Average Bench: 25.7% (143rd of 639)

Based on 3,258 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]


Very poor average bench

The SanDisk Ultra Fit USB 3.0 64GB averaged 74.3% 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 Write Speed 1.3MB/s
Avg. Sequential Read Speed 97.6MB/s

Good consistency

The range of scores (95th - 5th percentile) for the SanDisk Ultra Fit USB 3.0 64GB is 28.8%. 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. Sequential Write Speed 29.5MB/s
Avg. 4K Random Read Speed 4.71MB/s

Average Bench

(Based on 3,258 samples)
Min Avg Max
27.7 Read 97.6 152
8.33 Write 29.5 56.2
10.8 Mixed 37 63.1
57.1% 54.7 MB/s
Min Avg Max
2.97 4K Read 4.71 7.39
0.66 4K Write 1.3 1.86
0.15 4K Mixed 0.61 0.81
82.4% 2.21 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest USB (mainstream) averages a speed of 100%
14GB free, PID 5583
Operating at USB 3.0 Speed
Read 142
Write 33.5
Mixed 48.3
75% 74.6 MB/s
4K Read 7.82
4K Write 1.14
4K Mixed 0.27
77% 3.07 MB/s
12GB free, PID 5583
Operating at USB 2.1 Speed
Read 36.2
Write 7.73
Mixed 12.6
19% 18.8 MB/s
4K Read 3.36
4K Write 1.17
4K Mixed 0.75
78% 1.76 MB/s
25GB free, PID 5583
Operating at USB 2.1 Speed
Read 34.1
Write 12.3
Mixed 13.8
22% 20.1 MB/s
4K Read 3.57
4K Write 0.67
4K Mixed 0.15
41% 1.46 MB/s
27GB free, PID 5583
Operating at USB 3.0 Speed
Read 25.3
Write 9.18
Mixed 18.1
20% 17.5 MB/s
4K Read 1.35
4K Write 0.35
4K Mixed 0.71
41% 0.81 MB/s
3,258 MORE »


Approx. $19 @ launch in Aug '14
EbayUS $212 mins
AmazonUS $2313 months
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Typical Ultra Fit USB 3.0 64GB Builds (Compare 19,531 builds) See popular component choices, score breakdowns and rankings.
Gaming 94%
Nuclear submarine
Desktop 85%
Aircraft carrier
Workstation 65%
Battle cruiser

Motherboard: Asus Z170 PRO GAMING - $157

EDIT WITH CUSTOM PC BUILDER Value: 85% - Excellent Total price: $1,226

Popular Ultra Fit USB 3.0 64GB 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.
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  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - RAM tests include: single/multi core bandwidth and latency.
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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.


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

Added 3 years ago.


12 months ago.

Met max benchmark speeds. Outdoes many larger thumb-drives. Crazy-small form-factor. Excellent value.


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

 Best User Rated

The Best.
Intel Core i7-8700K $330Nvidia GTX 1070 $447Samsung 850 Evo 250GB $80
Intel Core i7-7700K $290Nvidia GTX 1060-6GB $300Samsung 850 Evo 500GB $137
AMD Ryzen 5 1600 $170AMD RX 480 $350Samsung 850 Pro 256GB $163
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $183SanDisk Extreme 64GB $70
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $957SanDisk Extreme 32GB $45
Seagate Barracuda 2TB (2016) $36Corsair Vengeance LPX DDR4 3200 C16 2x8GB $195SanDisk Ultra Fit 32GB $12
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