Neither HDDs nor SSDs are universally more reliable. A matched Backblaze comparison found no statistically clear reliability winner between the two types in its data-center boot-drive cohort. For your own device, workload and model matter, but neither drive type removes the need for a separate, restorable backup.
Are SSDs more reliable than HDDs?
Not as a blanket rule. In a 2021 analysis, Backblaze compared HDD and SSD boot drives serving the same role and operating in the same environment. After accounting for average age and drive-days, the observed failure rates were within each other’s 95% confidence intervals. That means the study did not establish a clear winner for that matched group; it does not prove that every SSD and HDD, or every consumer workload, has the same reliability.
Backblaze’s field data comes from drives in its storage data centers, not a controlled trial of retail drives used at home. Its current reliability page reports a 1.73% quarterly annualized failure rate for Q2 2026, based on 31,553,350 drive-days and 1,498 failures; a 1.36% annualized rate for 2025, based on 115,638,676 drive-days and 4,317 failures; and a 1.41% lifetime annualized rate through Q2 2026. These are fleet-level figures, not predictions for a particular model or an individual drive. See Backblaze’s drive reliability data and methodology.
For a purchase, weigh reliability alongside workload, performance, capacity, cost, power use, form factor, and the device’s operating conditions. Backblaze’s 2021 comparison itself concluded that reliability alone did not justify the SSD’s additional cost in its specific matched cohort; that historical finding is not current model-by-model buying advice. Its SSD and HDD comparison explains the study’s limits and comparison factors.
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How HDDs and SSDs fail differently
HDDs: moving parts and physical stress
A hard disk drive stores data on spinning platters and uses read/write heads positioned with very tight tolerances. Because it is electromechanical, physical shock can be a relevant failure risk, particularly while the drive is operating. That does not mean every HDD is unusually fragile during normal use, and handling, vibration, temperature, and enclosure conditions all matter. Western Digital discusses HDD structure and shock as a risk factor in its SSD endurance and HDD workloads paper.
SSDs: flash wear and controller or electrical faults
SSDs use flash memory and controller electronics rather than spinning platters. NAND flash has finite program/erase endurance, so manufacturers commonly specify how much data can be written over a rated period or lifetime. That endurance rating is not the same thing as the probability of an electrical failure, often represented by MTBF or AFR. Western Digital notes that a drive can continue operating after reaching its endurance rating while read errors rise; a drive at its rated endurance should no longer be trusted with important data.
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Neither construction makes a drive immune to sudden failure. An SSD can stop working because of a controller or electrical problem, while an HDD can fail for reasons beyond physical shock. Choose based on the exact workload and product specifications rather than assuming one technology cannot fail.
How long does an HDD or SSD last?
There is no dependable number of years that applies to every drive. A failure-rate statistic describes a population over a defined period; it cannot tell you when one particular device will fail. Annualized failure rate (AFR) is a population measure calculated from failures and drive-days, while lifespan estimates describe how long drives in a group lasted under particular assumptions. They are not interchangeable.
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Backblaze’s 2021 HDD lifespan analysis estimated a fleet-based median of six years and nine months. Median means the age at which half the drives in the studied population had failed. Backblaze had to extrapolate beyond six years because the remaining data was too limited and concentrated in a few models to support a confident estimate. The estimate is therefore not a service-life promise for a consumer hard drive, much less an SSD. Read the full explanation of the lifespan estimate and its assumptions.
For an SSD, check the manufacturer’s endurance rating and compare it with the amount of data your workload writes. A write-endurance figure describes rated flash wear, not a guaranteed lifespan or a forecast of all possible failures. A lightly written SSD and a write-heavy working drive face different endurance demands, but either may fail for other reasons.
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Does an SSD’s TBW rating mean it will fail?
No. TBW (terabytes written) is an endurance rating: the amount of data written under the manufacturer’s specified rating before the drive reaches its rated write endurance. It is not a countdown to a predictable failure, nor does it tell you the drive’s electrical failure probability. A drive may keep operating beyond its endurance rating, but Western Digital cautions that read errors can increase and that a drive at its rating should not be trusted with important data.
For a write-intensive workload, compare the exact SSD’s manufacturer rating with your expected writes and the product’s stated conditions. Do not treat TBW as a substitute for backup or as a reason to wait for a drive to show symptoms before replacing it.
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Can SMART predict drive failure?
SMART (Self-Monitoring, Analysis, and Reporting Technology) exposes drive-reported indicators that can help identify some developing problems. A warning deserves attention, but a clean SMART report cannot rule out imminent failure. Attributes vary by model and vendor, and their meanings are not always consistent or fully documented.
In its 2021 SSD/HDD analysis, Backblaze said it recorded daily SMART values, but SSDs differed in which attributes they reported and several attribute meanings were unknown. Its SSD failure sample was limited; in that report, the SSDs it observed failed reactively rather than being predicted in advance. Use SMART as one monitoring aid—not as a guarantee or replacement for backups.
What to do when a drive fails and data recovery matters
Recovery depends on whether the damage is physical or logical, the specific device, and what happens after the problem appears. It is never assured. If files are irreplaceable, stop using the affected device rather than repeatedly troubleshooting it or attempting recovery software.
- Stop writes and shut down if the drive is distressed. Seagate Recovery Services says to “Cease using the hard drive or storage device that requires recovery.” Its guidance also advises shutting down a device with unusual noises or obvious distress and not powering it up again. This is manufacturer guidance, not a diagnosis of a particular drive.
- Do not open an HDD. Seagate warns that hard drives are sensitive to contamination and should be opened only in a clean environment. Avoid repeated power-on attempts when physical damage is suspected.
- Contact a qualified recovery provider for valuable data. Seagate’s process includes checking eligibility, submitting a claim, shipping an approved device to a lab, and receiving successfully recovered files on encrypted external storage. Its FAQ gives a typical turnaround estimate of 30 days from receipt, but actual timing varies with damage, regulations, parts, and shipping; recovery is not guaranteed. Check the current Seagate recovery service details for eligibility and terms.
- Check warranty and recovery eligibility separately. Seagate’s lookup recognizes Seagate and LaCie serial numbers, and its warranty FAQ says required data recovery must happen before an RMA. Policies, availability, costs, and eligibility depend on product and location; confirm them with the provider. See Seagate’s warranty and return FAQs.
How to protect files regardless of drive type
Keep another copy of important files on a separate device or in another location, and periodically verify that you can restore it. Moving files from a computer to one external drive is not enough if that move leaves only one copy. SanDisk states: “Moving data from the computer to an external drive IS NOT a backup unless there is a second copy of the file in a different place.” Its backup and recovery guidance explains this distinction.
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Quick Recap
- Keep a second copy that is independent of the drive holding the working files.
- Separate copies by device or location so one failure or incident does not remove all copies.
- Test restores periodically; a copy that cannot be recovered is not a dependable backup.
- Use SMART warnings and unusual behavior as reasons to protect data promptly, not as a substitute for an existing backup plan.
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