Average Bench: 22.8% (188th of 639)

Based on 16,952 user benchmarks.  Device: VID 0781 PID 5581 Models: SanDisk SanDisk Ultra, SanDisk Ultra

Sandisk had phenomenal success with the Sandisk Extreme which I reviewed nearly two years ago. The Extreme is still one of the best flash drives available. I had high hopes for the Ultra despite its marginally more budget orientation. Unfortunately the 16GB Ultra turned out to be a disappointment. With sequential read/write speeds of just 75/9 Mbps the Ultra lies in the bottom 25% of 16GB USB 3.0 flash drives. Small file (4K) read/write speeds clocked in at 8.35/0.08 MBps which is also in the bottom 25%. On the bright side the Ultra USB 3.0 isn't overpriced so it does represents reasonable value for money but I would happily spend a little more and get the record breaking 16GB Sandisk Extreme [Feb '14 USBFlashPro]

Poor: 10%Average: 22.8% Great: 35%

Very poor average bench

The SanDisk Ultra USB 3.0 16GB averaged 77.2% 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 2.67MB/s
Avg. 4K Random Write Speed 1.98MB/s

Good consistency

The range of scores (95th - 5th percentile) for the SanDisk Ultra USB 3.0 16GB is 25.1%. This is a relatively narrow range which indicates that the SanDisk Ultra USB 3.0 16GB performs reasonably consistently under varying real world conditions.


Avg. Sustained Write Speed 15.4MB/s
Avg. Sequential Write Speed 18.9MB/s

Average Bench

(Based on 16,952 samples)
Min Avg Max
28.2 Read 83.1 147
5.2 Write 18.9 41.4
9.6 Mixed 27.3 56.8
6.95 SusWrite 15.4 28.2
38.5% 36.2 MB/s
Min Avg Max
3.2 4K Read 5.36 7
0.5 4K Write 1.98 2.9
0.7 4K Mixed 2.67 3.8
178% 3.33 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest USB (mainstream) averages a speed of 100%
15GB free, PID 5581
Operating at USB 3.0 Speed
SusWrite @10s intervals: 34 35 39 16 13 13 MB/s
Read 152
Write 37.5
Mixed 61
SusWrite 25.1
75% 69 MB/s
4K Read 5.9
4K Write 1.4
4K Mixed 2.8
165% 3.37 MB/s
13GB free, PID 5581
Operating at USB 3.0 Speed
SusWrite @10s intervals: 3.6 6.1 11 12 11 11 MB/s
Read 105
Write 12
Mixed 23.5
SusWrite 9
35% 37.4 MB/s
4K Read 5.7
4K Write 2.8
4K Mixed 3.8
246% 4.1 MB/s
5GB free, PID 5581
Operating at USB 3.0 Speed
SusWrite @10s intervals: 8.4 10 12 12 11 11 MB/s
Read 114
Write 10.9
Mixed 18.4
SusWrite 10.6
35% 38.5 MB/s
4K Read 3.7
4K Write 0
4K Mixed 3.1
119% 2.27 MB/s
10GB free, PID 5581
Operating at USB 2.1 Speed
SusWrite @10s intervals: 5 9.6 8.7 9.4 9.2 8.9 MB/s
Read 35.8
Write 9.2
Mixed 16.7
SusWrite 8.4
20% 17.5 MB/s
4K Read 5.2
4K Write 2.8
4K Mixed 3.6
237% 3.87 MB/s
16,952 MORE »


MSRP ≈ $14 @ launch in Jan '13
AmazonUS $76 mins
BHPhotoUS $1012 months
Send price feedback
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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  • - CPU tests include: integer, floating and string.
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USB Flash Drive Rankings (Price vs Performance) August 2021 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.


Move Files Quickly with Faster Transfer Speeds...

Added 7 years ago.


23 months ago.

I feel cheated. There's only 58.9 GB showing. Surely in laws relating to Sales Description you should get 64Gb or slightler over. Can you legally advertise something at more than it is?


2 years ago.


It reads 30+ and writs 20+ in usb2 I am very happy with the drive. It is real life experience—Sep '14


22 months ago.

Fast flashdrive like no other else!


4 years ago.

Pretty average usb drive got it for 3 € so worth it.

Below average

4 years ago.

Extremely slow write, so so read .. There are far better options out there. I luckily only use it as an image backup for my Windows 10 install. It's too slow for anything else.

Very poor

7 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

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Intel Core i7-11700K $360Nvidia GTX 1660S (Super) $240Samsung 850 Evo 120GB $183
Seagate Barracuda 1TB (2016) $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $79SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $31Corsair Vengeance LPX DDR4 3000 C15 2x8GB $80SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Ultra Fit 32GB $16
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