Average Bench: 59.2% (202nd of 1015)

Based on 230 user benchmarks.  Models: ST31000521AS, ST310005 21AS, ST310005 ST31000521AS

Average average bench

The Seagate ST31000521AS 1TB averaged 40.7% lower than the peak scores attained by the group leaders. This isn't a great result which indicates that there are much faster alternatives on the comparison list.


Avg. 4K Random Mixed IO Speed 0.74MB/s
Avg. 4K Random Read Speed 0.75MB/s

Above average consistency

The range of scores (95th - 5th percentile) for the Seagate ST31000521AS 1TB is 33.3%. This is a relatively narrow range which indicates that the Seagate ST31000521AS 1TB performs reasonably consistently under varying real world conditions.


Avg. Sequential Mixed IO Speed 75.3MB/s
Avg. Sustained Write Speed 101MB/s

Average Bench

(Based on 230 samples)
Min Avg Max
68.2 Read 104 129
64.4 Write 102 130
33.7 Mixed 75.3 114
58.4 SusWrite 101 129
70.6% 95.7 MB/s
Min Avg Max
0.41 4K Read 0.75 0.92
1.25 4K Write 1.67 2.1
0.34 4K Mixed 0.74 1.1
144% 1.05 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest HDD (mainstream) averages a speed of 100%
298GB free
Firmware: CC14
SusWrite @10s intervals: 115 119 117 119 120 119 MB/s
Read 119
Write 114
Mixed 61.5
SusWrite 118
76% 103 MB/s
4K Read 0.8
4K Write 1.8
4K Mixed 1.1
189% 1.23 MB/s
194GB free
Firmware: CC14
SusWrite @10s intervals: 109 108 109 109 109 109 MB/s
Read 106
Write 102
Mixed 65.7
SusWrite 109
70% 95.9 MB/s
4K Read 0.8
4K Write 1.9
4K Mixed 1
180% 1.23 MB/s
477GB free
Firmware: CC14
SusWrite @10s intervals: 83 79 83 82 82 83 MB/s
Read 110
Write 106
Mixed 66
SusWrite 82.1
67% 90.9 MB/s
4K Read 0.8
4K Write 1.9
4K Mixed 1.1
191% 1.27 MB/s
725GB free (System drive)
Firmware: CC14
SusWrite @10s intervals: 80 82 94 101 88 88 MB/s
Read 101
Write 59.4
Mixed 60.2
SusWrite 88.7
57% 77.3 MB/s
4K Read 0.7
4K Write 1.6
4K Mixed 0.8
148% 1.03 MB/s
230 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 21,346,913 HDDs tested.

Typical ST31000521AS 1TB Builds (Compare 8,080 builds) See popular component choices, score breakdowns and rankings.
Gaming 44%
Speed boat
Desktop 51%
Workstation 40%
Jet ski

Motherboard: Asus CROSSHAIR V FORMULA-Z - $220

EDIT WITH CUSTOM PC BUILDER Value: 55% - Above average Total price: $611

Popular ST31000521AS 1TB compatible motherboards:

How Fast Is Your HDD? (Bench your build) Size up your PC in less than a minute.

Welcome to our freeware PC speed test tool. UserBenchmark will test your PC and compare the results to other users with the same components. You can quickly size up your PC, identify hardware problems and explore the best upgrades.

UserBenchmark of the month

How it works

  • - Download and run UserBenchMark.
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write, sustained write and mixed IO.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on userbenchmark.com.
  • - Identify the strongest components in your PC.
  • - See speed test results from other users.
  • - Compare your components to the current market leaders.
  • - Explore your best upgrade options with a virtual PC build.
  • - Compare your in-game FPS to other users with your hardware.
  • - Share your opinion by voting.
Hard Drive Rankings (Price vs Performance) November 2019 HDD Rankings.

We calculate effective speed which measures performance for typical consumers. Effective speed is adjusted by current cost per GB to yield value for money. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top HDDs. [HDrivePro]


Group Test Results

  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Best value for money - Value for money is based on real world performance.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.


1015 Drives (Compared) Thousands of user benchmarks compiled into one comparison list.

See how consistently different HDDs perform with varying real world conditions. The charts also illustrate overall performance, popularity and rank.

 Frequently Asked Questions

 Best User Rated

The Best.
Intel Core i5-9400F $148Nvidia GTX 1660S (Super) $230Crucial MX500 250GB $45
Intel Core i5-9600K $195AMD RX 590 $185Samsung 850 Evo 120GB $150
Intel Core i7-9700K $340Nvidia RTX 2060 $325Samsung 860 Evo 250GB $51
Seagate Barracuda 1TB (2016) $39Corsair Vengeance LPX DDR4 3000 C15 2x8GB $71SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $42G.SKILL Trident Z DDR4 3200 C14 4x16GB $609SanDisk Extreme 32GB $46
Seagate Barracuda 3TB (2016) $85Corsair Vengeance LPX DDR4 3200 C16 2x8GB $68SanDisk Extreme 16GB $24
Today's hottest deals
About  •  User Guide  •  FAQs  •  Email  •  Privacy  •  Developer Feedback