Average Bench: 25.7% (147th of 639)

Based on 10,707 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: 25.7% Great: 39%

Very poor average bench

The SanDisk Ultra Fit USB 3.0 64GB averaged 74.2% 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 2.06MB/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 64GB is 28.3%. 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 25.6MB/s
Avg. 4K Random Read Speed 4.77MB/s

Average Bench

(Based on 10,707 samples)
Min Avg Max
27.5 Read 92.8 154
7.29 Write 42.5 90.3
10.2 Mixed 45.3 99.6
7.99 SusWrite 25.6 39.6
61% 51.6 MB/s
Min Avg Max
2.5 4K Read 4.77 6.8
0.5 4K Write 1.81 3.1
0.9 4K Mixed 2.06 3.5
149% 2.88 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest USB (mainstream) averages a speed of 100%
26GB free, PID 5583
Operating at USB 3.0 Speed
SusWrite @10s intervals: 59 53 25 25 24 23 MB/s
Read 138
Write 62.1
Mixed 67
SusWrite 34.8
89% 75.6 MB/s
4K Read 6.9
4K Write 1.8
4K Mixed 1.5
138% 3.4 MB/s
24GB free, PID 5583
Operating at USB 3.0 Speed
SusWrite @10s intervals: 55 56 12 16 7.8 MB/s
Read 121
Write 62.4
Mixed 57.8
SusWrite 26.5
79% 66.9 MB/s
4K Read 5.9
4K Write 1.9
4K Mixed 1.6
141% 3.13 MB/s
39GB free, PID 5583
Operating at USB 2.1 Speed
SusWrite @10s intervals: 24 20 18 18 18 17 MB/s
Read 26.6
Write 13.2
Mixed 14.9
SusWrite 19
23% 18.4 MB/s
4K Read 2.6
4K Write 1.4
4K Mixed 1.1
95% 1.7 MB/s
4GB free, PID 5583
Operating at USB 2.1 Speed
SusWrite @10s intervals: 14 17 15 15 15 15 MB/s
Read 28.2
Write 16.4
Mixed 16.2
SusWrite 15.1
24% 19 MB/s
4K Read 3.9
4K Write 1.5
4K Mixed 1.4
113% 2.27 MB/s
10,707 MORE »


MSRP ≈ $19 @ launch in Aug '14
AmazonUS $234 years
EbayUS $4511 mins
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USB Flash Drive Rankings (Price vs Performance) January 2022 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 7 years ago.


3 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


2 years ago.

Overheats and melts in a USB3 port


7 years ago.


2 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.


17 months 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

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Seagate Barracuda 2TB (2016) $71G.SKILL Trident Z DDR4 3200 C14 4x16GB $470SanDisk Ultra Fit 32GB $16
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