Average Bench: 25.2% (161st of 639)

Based on 12,039 user benchmarks.  Device: VID 0781 PID 5583 Models: SanDisk Ultra, SanDisk Ultra Fit

The 32GB Sandisk Ultra Fit has both a tiny form factor and a respectable performance profile. With peak sequential read/write speeds of 136/55 MBps and peak 4K read/writes of 6.6/2.0 MBps the 32GB Ultra Fit sits amongst the top 25% of 32GB flash drives. In terms of value for money the Ultra fit fares even better and is bested only by the Sandisk Extreme. Comparing the 32GB Extreme and Ultra Fit shows that the Extreme has over double the effective speed yet the extreme is only 32% more expensive than the Ultra Fit. To conclude, the 32GB Ultra Fit has good peak performance (sustained performance is far less impressive) but its key strengths are its tiny form factor and reasonable price tag. [Oct '14 USBFlashPro]

Poor: 12%Average: 25.2% Great: 38%

Very poor average bench

The SanDisk Ultra Fit USB 3.0 32GB averaged 74.8% 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 2.14MB/s
Avg. 4K Random Write Speed 1.92MB/s

Good consistency

The range of scores (95th - 5th percentile) for the SanDisk Ultra Fit USB 3.0 32GB is 26.8%. This is a relatively narrow range which indicates that the SanDisk Ultra Fit USB 3.0 32GB performs reasonably consistently under varying real world conditions.


Avg. Sustained Write Speed 23.8MB/s
Avg. 4K Random Read Speed 5.12MB/s

Average Bench

(Based on 12,039 samples)
Min Avg Max
27.8 Read 88.8 153
10.8 Write 38.4 88
12.3 Mixed 43.3 101
7.66 SusWrite 23.8 37.8
57.1% 48.6 MB/s
Min Avg Max
3.1 4K Read 5.12 6.8
0.4 4K Write 1.92 3.6
0.47 4K Mixed 2.14 4.3
157% 3.06 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest USB (mainstream) averages a speed of 100%
24GB free, PID 5583
Operating at USB 3.0 Speed
SusWrite @10s intervals: 24 32 33 32 32 33 MB/s
Read 140
Write 39.2
Mixed 29.1
SusWrite 30.9
63% 59.8 MB/s
4K Read 4.8
4K Write 1.2
4K Mixed 2.5
144% 2.83 MB/s
29GB free, PID 5583
Operating at USB 3.0 Speed
SusWrite @10s intervals: 27 39 30 30 39 42 MB/s
Read 142
Write 60
Mixed 32.5
SusWrite 34.5
74% 67.3 MB/s
4K Read 4.7
4K Write 0.6
4K Mixed 2.9
136% 2.73 MB/s
12,039 MORE »


MSRP ≈ $19 @ launch in Aug '14
AmazonUS $163 years
EbayUS $995 mins
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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) December 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.


Ultra-small and low profile drive...

Added 7 years ago.

Liked (edit your comment) Add link

3 months ago.


Yeah, so this thumb drive looks like it gets throttled after about half a second of writes (down to ~20MBPs), presumably so that it does not actually melt your computer (it gets quite hot). In short bursts, it is very fast, perfect for holding an OS, which is what I use it for, hence the high rating. Not the drive for moving lots of data around.—Jan '16


2 years ago.

as written by many users before: write is only fast for small amounts of data, then throtteled down to 20 MB/s, i assume 'thermal throtteling'. (2019 'full-plastik' model after takeover by western digital, 256 GB). i remember the previous model with alu-plug performing better, but one of two switched to read-only, i assume regarding overheating, looking for something better, 'extreme pro' is! better, but: dangerous form factor, attached by cable to prevent plug break i had plenty of disconnects ... samsung fit plus not yet tested ...


3 years ago.

I like it, but it gets hot after a few minutes (even if that doesn't matter)


13 months ago.

I bought this pen drive after watching it's write speed of 80+ MBps on this website and it turns out that it doesn't provide write speed of more than 20 MBps even on USB 3.0. This website is not very trust-able.


4 years ago.

I have two of these and both frequently disconnect in the middle of use (every 10 seconds)


4 years ago.


2 years ago.

Overheats and melts in a USB3 port


4 years ago.

Heats up and write speed drops dramatically


7 years ago.


5 years ago.

Lightning fast Read. But write speed seems to throttle after a few seconds and goes down to around 20 MB/s

Above average

5 years ago.

I just have no idea why they build a such fast pd that is capable of 90 mbps write speed in a such small form factor that it gets throtled after 5 seconds and drops down to 20 mbps. Why didnt they build a nice little heatsink on it, or a metal case that can dissapate the heat? It's a pitty. However the 140 mbps read speed is still freaking amazing :)

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.

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