Average Bench: 21.7% (199th of 639)

Based on 9,534 user benchmarks.  Device: VID 0781 PID 5583 Model: SanDisk Ultra Fit

The 16GB SanDisk Ultra Fit USB 3.0 is a remarkable flash drive. As well as packing a tiny form factor, the Ultra fit also boasts an impressive peak performance profile with maximum sequential read/writes of 129/46 MBps and 4K read/writes of 6.08/1.51 MBps. The Ultra Fit is actually only bested by three other 16GB models (Sandisk Extreme, Lexar P10, Lexar Triton) all of which cost between from 60-230% more. In terms of outright performance there are better alternatives but in terms of value for money the Ultra Fit is hard to beat. The superbly low price coupled with an amazing form factor which is barely larger than a USB socket make it easy to recommend the 16GB Ultra fit as the best small form factor flash drive on the market. The only thing to watch with the Ultra Fit are its sustained speeds which are significantly lower than peak. [Oct '14 USBFlashPro]

Poor: 11%Average: 21.7% Great: 31%

Very poor average bench

The SanDisk Ultra Fit USB 3.0 16GB averaged 78.3% 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 2.42MB/s
Avg. 4K Random Write Speed 1.81MB/s

Good consistency

The range of scores (95th - 5th percentile) for the SanDisk Ultra Fit USB 3.0 16GB is 20.4%. This is a relatively narrow range which indicates that the SanDisk Ultra Fit USB 3.0 16GB performs reasonably consistently under varying real world conditions.


Avg. Sustained Write Speed 12.8MB/s
Avg. Sequential Write Speed 27.5MB/s

Average Bench

(Based on 9,534 samples)
Min Avg Max
27.3 Read 83.3 134
11.2 Write 27.5 43.3
12.4 Mixed 29.7 57.2
6 SusWrite 12.8 20.6
41.9% 38.4 MB/s
Min Avg Max
3.3 4K Read 5.28 7
0.3 4K Write 1.81 2.7
0.8 4K Mixed 2.42 3.7
163% 3.17 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest USB (mainstream) averages a speed of 100%
8GB free, PID 5583
Operating at USB 3.0 Speed
SusWrite @10s intervals: 17 20 21 18 21 21 MB/s
Read 130
Write 24.3
Mixed 38.6
SusWrite 19.8
55% 53.2 MB/s
4K Read 4.3
4K Write 1.4
4K Mixed 2.4
145% 2.7 MB/s
8GB free, PID 5583
Operating at USB 3.0 Speed
SusWrite @10s intervals: 18 14 14 14 13 14 MB/s
Read 128
Write 42.6
Mixed 27.2
SusWrite 14.5
55% 53.1 MB/s
4K Read 6.4
4K Write 1.1
4K Mixed 1.3
105% 2.93 MB/s
3GB free, PID 5583
Operating at USB 2.1 Speed
SusWrite @10s intervals: 17 17 7.6 8.3 8.9 9 MB/s
Read 30.2
Write 16.7
Mixed 20.4
SusWrite 11.2
24% 19.6 MB/s
4K Read 3.3
4K Write 1.8
4K Mixed 3
176% 2.7 MB/s
11GB free, PID 5583
Operating at USB 2.1 Speed
SusWrite @10s intervals: 12 12 11 8.2 5.9 10 MB/s
Read 25.2
Write 10.8
Mixed 7.9
SusWrite 9.9
16% 13.5 MB/s
4K Read 1
4K Write 0.8
4K Mixed 1.6
85% 1.13 MB/s
9,534 MORE »


MSRP ≈ $12 @ launch in Aug '14
AmazonUS $71 month
EbayUS $814 mins
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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.
  • - 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.
  • - SkillBench (space shooter) tests user input accuracy.
  • - Reports are generated and presented on userbenchmark.com.
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USB Flash Drive Rankings (Price vs Performance) December 2021 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.
  • 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.


Stays-put storage for all your devices...

Added 7 years ago.


4 years ago.

Image  s23.postimg.org/...
напоминает SanDisk nCache 2.0

напоминает SanDisk nCache 2.0


3 years ago.

Testing software isn't relieable because it shows fake write speed which includes write buffer. The real write speed is ~10MB/s so it is really slow for that capacity. Even my old pendrive - Kingston Data Traveler 8GB USB2.0 has above 20MB/s write speed


10 months ago.

so dam slow, was expecting usb 3 speeds but its junk 12mb/s c rate garbage


2 years ago.

Overheats and melts in a USB3 port


4 years ago.

The real write speed when copying data is ~10MB/s.

Very good

7 years ago.


2 years ago.



5 years ago.

Real-world write speeds are only 10-12MB/s which is very poor. The benchmarks seem incorrect.

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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