Average Bench: 25.5% (146th of 639)

Based on 1,349 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 49.1MB/s
Avg. Sequential Mixed IO Speed 48.5MB/s

Above average consistency

The range of scores (95th - 5th percentile) for the Lexar USB Flash Drive 128GB is 34.9%. This is a relatively narrow range which indicates that the Lexar USB Flash Drive 128GB performs reasonably consistently under varying real world conditions.


Avg. 4K Random Read Speed 3.58MB/s
Avg. Sequential Read Speed 81.8MB/s

Average Bench

(Based on 1,349 samples)
Min Avg Max
28 Read 81.8 141
7.97 Write 49.1 106
10.6 Mixed 48.5 94.9
70.3% 59.8 MB/s
Min Avg Max
1.71 4K Read 3.58 6.49
0.004 4K Write 0.68 1.33
0.02 4K Mixed 0.55 1.1
54.8% 1.6 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest USB (mainstream) averages a speed of 100%
47GB free, PID a838
Operating at USB 3.0 Speed
Read 129
Write 95.4
Mixed 71.7
118% 98.8 MB/s
4K Read 5.81
4K Write 0.86
4K Mixed 0.69
74% 2.45 MB/s
88GB free, PID a838
Operating at USB 3.0 Speed
Read 95.7
Write 77.7
Mixed 68.5
99% 80.6 MB/s
4K Read 3.1
4K Write 0.67
4K Mixed 0.52
52% 1.43 MB/s
32GB free, PID a838
Operating at USB 3.0 Speed
Read 91.5
Write 76.6
Mixed 71.6
100% 79.9 MB/s
4K Read 3.02
4K Write 0.77
4K Mixed 0.59
58% 1.46 MB/s
28GB free, PID a838
Operating at USB 2.1 Speed
Read 37.7
Write 37.5
Mixed 23.5
41% 32.9 MB/s
4K Read 4.6
4K Write 0.66
4K Mixed 0.56
58% 1.94 MB/s
29GB free, PID a838
Operating at USB 2.1 Speed
Read 37.9
Write 37
Mixed 19.5
39% 31.5 MB/s
4K Read 3.34
4K Write 0.67
4K Mixed 0.51
52% 1.51 MB/s
28GB free, PID a838
Operating at USB 2.1 Speed
Read 32.7
Write 14.3
Mixed 13.7
22% 20.2 MB/s
4K Read 3.19
4K Write 0.61
4K Mixed 0.51
50% 1.44 MB/s
119GB free, PID a838
Operating at USB 2.1 Speed
Read 23.1
Write 21
Mixed 21.8
28% 22 MB/s
4K Read 1.93
4K Write 0.4
4K Mixed 0.32
32% 0.89 MB/s
1,349 MORE »
Typical USB Flash Drive 128GB Builds (Compare 808 builds) See popular component choices, score breakdowns and rankings.
Gaming 16%
Desktop 37%
Jet ski
Workstation 23%

Motherboard: Asus P5Q-E

EDIT WITH CUSTOM PC BUILDER Value: 52% - Above average Total price: $374

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) June 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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