Average Bench: 27.4% (126th of 639)

Based on 3,520 user benchmarks.  Device: VID 0781 PID 5583 Model: SanDisk Ultra Fit

The 64GB SanDisk Ultra Fit is the largest capacity available in the Ultra Fit range. Both the 16GB and 32GB siblings fared well in terms of peak performance but with the majority of flash based products larger capacities are faster. Unfortunately for the Ultra Fit this proved not to be the case. Comparing the performance leading Mushkin Ventura and 64GB Ultra Fit shows that the Ventura is around 600% faster but just 60% more expensive. Although the Ultra Fit is a contender in the 32GB and 16GB capacities it doesn't fare well against the 64GB competition. If you are looking for a tiny form factor the 64GB SanDisk Ultra Fit is superb but otherwise there are better alternatives available with better peak and significantly better sustained transfer speeds. [Oct '14 USBFlashPro]

Poor: 11%Average: 27.4% Great: 39%

Very poor average bench

The SanDisk Ultra Fit USB 3.0 64GB averaged 72.6% 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 1.66MB/s
Avg. 4K Random Mixed IO Speed 1.35MB/s

Good consistency

The range of scores (95th - 5th percentile) for the SanDisk Ultra Fit USB 3.0 64GB is 27.9%. This is a relatively narrow range which indicates that the SanDisk Ultra Fit USB 3.0 64GB performs reasonably consistently under varying real world conditions.


Avg. Sustained Write Speed 27.3MB/s
Avg. 4K Random Read Speed 4.62MB/s

Average Bench

(Based on 3,520 samples)
Min Avg Max
27.3 Read 100 153
9.83 Write 38.6 85.2
12.1 Mixed 44.5 91.4
12.9 SusWrite 27.3 39.9
61% 52.7 MB/s
Min Avg Max
2.5 4K Read 4.62 7.45
0.6 4K Write 1.66 3
0.16 4K Mixed 1.35 3.4
120% 2.55 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest USB (mainstream) averages a speed of 100%
51GB free, PID 5583
Operating at USB 3.0 Speed
SusWrite @10s intervals: 60 48 25 25 23 24 MB/s
Read 153
Write 63.7
Mixed 57.2
SusWrite 34.2
88% 77 MB/s
4K Read 6.4
4K Write 1.5
4K Mixed 1.8
136% 3.23 MB/s
53GB free, PID 5583
Operating at USB 2.1 Speed
SusWrite @10s intervals: 17 20 25 25 25 25 MB/s
Read 32.2
Write 3.3
Mixed 15
SusWrite 23
22% 18.4 MB/s
4K Read 3.4
4K Write 1.7
4K Mixed 2.4
152% 2.5 MB/s
57GB free, PID 5583
Operating at USB 2.1 Speed
SusWrite @10s intervals: 20 21 16 17 17 16 MB/s
Read 33.7
Write 20.8
Mixed 23.5
SusWrite 17.8
30% 24 MB/s
4K Read 4.8
4K Write 1.8
4K Mixed 1.4
127% 2.67 MB/s
27GB free, PID 5583
Operating at USB 2.1 Speed
SusWrite @10s intervals: 15 15 16 16 15 16 MB/s
Read 28.5
Write 15.6
Mixed 19.3
SusWrite 15.4
25% 19.7 MB/s
4K Read 4.8
4K Write 2
4K Mixed 2.7
178% 3.17 MB/s
3,520 MORE »


Approx. $19 @ launch in Aug '14
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AmazonUS $2317 months
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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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USB Flash Drive Rankings (Price vs Performance) August 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.
  • 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.


So small you hardly know it’s there...

Added 3 years ago.


1 month ago.

This USB thumb drive from Sandisk is extremely small compared to most thumb drives. I can store all my work files, encrypt the USB thumb drive for security and have it attached on my key chain and in my pocket. It is not big and bulky at all. Very practical and useful device Sandisk - Excellent work!!! I will be buying bigger sized (i.e. GB) in the same form factor in the future from Sandisk. Keep them coming (i.e. very small USB Thumb Drives) Sandisk!

Info  www.sandisk.com/...

Official Sandisk website


3 years ago.

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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Intel Core i7-8700K $330Nvidia GTX 1070 $380Samsung 850 Evo 250GB $95
AMD Ryzen 5 1600 $150Nvidia GTX 1060-6GB $240Samsung 850 Evo 500GB $120
Intel Core i5-8600K $240AMD RX 480 $280Samsung 850 Pro 256GB $163
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $172SanDisk Extreme 64GB $80
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $901SanDisk Extreme 32GB $30
WD Blue 1TB (2012) $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $191SanDisk Ultra Fit 32GB $12
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