Average Bench: 45.9% (395th of 1015)

Based on 2,727 user benchmarks.  Models: ST3500820AS, ST350082 ST3500820AS, ST350082 0AS

Below average average bench

The Seagate ST3500820AS 500GB averaged 54.1% 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 0.6MB/s
Avg. 4K Random Write Speed 1.23MB/s

Above average consistency

The range of scores (95th - 5th percentile) for the Seagate ST3500820AS 500GB is 32.8%. This is a relatively narrow range which indicates that the Seagate ST3500820AS 500GB performs reasonably consistently under varying real world conditions.


Avg. Sequential Write Speed 41.5MB/s
Avg. Sequential Mixed IO Speed 41.8MB/s

Average Bench

(Based on 2,727 samples)
Min Avg Max
47 Read 82.7 106
11.5 Write 41.5 101
19.4 Mixed 41.8 54.2
29.4 SusWrite 77.2 106
44.7% 60.8 MB/s
Min Avg Max
0.3 4K Read 0.52 0.6
0.72 4K Write 1.23 1.8
0.3 4K Mixed 0.6 0.8
111% 0.78 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest HDD (mainstream) averages a speed of 100%
466GB free
Firmware: SD25
SusWrite @10s intervals: 104 106 106 107 108 107 MB/s
Read 108
Write 103
Mixed 52.7
SusWrite 106
68% 92.4 MB/s
4K Read 0.5
4K Write 1
4K Mixed 0.5
95% 0.67 MB/s
466GB free
Firmware: SD25
SusWrite @10s intervals: 97 98 100 99 99 99 MB/s
Read 96.5
Write 96.8
Mixed 51.5
SusWrite 98.6
63% 85.8 MB/s
4K Read 0.5
4K Write 0.9
4K Mixed 0.5
93% 0.63 MB/s
406GB free (System drive)
Firmware: SD81
SusWrite @10s intervals: 64 83 84 98 97 94 MB/s
Read 107
Write 104
Mixed 52.5
SusWrite 86.6
64% 87.3 MB/s
4K Read 0.6
4K Write 1.6
4K Mixed 0.8
144% 1 MB/s
411GB free (System drive)
Firmware: SD45
SusWrite @10s intervals: 53 40 63 80 74 86 MB/s
Read 93.5
Write 85.3
Mixed 48
SusWrite 66.1
54% 73.2 MB/s
4K Read 0.4
4K Write 0.9
4K Mixed 0.5
89% 0.6 MB/s
2,727 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 22,991,271 HDDs tested.

Typical ST3500820AS 500GB Builds (Compare 7,067 builds) See popular component choices, score breakdowns and rankings.
Gaming 43%
Speed boat
Desktop 50%
Workstation 35%
Sail boat

Motherboard: Gigabyte GA-X58A-UD3R - $210

EDIT WITH CUSTOM PC BUILDER Value: 34% - Below average Total price: $1,010

Popular ST3500820AS 500GB 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 2020 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 $218Nvidia GTX 1660S (Super) $240Crucial MX500 250GB $42
Intel Core i5-9400F $155Nvidia GTX 1650S (Super) $160Samsung 850 Evo 120GB $78
Intel Core i7-9700K $324Nvidia RTX 2060 $349Samsung 850 Pro 512GB $249
Seagate Barracuda 1TB (2016) $37Corsair Vengeance LPX DDR4 3200 C16 2x8GB $73SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $40Corsair Vengeance LPX DDR4 3000 C15 2x8GB $63SanDisk Extreme 32GB $46
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $653SanDisk Ultra Fit 32GB $16
Today's hottest deals
About  •  User Guide  •  FAQs  •  Email  •  Privacy  •  Developer Feedback