by Lyle Smith

Seagate IronWolf Pro 14TB NAS HDD Review

Data requirements continue to explode and there's no sign of it slowing down, and as such, companies that need always on, always accessible 24×7 performance continue to look for cost-effective and scalable solutions in hard disk drives, particularly smaller businesses. Seagate looks to address these issues with the most recent model of their SMB/SME enterprise line of HDDs, the IronWolf Pro 14TB, designed as a scalable solution for any NAS environment. This massive capacity gives organizations a viable option to better manage their storage server budgets. We've also reviewed the IronWolf 14TB non-Pro version.

The new 14TB model is the market's largest to date, and is designed to meet the demand of high workload environments such as Cloud-based and NAS storage, backup and disaster recovery, multi-media server and storage and file and print server sharing. Seagate also quotes a sustained transfer rate of 250MB/s.

Along with its 1.2M hours MTBF and 5-year limited warranty, the new IronWolf 14TB comes with 2 years of Seagate Rescue, the company's data recovery service. Touting a 95% success rate, this rescue plan offers protection from unexpected data loss due to accidents or mechanical damage, giving users access to a global team of world-class data recovery claiming in 15 days or less. 

Seagate IronWolf Pro 14TB Specifications

Standard Model Number ST14000NE0008
Interface SATA 6Gb/s
Drive Bays Supported Up to 24-bay
Multi-User Technology (TB/yr) 300
Rotational Vibration (RV) Sensors Yes
Hot-Plug Support Yes
Cache (MB) 256
Mean Time Between Failures (MTBF, hours) 1,200,000
Reliability Rating @ Full 24×7 Operation (AFR) 0.73%
Nonrecoverable Read Errors per Bits Read, Max 1 per 10E15
Power-On Hours per Year (24×7) 8760
Sector Size (Bytes per Logical Sector)  512E
Rescue Services Yes
Limited Warranty (years) Yes

Spindle Speed (RPM): 7200

Interface Access Speed (Gb/s): 6.0, 3.0, 1.5

Max. Sustained Transfer Rate OD (MB/s): 250MB/s

Average Latency (ms): 4.16

Rotational Vibration @ 10-1500 Hz (rad/s2)  12.5
Power Consumption

Startup Current, Typical (12V, A): 2.0

Idle Power, Average (W): 5.3

Average Operating Power (W): 7.9W

Standby Mode (W): 0.8

Sleep Mode (W): 0.8

Power Supply Requirements: +12 V and +5 V


Operating (ambient, min °C): 5

Operating (drive case, max °C): 60

Nonoperating (ambient, min °C): -40

Nonoperating (ambient, max °C): 70


Vibration, Nonoperating: 10Hz to 500Hz (Grms): 2.27

Idle (typical): 1.8bels

Seek (typical): 2.8bels



Shock, Operating 2ms (Read/Write) (Gs): 70/40Gs

Shock, Nonoperating, 1ms and 2ms (Gs): 250


Enterprise Synthetic Workload Analysis

Our enterprise hard drive benchmark process preconditions each drive-set into steady-state with the same workload the device will be tested with under a heavy load of 16 threads, with an outstanding queue of 16 per thread. The device is then tested in set intervals in multiple thread/queue depth profiles to show performance under light and heavy usage. Since hard drives reach their rated performance level very quickly, we only graph out the main sections of each test.

Preconditioning and Primary Steady-State Tests:

  • Throughput (Read+Write IOPS Aggregate)
  • Average Latency (Read+Write Latency Averaged Together)
  • Max Latency (Peak Read or Write Latency)
  • Latency Standard Deviation (Read+Write Standard Deviation Averaged Together)

Our Enterprise Synthetic Workload Analysis includes four profiles based on real-world tasks. These profiles have been developed to make it easier to compare to our past benchmarks, as well as widely-published values such as max 4K read and write speed and 8K 70/30, which is commonly used for enterprise drives.

  • 4K
    • 100% Read or 100% Write
    • 100% 4K
  • 8K 70/30
    • 70% Read, 30% Write
    • 100% 8K
  • 128K (Sequential)
    • 100% Read or 100% Write
    • 100% 128K

In the following section of this review, we will show the 14TB Seagate IronWol Pro’s performance in both iSCSI and CIFS configurations compared to the 12TB and 12TB Pro models as well as the 14TB non-Pro model. Seagate supplied StorageReview with 8 samples of their new NAS HDDs, which we configured in RAID6. All the drives were tested in our NETGEAR ReadyNas 628X.

In our throughput test measuring 4K random performance the Seagate IronWolf Pro 14TB placed second in iSCSI read performance with 674 IOPS read (just behind the non-pro version) and first in writes with 1,245 IOPS write. For CIFS the Pro drive showed 1,105 IOPS write and 330 IOPS read.

In 4k average latency, the IronWolf Pro 14TB hit 379.36ms read and 207.70ms write in iSCSI connectivity, demonstrating a significant improvement over the 12TB versions in write performance. Looking at CIFS shows a slight lead in read with 773.58ms, while writes again showed a noticeable improvement with 231.46ms.

Looking at max 4k latency we see the IronWolf Pro had read speeds with 2,452.3ms in iSCSI and 4,180.1ms in CIFS. Write performance was overall better with 5,882.9ms iSCSI and 3,971.7ms CIFS.

With standard deviation, the IronWolf Pro 14TB was the top performer in reads with 351.5ms, though writes hit a leading 488.5ms in iSCSI. The 14TB Pro in CIFS read measured 689.4ms and write measured 414.7ms.

The next benchmark tests the drives under 100% read/write activity, but this time at 8k sequential throughput. The Seagate IronWolf Pro 14TB Pro was significantly outperformed by the non-Pro model in iSCSI reads with 118,522 IOPS. It posted a much closer 50,652 IOPS write.

Our next test shifts focus from a pure 8k sequential 100% read/write scenario to a mixed 8k 70/30 workload, where we will show how performance scales in a setting from 2T/2Q up to 16T/16Q. The IronWolf 14TB drive showed similar performance in iSCSI throughout the test, though it fell off at the very end with 626 IOPS in the terminal queue depths of iSCSI.

The 8k 70/30 average latency charts told a similar story, posting a iSCSI latency range of 8.47ms to 407.96. The 14TB Pro showed the best write performance, however, with a range of 19.9ms through 1,281.29ms in the terminal queue depths.

In maximum latency, the 14TB Pro showed a range of 804.49ms to 7,785.46ms and 543.13ms and 3,634.87ms for iSCSI and CIFS, respectively (the latter which took top spot again).

Standard deviation for 8k 70/30 showed the 14TB Pro with 19.3ms to 658.46ms in iSCSI, while CIFS recorded a solid 23.54ms to 470.66ms.

Our last test is the 128k benchmark, which is a large-block sequential test that shows the highest sequential transfer speed. Here, the Seagate IronWolf Pro 14TB fell behind the lower capacity model in CIFS read performance, posting 2GB/s vs. the 12TB's 2.31GB/s. In write, the 14TB model showed a leading 1.3GB/s. In iSCSI, the 14TB IronWolf Pro hit 1.8GB/s read and 1.08GB/s write, again lagging behind the older, smaller model.


Overall, the new 14TB Seagate IronWolf Pro model is a solid option for growing small businesses that rely on NAS devices to store and manage their data. Seagate's new massive capacity point also allows organizations to accomplish this in a very cost-effective manner, including minimizing the need for drive replacements and promoting a smaller footprint in the office. Additionally, the 14TB Pro is bundled with AgileArray technology to promote availability, reliability, and RAID and power usage optimization. As was the case for the 12TB version, the IronWolf 14TB Pro offers a few benefits over the non-Pro model, including an extended warranty (3-year vs. the Pro's 5-year), support for additional drive bays, better mean times between failures and more optimization functionality for multi-users.

To gauge its performance, we tested 8 IronWolf Pro 14TB drives in a NETGEAR 628x NAS, which is the same configuration as the previous 12TB model review. Though the 14TB IronWolf setup was at the top of the charts in several categories, the non-Pro versions (as well as the lower capacity models) came out on top in some of the tests. In our 4k benchmarks the 14TB Pro was able to hit iSCSI throughputs of 674 IOPS read and 1,245 IOPS write (a 3.5% and 64% increase, respectively, over the 12TB model) and an average latency of 379.36ms read and 207.70ms write (an improvement of 3.4% and 67%, respectively over the 12TB model). In our 8k 100% Read/Write test, the 14TB Pro model was outperformed by the non-Pro model by a large margin in iSCSI reads, posting 118,522 IOPS vs the non-Pro's leading 173,277 IOPS. However, it posted a much closer 50,652 IOPS write. Lastly in our 128k large block sequential benchmark, the 14TB Pro model lagged behind the lower capacity Pro model in CIFS read performance with 2GB/s vs. the 12TB's 2.31GB/s. In write, however, the 14TB model showed a leading 1.3GB/s. In iSCSI, it hit 1.8GB/s read and 1.08GB/s write.

The Seagate IronWolf Pro NAS HDDs gives SMBs the performance they need our of a hard drives while allowing them to pack more density in the same footprint. 

Seagate IronWolf Pro 14TB on Amazon

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