Average Bench: 35.3% (595th of 1015)

Based on 8,343 user benchmarks.  Models: ST3320820AS, ST332082 ST3320820AS, ST332082 0A, ST332082 0AS

Poor average bench

The Seagate ST3320820AS 320GB averaged 64.7% 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 0.75MB/s
Avg. 4K Random Read Speed 0.61MB/s

Good consistency

The range of scores (95th - 5th percentile) for the Seagate ST3320820AS 320GB is 24%. This is a relatively narrow range which indicates that the Seagate ST3320820AS 320GB performs reasonably consistently under varying real world conditions.


Avg. Sequential Write Speed 44.1MB/s
Avg. Sequential Mixed IO Speed 38.1MB/s

Average Bench

(Based on 8,343 samples)
Min Avg Max
25.5 Read 64.4 78.5
16.1 Write 44.1 72.7
21.4 Mixed 38.1 44.3
17.9 SusWrite 58.3 77.6
37.7% 51.2 MB/s
Min Avg Max
0.3 4K Read 0.61 0.7
0.6 4K Write 1.29 1.8
0.4 4K Mixed 0.75 0.9
133% 0.88 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest HDD (mainstream) averages a speed of 100%
237GB free
Firmware: 3.AAC
SusWrite @10s intervals: 73 75 74 76 76 76 MB/s
Read 67.8
Write 38.5
Mixed 42.5
SusWrite 75
41% 56 MB/s
4K Read 0.7
4K Write 1.3
4K Mixed 0.8
142% 0.93 MB/s
55GB free
Firmware: 3.AAD
SusWrite @10s intervals: 60 61 62 62 63 63 MB/s
Read 71
Write 68.5
Mixed 42.5
SusWrite 62.1
45% 61 MB/s
4K Read 0.7
4K Write 1.1
4K Mixed 0.8
138% 0.87 MB/s
148GB free
Firmware: 3.AAE
SusWrite @10s intervals: 65 65 66 66 66 66 MB/s
Read 65
Write 34.7
Mixed 40.5
SusWrite 65.6
38% 51.4 MB/s
4K Read 0.6
4K Write 1.3
4K Mixed 0.8
138% 0.9 MB/s
25GB free
Firmware: 3.AFE
SusWrite @10s intervals: 53 54 53 54 54 54 MB/s
Read 59.3
Write 29.5
Mixed 38.5
SusWrite 53.7
34% 45.2 MB/s
4K Read 0.6
4K Write 1.2
4K Mixed 0.8
136% 0.87 MB/s
8,343 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 22,989,950 HDDs tested.


AmazonUS $19920 mins
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Typical ST3320820AS 320GB Builds (Compare 536 builds) See popular component choices, score breakdowns and rankings.
Gaming 11%
Tree trunk
Desktop 31%
Sail boat
Workstation 19%

System: Dell Inspiron 545

EDIT WITH CUSTOM PC BUILDER Value: 21% - Poor Total price: $224

Popular ST3320820AS 320GB systems:

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.

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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.
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  • - 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
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