Average Bench: 34.2% (622nd of 1015)

Based on 2,531 user benchmarks.  Models: ST3400620AS, ST340062 0A, ST340062 0AS, ST340062 ST3400620AS

Poor average bench

The Seagate ST3400620AS 400GB averaged 65.8% 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 0.65MB/s
Avg. 4K Random Write Speed 1.44MB/s

Very good consistency

The range of scores (95th - 5th percentile) for the Seagate ST3400620AS 400GB is just 19.5%. This is a relatively narrow range which indicates that the Seagate ST3400620AS 400GB performs reasonably consistently under varying real world conditions.


Avg. Sequential Write Speed 46.6MB/s
Avg. Sequential Mixed IO Speed 42.8MB/s

Average Bench

(Based on 2,531 samples)
Min Avg Max
37 Read 61 74
23 Write 46.6 71.7
31 Mixed 42.8 50.4
33.2 SusWrite 57.8 74.6
38.5% 52.1 MB/s
Min Avg Max
0.5 4K Read 0.63 0.7
0.8 4K Write 1.44 1.9
0.4 4K Mixed 0.65 0.9
125% 0.91 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest HDD (mainstream) averages a speed of 100%
178GB free
Firmware: 3.AAK
SusWrite @10s intervals: 62 61 62 63 63 63 MB/s
Read 64.5
Write 41.2
Mixed 45.8
SusWrite 62.4
40% 53.5 MB/s
4K Read 0.7
4K Write 1.8
4K Mixed 0.5
118% 1 MB/s
141GB free
Firmware: 3.AAE
SusWrite @10s intervals: 56 53 56 56 57 57 MB/s
Read 56.6
Write 30.6
Mixed 40.9
SusWrite 55.6
34% 45.9 MB/s
4K Read 0.6
4K Write 1
4K Mixed 0.8
132% 0.8 MB/s
136GB free
Firmware: 3.AAK
SusWrite @10s intervals: 45 44 44 44 45 45 MB/s
Read 64.5
Write 46.3
Mixed 44.5
SusWrite 44.6
37% 50 MB/s
4K Read 0.7
4K Write 1.6
4K Mixed 0.5
114% 0.93 MB/s
48GB free
Firmware: 3.AA
SusWrite @10s intervals: 51 49 49 49 49 50 MB/s
Read 56.8
Write 49.5
Mixed 42.3
SusWrite 49.5
37% 49.5 MB/s
4K Read 0.6
4K Write 1.3
4K Mixed 0.7
127% 0.87 MB/s
2,531 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 34,992,572 HDDs tested.


AmazonUS $553 years
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Typical ST3400620AS 400GB Builds (Compare 1,400 builds) See popular component choices, score breakdowns and rankings.
Gaming 2%
Tree trunk
Desktop 40%
Speed boat
Workstation 2%
Tree trunk

Motherboard: Gigabyte GA-G41M-Combo

EDIT WITH CUSTOM PC BUILDER Value: 50% - Above average Total price: $190

Popular ST3400620AS 400GB 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) January 2021 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 i5-9600K $208Nvidia RTX 3060-Ti $400Crucial MX500 250GB $47
Intel Core i5-10600K $257Nvidia RTX 3070 $500Samsung 850 Evo 120GB $78
Intel Core i5-10400F $161Nvidia GTX 1660S (Super) $240Samsung 860 Evo 250GB $40
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3200 C16 2x8GB $79SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $32Corsair Vengeance LPX DDR4 3000 C15 2x8GB $71SanDisk Extreme 32GB $28
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Ultra Fit 32GB $16
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