Average Bench: 26% (139th of 639)

Based on 4,209 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]


Very poor average bench

The SanDisk Ultra Fit USB 3.0 32GB averaged 73.9% 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 1.38MB/s
Avg. 4K Random Mixed IO Speed 0.65MB/s

Good consistency

The range of scores (95th - 5th percentile) for the SanDisk Ultra Fit USB 3.0 32GB is 29.7%. 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. Sequential Write Speed 30.3MB/s
Avg. Sequential Mixed IO Speed 36.9MB/s

Average Bench

(Based on 4,209 samples)
Min Avg Max
28.5 Read 96.1 150
8.73 Write 30.3 56
10.5 Mixed 36.9 63.6
57.2% 54.4 MB/s
Min Avg Max
3.09 4K Read 5.39 7.42
0.35 4K Write 1.38 2.02
0.14 4K Mixed 0.65 0.96
88.9% 2.47 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest USB (mainstream) averages a speed of 100%
10GB free, PID 5583
Operating at USB 3.0 Speed
Read 132
Write 54.5
Mixed 61.4
91% 82.7 MB/s
4K Read 6.69
4K Write 1.78
4K Mixed 0.94
117% 3.14 MB/s
3GB free, PID 5583
Operating at USB 3.0 Speed
Read 133
Write 51.4
Mixed 60
89% 81.5 MB/s
4K Read 4.98
4K Write 1.76
4K Mixed 0.82
106% 2.52 MB/s
13GB free, PID 5583
Operating at USB 3.0 Speed
Read 132
Write 33.6
Mixed 1.85
48% 55.8 MB/s
4K Read 4.37
4K Write 1.17
4K Mixed 0.79
83% 2.11 MB/s
16GB free, PID 5583
Operating at USB 3.0 Speed
Read 145
Write 31.1
Mixed 43.9
72% 73.3 MB/s
4K Read 7.89
4K Write 0.35
4K Mixed 0.24
50% 2.83 MB/s
25GB free, PID 5583
Operating at USB 2.1 Speed
Read 35.8
Write 13.1
Mixed 16.3
24% 21.8 MB/s
4K Read 4.22
4K Write 1.52
4K Mixed 0.86
97% 2.2 MB/s
4,209 MORE »


Approx. $19 @ launch in Aug '14
EbayUS $1217 mins
AmazonUS $163 months
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Typical Ultra Fit USB 3.0 32GB Builds (Compare 21,136 builds) See popular component choices, score breakdowns and rankings.
Gaming 93%
Nuclear submarine
Desktop 85%
Aircraft carrier
Workstation 65%

Motherboard: Asus Z170 PRO GAMING - $157

EDIT WITH CUSTOM PC BUILDER Value: 86% - Excellent Total price: $1,179

Popular Ultra Fit USB 3.0 32GB compatible motherboards:

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  • - Download and run UserBenchMark (UBM).
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USB Flash Drive Rankings (Price vs Performance) June 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.


Ultra-small and low profile drive...

Added 3 years ago.

Excellent (edit your comment) Add link

25 days 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


12 months ago.


5 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.


10 months ago.

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


6 months ago.

Heats up and write speed drops dramatically


3 years ago.


2 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

2 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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