Average Bench: 26.4% (138th of 639)

Based on 12,481 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: 12%Average: 26.4% Great: 39%

Very poor average bench

The SanDisk Ultra Fit USB 3.0 64GB averaged 73.6% 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 Mixed IO Speed 2.08MB/s
Avg. 4K Random Write Speed 1.91MB/s

Good consistency

The range of scores (95th - 5th percentile) for the SanDisk Ultra Fit USB 3.0 64GB is 27%. 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 26.1MB/s
Avg. 4K Random Read Speed 4.75MB/s

Average Bench

(Based on 12,481 samples)
Min Avg Max
28.3 Read 94.4 157
12.6 Write 44.1 90.6
13.8 Mixed 47.8 102
11.6 SusWrite 26.1 38
63.1% 53.1 MB/s
Min Avg Max
2.87 4K Read 4.75 6.8
0.5 4K Write 1.91 3.2
0.9 4K Mixed 2.08 3.6
153% 2.92 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest USB (mainstream) averages a speed of 100%
50GB free, PID 5583
Operating at USB 3.0 Speed
SusWrite @10s intervals: 85 34 19 20 18 21 MB/s
Read 143
Write 89.5
Mixed 103
SusWrite 33.1
114% 92.1 MB/s
4K Read 4.3
4K Write 2.9
4K Mixed 3.6
237% 3.6 MB/s
6GB free, PID 5583
Operating at USB 2.1 Speed
SusWrite @10s intervals: 10 12 15 15 19 14 MB/s
Read 60.7
Write 19.2
Mixed 19.5
SusWrite 14
31% 28.4 MB/s
4K Read 8.4
4K Write 0
4K Mixed 1.2
72% 3.2 MB/s
12,481 MORE »


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MSRP ≈ $19 @ launch in Aug '14
AmazonUS $236 years
EbayUS $4513 mins
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USB Flash Drive Rankings (Price vs Performance) March 2024 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]


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  • Best user rated - User sentiment trumps benchmarks for this comparison.
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  • Fastest real world speed - Real World Speed measures performance for typical consumers.


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

Added 9 years ago.


5 years 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


5 years ago.

Overheats and melts in a USB3 port


9 years ago.


4 years ago.

Well probably one of the densest thumb drive ever. Suggested to buy something that are larger but priced same and offered better performance instead. One Finnish user noted heating issues for this thumb drive. This thumb drive is intended to fit in an ultra compact spaces, are light and small.


3 years ago.

Overheats after sustained loads, which hugely slows it down

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 i5-13600K $285Nvidia RTX 4060 $295Crucial MX500 250GB $31
Intel Core i5-12400F $146Nvidia RTX 4060-Ti $374Samsung 850 Evo 120GB $80
Intel Core i5-12600K $179Nvidia RTX 4070 $530Samsung 860 Evo 250GB $52
Seagate Barracuda 1TB (2016) $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $45SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $35Corsair Vengeance LPX DDR4 3000 C15 2x8GB $45SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $64G.SKILL Trident Z DDR4 3200 C14 4x16GB $346SanDisk Ultra Fit 32GB $16
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