Average Bench: 38.7% (532nd of 984)

Based on 963 user benchmarks.  Models: ST9640320AS, ST964032 0AS, ST964032 ST9640320AS

Poor average bench

The Seagate ST9640320AS 640GB averaged 61.2% 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 0.31MB/s
Avg. Sequential Read Speed 69.1MB/s

Very good consistency

The range of scores (95th - 5th percentile) for the Seagate ST9640320AS 640GB is just 18.1%. This is a relatively narrow range which indicates that the Seagate ST9640320AS 640GB performs reasonably consistently under varying real world conditions.


Avg. 4K Random Read Speed 0.36MB/s
Avg. 4K Random Write Speed 0.83MB/s

Average Bench

(Based on 963 samples)
Min Avg Max
49.1 Read 69.1 83.4
46.9 Write 65.9 80.7
18.6 Mixed 58 77.6
48.3% 64.4 MB/s
Min Avg Max
0.11 4K Read 0.36 0.51
0.57 4K Write 0.83 1
0.14 4K Mixed 0.31 0.42
64.7% 0.5 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest HDD (mainstream) averages a speed of 100%
595GB free
Firmware: 0002SDM1 Max speed: SATA 2.0 300 MB/s
Read 86.3
Write 82.4
Mixed 69.4
59% 79.4 MB/s
4K Read 0.5
4K Write 0.8
4K Mixed 0.42
83% 0.57 MB/s
487GB free
Firmware: 0002HPM1 Max speed: SATA 2.0 300 MB/s
Read 76.8
Write 75
Mixed 23.1
42% 58.3 MB/s
4K Read 0.33
4K Write 0.94
4K Mixed 0.4
76% 0.56 MB/s
471GB free
Firmware: 0001DEM1 Max speed: SATA 2.0 300 MB/s
Read 79
Write 71.9
Mixed 77.6
58% 76.2 MB/s
4K Read 0.5
4K Write 0.81
4K Mixed 0.42
83% 0.58 MB/s
446GB free
Firmware: 0002SDM1 Max speed: SATA 2.0 300 MB/s
Read 69.6
Write 65.4
Mixed 64
50% 66.3 MB/s
4K Read 0.38
4K Write 0.9
4K Mixed 0.33
69% 0.54 MB/s
367GB free
Firmware: 0001
Read 74.4
Write 59.8
Mixed 63.7
50% 66 MB/s
4K Read 0.32
4K Write 0.86
4K Mixed 0.38
71% 0.52 MB/s
963 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 5,353,092 HDDs tested.


AmazonUS $49.009 months ago.
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Typical ST9640320AS 640GB Builds (Compare 2,275 builds) See popular component choices, score breakdowns and rankings.
Gaming 12%
Tree trunk
Desktop 44%
Speed boat
Workstation 19%

System: Dell Inspiron N5110

EDIT WITH CUSTOM PC BUILDER Value: 67% - Good Total price: $288

Popular ST9640320AS 640GB systems:

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Hard Drive Rankings (Price vs Performance) September 2017 HDD Rankings.

Welcome to our consumer Hard Drive comparison. We calculate effective speed which measures performance for typical consumers. Effective speed is adjusted by cost per GB to yield value for money. Calculated values don't always tell the whole picture so we check them against thousands of individual user ratings. The customizable table below combines these factors and more to bring you the definitive list of top HDDs. Share your opinion by voting. [HDrivePro]


984 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

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The Best.
Intel Core i7-7700K $325Nvidia GTX 1070 $410Samsung 850 Evo 250GB $88
AMD Ryzen 7 1700 $295AMD RX 480 $350Samsung 850 Pro 256GB $119
Intel Core i5-7600K $210Nvidia GTX 1060-6GB $265Samsung 850 Evo 500GB $150
Seagate Barracuda 1TB (2016) $45G.SKILL Trident Z DDR4 3200 C14 4x16GB $711SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $70Corsair Vengeance LPX DDR4 3000 C15 2x8GB $152SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $57HyperX Fury DDR4 2133 C14 2x8GB $144SanDisk Extreme 16GB $20
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