Average Bench: 43.4% (445th of 1015)

more Based on 33,647 user benchmarks.  Models: ST9500420AS, Seagate ST9500420AS, ST950042 4AS, ST950042 3AS, ST950042 0ASG, ST9500423AS, ST9500424AS, ST950042 ST9500424AS, ST950042 0AS, ST950042 ST9500423AS, ST950042 ST9500420AS, ST950042 ST9500420ASG, ST9500420ASG

Below average average bench

The Seagate Momentus 2.5" 500GB averaged 56.6% 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 Read Speed 0.54MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Seagate Momentus 2.5" 500GB is 41.9%. This is a relatively wide range which indicates that the Seagate Momentus 2.5" 500GB performs inconsistently under varying real world conditions.


Avg. Sequential Mixed IO Speed 44MB/s
Avg. Sustained Write Speed 72.6MB/s

Average Bench

(Based on 33,647 samples)
Min Avg Max
16.7 Read 78.6 104
24.9 Write 75.3 100
21.3 Mixed 44 56.5
30.1 SusWrite 72.6 102
49.6% 67.6 MB/s
Min Avg Max
0.2 4K Read 0.54 0.7
0.5 4K Write 0.97 1.4
0.3 4K Mixed 0.65 0.8
113% 0.72 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest HDD (mainstream) averages a speed of 100%
465GB free
Firmware: 0006HPM1
SusWrite @10s intervals: 102 102 103 103 102 104 MB/s
Read 96.3
Write 96
Mixed 54.3
SusWrite 103
64% 87.3 MB/s
4K Read 0.7
4K Write 1.2
4K Mixed 0.8
140% 0.9 MB/s
387GB free
Firmware: 0003SDM1
SusWrite @10s intervals: 91 93 88 92 94 94 MB/s
Read 92.7
Write 79.9
Mixed 47
SusWrite 92.1
57% 77.9 MB/s
4K Read 0.6
4K Write 1.4
4K Mixed 0.9
151% 0.97 MB/s
159GB free
Firmware: 0003HPM1
SusWrite @10s intervals: 73 74 74 74 74 75 MB/s
Read 93.7
Write 63
Mixed 54.5
SusWrite 74
53% 71.3 MB/s
4K Read 0.6
4K Write 0.8
4K Mixed 0.6
106% 0.67 MB/s
14GB free (System drive)
Firmware: 0003SDM1
SusWrite @10s intervals: 34 44 32 46 60 58 MB/s
Read 67.5
Write 66.5
Mixed 44
SusWrite 45.6
41% 55.9 MB/s
4K Read 0.4
4K Write 0.9
4K Mixed 0.6
100% 0.63 MB/s
367GB free (System drive)
Firmware: 0002
SusWrite @10s intervals: 17 26 37 57 62 35 MB/s
Read 6.8
Write 10.8
Mixed 17.8
SusWrite 39.1
14% 18.6 MB/s
4K Read 0.1
4K Write 0.6
4K Mixed 0.3
49% 0.33 MB/s
33,647 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 27,349,752 HDDs tested.


AmazonUS $3525 mins
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Typical Momentus 2.5" 500GB Builds (Compare 14,553 builds) See popular component choices, score breakdowns and rankings.
Gaming 12%
Tree trunk
Desktop 57%
Workstation 23%

System: HP Pavilion dv6 Notebook PC

EDIT WITH CUSTOM PC BUILDER Value: 52% - Above average Total price: $275

Popular Momentus 2.5" 500GB systems:

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  • - 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.
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Hard Drive Rankings (Price vs Performance) June 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.


Added n/a ago.

Poor (edit your comment) Add link

15 months ago.

It's a little louder, buzzier and hotter than other HDD. Pretty slow, but that could be because I have it in a USB 2.0 enclosure.


7 months ago.

This is barely fast enough to be used as a hard drive to have games on

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 $150Nvidia GTX 1660S (Super) $230Crucial MX500 250GB $49
Intel Core i5-9600K $199Nvidia GTX 1650S (Super) $160Samsung 850 Evo 120GB $78
Intel Core i7-9700K $345Nvidia RTX 2070S (Super) $500Samsung 850 Pro 512GB $240
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3200 C16 2x8GB $74SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $40Corsair Vengeance LPX DDR4 3000 C15 2x8GB $75SanDisk Extreme 32GB $46
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $681SanDisk Ultra Fit 32GB $16
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