Average Bench: 49.6% (316th of 1015)

Based on 10,039 user benchmarks.  Model: SAMSUNG HD642JJ

Below average average bench

The Samsung HD642JJ 640GB averaged 50.3% 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 0.96MB/s
Avg. 4K Random Write Speed 2.34MB/s

Above average consistency

The range of scores (95th - 5th percentile) for the Samsung HD642JJ 640GB is 34.6%. This is a relatively narrow range which indicates that the Samsung HD642JJ 640GB performs reasonably consistently under varying real world conditions.


Avg. Sequential Mixed IO Speed 54.3MB/s
Avg. Sequential Write Speed 75.9MB/s

Average Bench

(Based on 10,039 samples)
Min Avg Max
49.4 Read 88.8 114
35.1 Write 75.9 111
36.6 Mixed 54.3 63.7
42.7 SusWrite 83.7 114
55.7% 75.7 MB/s
Min Avg Max
0.5 4K Read 0.67 0.8
1.33 4K Write 2.34 3
0.6 4K Mixed 0.96 1.2
178% 1.32 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest HDD (mainstream) averages a speed of 100%
521GB free
Firmware: 1AA01117
SusWrite @10s intervals: 106 107 107 107 107 107 MB/s
Read 104
Write 49.9
Mixed 63
SusWrite 107
60% 80.9 MB/s
4K Read 0.7
4K Write 2.4
4K Mixed 1.1
196% 1.4 MB/s
594GB free
Firmware: 1AA01114
SusWrite @10s intervals: 88 111 109 110 110 108 MB/s
Read 102
Write 110
Mixed 62
SusWrite 106
70% 95 MB/s
4K Read 0.7
4K Write 3
4K Mixed 1
196% 1.57 MB/s
525GB free
Firmware: 1AA01110
SusWrite @10s intervals: 87 88 89 87 87 89 MB/s
Read 99.2
Write 46.7
Mixed 57.9
SusWrite 87.8
54% 72.9 MB/s
4K Read 0.7
4K Write 2.7
4K Mixed 1.1
201% 1.5 MB/s
372GB free
Firmware: 1AA01113
SusWrite @10s intervals: 97 96 101 101 99 100 MB/s
Read 87.6
Write 93
Mixed 58.2
SusWrite 99.1
62% 84.5 MB/s
4K Read 0.5
4K Write 2.1
4K Mixed 0.8
149% 1.13 MB/s
10,039 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 37,656,205 HDDs tested.


AmazonUS $452 months
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Typical HD642JJ 640GB Builds (Compare 601 builds) See popular component choices, score breakdowns and rankings.
Gaming 9%
Tree trunk
Desktop 62%
Workstation 8%
Tree trunk

System: Dell Studio XPS 435MT

EDIT WITH CUSTOM PC BUILDER Value: 58% - Above average Total price: $327

Popular HD642JJ 640GB 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.

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) April 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 i5-11400F $180Nvidia RTX 3060-Ti $400Crucial MX500 250GB $49
Intel Core i5-11600K $265Nvidia RTX 3070 $500Samsung 850 Evo 120GB $78
Intel Core i5-10600K $215Nvidia RTX 3080 $700Samsung 860 Evo 250GB $40
Seagate Barracuda 1TB (2016) $30Corsair Vengeance LPX DDR4 3200 C16 2x8GB $79SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $34Corsair Vengeance LPX DDR4 3000 C15 2x8GB $73SanDisk Extreme 32GB $28
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Ultra Fit 32GB $16
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