Average Bench: 20.6% (187th of 615)

Based on 1,336 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]


Very poor average bench

The SanDisk Ultra Fit USB 3.0 16GB averaged 79.4% 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 Write Speed 1.24MB/s
Avg. 4K Random Mixed IO Speed 0.77MB/s

Good consistency

The range of scores (95th - 5th percentile) for the SanDisk Ultra Fit USB 3.0 16GB is 23.6%. 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. Sequential Write Speed 18.9MB/s
Avg. Sequential Mixed IO Speed 23.9MB/s

Average Bench

(Based on 1,336 samples)
Min Avg Max
26.3 Read 79.4 129
7.26 Write 18.9 43.7
9.48 Mixed 23.9 53.8
40.4% 40.7 MB/s
Min Avg Max
3.34 4K Read 4.81 6.1
0.79 4K Write 1.24 1.52
0.46 4K Mixed 0.77 0.94
86.4% 2.28 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest USB (mainstream) averages a speed of 100%
3GB free, PID 5583
Operating at USB 3.0 Speed
Read 122
Write 22.1
Mixed 30.9
55% 58.5 MB/s
4K Read 6.11
4K Write 1.37
4K Mixed 0.79
96% 2.75 MB/s
10GB free, PID 5583
Operating at USB 3.0 Speed
Read 120
Write 22
Mixed 28.4
53% 56.9 MB/s
4K Read 6.65
4K Write 1.12
4K Mixed 0.01
63% 2.59 MB/s
13GB free, PID 5583
Operating at USB 2.1 Speed
Read 33.9
Write 11.1
Mixed 12.6
20% 19.2 MB/s
4K Read 5.1
4K Write 1.43
4K Mixed 0.78
94% 2.43 MB/s
10GB free, PID 5583
Operating at USB 2.1 Speed
Read 36.9
Write 12.4
Mixed 12.9
22% 20.7 MB/s
4K Read 4.36
4K Write 0.28
4K Mixed 0.42
40% 1.69 MB/s
1,336 MORE »


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Typical Ultra Fit USB 3.0 16GB Builds (Compare 12,876 builds) See popular component choices, score breakdowns and rankings.
Gaming 95%
Nuclear submarine
Desktop 85%
Aircraft carrier
Workstation 66%
Battle cruiser

Motherboard: Asus Z170 PRO GAMING - $141

EDIT WITH CUSTOM PC BUILDER Value: 93% - Outstanding Total price: $975

Popular Ultra Fit USB 3.0 16GB compatible motherboards:

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  • - 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.
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USB Flash Drive Rankings (Price vs Performance) April 2017 USB Rankings.

We highlight the best USB flash drive in terms of balanced performance and value for money using price, 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 price and capacity to yield value for money. Finally thousands of individual user ratings are used to validate our benchmark figures. Vote to share your opinion. [USBFlashPro]


Stays-put storage for all your devices...

Added 2 years ago.

Poor (edit your comment) Add link

22 hrs ago.

As the other noted, this device is VERY SLOW. They TRICKED THE BENCHMARKS. Probably filling in some buffer in the driver instead of writing to the device, and only later dumping the data.


16 days ago.

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

напоминает SanDisk nCache 2.0


2 months ago.

excellent value- fastest usb I have because im a cheapie


1 day ago.

It works fine.


9 days 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


4 days ago.



3 months ago.

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

Very good

2 years ago.


8 months ago.

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

615 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.

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