Average Bench: 25.4% (147th of 639)

Based on 1,300 user benchmarks.  Device: VID 05dc PID a838 Model: Lexar USB Flash Drive

Very poor average bench

The Lexar USB Flash Drive 128GB averaged 74.5% 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. Sequential Write Speed 48.6MB/s
Avg. Sequential Mixed IO Speed 48.3MB/s

Above average consistency

The range of scores (95th - 5th percentile) for the Lexar USB Flash Drive 128GB is 35%. This is a relatively wide range which indicates that the Lexar USB Flash Drive 128GB performs inconsistently under varying real world conditions.


Avg. 4K Random Read Speed 3.6MB/s
Avg. Sequential Read Speed 82.1MB/s

Average Bench

(Based on 1,300 samples)
Min Avg Max
27.8 Read 82.1 141
7.92 Write 48.6 106
10.7 Mixed 48.3 94.8
70% 59.7 MB/s
Min Avg Max
1.7 4K Read 3.6 6.45
0.004 4K Write 0.68 1.29
0.03 4K Mixed 0.55 1.08
55.1% 1.61 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest USB (mainstream) averages a speed of 100%
115GB free, PID a838
Operating at USB 3.0 Speed
Read 130
Write 110
Mixed 18.5
97% 86.2 MB/s
4K Read 4.9
4K Write 0.83
4K Mixed 0.31
57% 2.01 MB/s
119GB free, PID a838
Operating at USB 3.0 Speed
Read 94.6
Write 102
Mixed 82.7
120% 93 MB/s
4K Read 3.95
4K Write 0.5
4K Mixed 0.47
48% 1.64 MB/s
119GB free, PID a838
Operating at USB 3.0 Speed
Read 82.5
Write 90.7
Mixed 59.2
99% 77.5 MB/s
4K Read 3.68
4K Write 0.79
4K Mixed 0.57
60% 1.68 MB/s
113GB free, PID a838
Operating at USB 3.0 Speed
Read 90.4
Write 81
Mixed 61
96% 77.4 MB/s
4K Read 2.11
4K Write 0.5
4K Mixed 0.49
42% 1.03 MB/s
108GB free, PID a838
Operating at USB 3.0 Speed
Read 97.2
Write 70.5
Mixed 97.4
111% 88.3 MB/s
4K Read 2.48
4K Write 0.002
4K Mixed 0.006
10% 0.83 MB/s
22GB free, PID a838
Operating at USB 3.0 Speed
Read 88.4
Write 50.8
Mixed 34.9
65% 58 MB/s
4K Read 2.26
4K Write 0.53
4K Mixed 0.4
40% 1.06 MB/s
5GB free, PID a838
Operating at USB 2.1 Speed
Read 30.6
Write 24.4
Mixed 12.2
26% 22.4 MB/s
4K Read 2.48
4K Write 0.61
4K Mixed 0.49
47% 1.2 MB/s
106GB free, PID a838
Operating at USB 2.1 Speed
Read 29.1
Write 15.1
Mixed 17.9
24% 20.7 MB/s
4K Read 3.04
4K Write 0.64
4K Mixed 0.5
50% 1.39 MB/s
1,300 MORE »
Typical USB Flash Drive 128GB Builds (Compare 734 builds) See popular component choices, score breakdowns and rankings.
Gaming 16%
Desktop 38%
Jet ski
Workstation 24%

Motherboard: Asus P5Q-E

EDIT WITH CUSTOM PC BUILDER Value: 61% - Good Total price: $285

Popular USB Flash Drive 128GB compatible motherboards:

How Fast Is Your USB? (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 (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write and mixed IO.
  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - 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 highest voted in class.
  • - Find the best upgrades.
  • - Share your opinion by voting.
USB Flash Drive Rankings (Price vs Performance) April 2018 USB Rankings.

We highlight the best USB flash drive in terms of balanced performance and value for money using current prices, sequential read, sequential write , 4k read and 4k write speed. The speeds are combined to form a single effective speed which measures performance for tasks such as copying photos, music and videos. Effective speed is adjusted by current price and capacity to yield value for money. Finally thousands of individual user ratings are used to validate our benchmark figures. [USBFlashPro]


Group Test Results

  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Fastest real world speed - Real World Speed measures performance for typical flash usage patterns.
  • Best value for money - Value for money is based on real world performance, price and capacity.
  • Raw speed comparison - Raw speed readings.


639 Drives (Compared) Thousands of user benchmarks compiled into one comparison list.

See how consistently different USBs perform with varying real world conditions. The charts also illustrate overall performance, popularity and rank.

 Frequently Asked Questions

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