manufacturers, but the results need to be interpreted in context.

HGST: Its drives recorded the lowest adjusted failure rate in the study. However, HGST is a historical brand rather than a mainstream independent option for buying new HDDs today.

Western Digital: WD recorded the second-lowest estimated failure rate. Its results were relatively close to HGST’s, although individual model performance still matters.

Seagate: Seagate served as the baseline for the comparison. Its estimated failure rate was higher than HGST’s and Western Digital’s in the adjusted model, but the study does not show that every Seagate model is less reliable than every competing drive.

Toshiba: Toshiba’s overall adjusted failure rate was slightly higher than Seagate’s. The study also found a particularly sharp increase in the monthly failure rate for Toshiba drives after around five years of operation.

These findings can help inform a purchasing decision, but they shouldn’t replace research into the exact model you plan to buy.

A drive with a strong recent track record, suitable workload rating, appropriate warranty, and good thermal conditions may be a better choice than an older model from a manufacturer that performed well in historical data.

How to Choose a Reliable Hard Drive in 2026

If you’re buying a hard drive for important files, use the study as one part of your decision rather than treating it as a definitive buying guide.

Here are five practical steps to follow.

1. Research the Exact Model

Look for model-specific reliability data where available. A manufacturer’s overall results can hide significant differences between its product families and generations.

2. Match the Drive to Your Workload

Choose a drive designed for your intended use. A standard desktop HDD may be sufficient for general storage, while a NAS or enterprise drive may be more appropriate for particular always-on or multi-drive environments.

3. Check the Warranty and Specifications

Review the manufacturer’s warranty, workload rating, recording technology, and compatibility requirements before purchasing.

4. Monitor Drive Health

Use SMART monitoring tools to check for warning signs, such as increasing reallocated sectors or other relevant health indicators. SMART data is useful, but a drive can fail without providing an obvious warning.

5. Maintain Independent Backups

This is the most important step of all.

No HDD manufacturer can guarantee that every drive will operate without failure. Keep additional copies of irreplaceable files on separate storage devices or a suitable cloud backup service.

For particularly important information, follow the 3-2-1 backup principle: keep three copies of your data, use two different types of storage, and store one copy off-site.

A reliable drive reduces risk, but a proper backup strategy protects you when reliability isn’t enough.

Conclusion: Which Hard Drive Brand Is Most Reliable?

The analysis of more than 443,000 Backblaze hard drives suggests that HGST and Western Digital had the lowest adjusted failure rates in the historical dataset, while Seagate followed and Toshiba recorded a slightly higher overall rate than Seagate.

The researchers also identified important relationships between reliability, drive age, operating temperature, and storage capacity. Toshiba’s failure rate increased sharply after approximately five years, higher operating temperatures were associated with more failures, and higher-capacity drives tended to have lower estimated failure rates.

However, the findings aren’t a guarantee of how any particular hard drive will perform in 2026. The dataset primarily represents enterprise storage environments, and it covers multiple generations of hardware.

For consumers, the smartest approach is to compare individual drive models, match the hardware to the intended workload, maintain good cooling, and keep reliable backups of important files.

Ultimately, the best hard drive is not simply the one with the strongest historical brand statistics. It’s the drive that suits your needs, performs reliably under your operating conditions, and forms part of a backup strategy that protects your data if it fails.

Sources

1. Original Research Paper: Are There Manufacturer Differences in Hard-Drive Reliability? — IEEE Transactions on Cloud Computing
   Christoph Siemroth and Yeomyung Park’s peer-reviewed study comparing HDD failure rates across HGST, Seagate, Toshiba, and Western Digital.
2. Research Paper — Free Full Text: Are There Manufacturer Differences in Hard-Drive Reliability? — University of Essex
   Research abstract, publication details, DOI, and access to the accepted manuscript.
3. Backblaze Official HDD Statistics: Hard Drive Reliability and Test Data
   Backblaze’s publicly available hard drive reliability statistics and downloadable datasets.
4. Backblaze 2025 Year-End Report: Backblaze Drive Stats for 2025
   Annualized failure rates, individual drive model performance, and historical reliability comparisons.
5. Backblaze 2025 Report Announcement: 2025 Drive Stats Report — Backblaze Investor Relations
   Official announcement summarizing the 2025 drive statistics and overall fleet failure rate.