Average Bench: 41% (40th of 639)

Based on 735 user benchmarks.  Device: VID 1058 PID 25da Model: WD My Book 25DA
Poor: 15%Average: 41% Great: 68%

Below average average bench

The WD My Book 25DA 4TB averaged 59.0% 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 1.88MB/s
Avg. Sequential Write Speed 95.1MB/s

Below average consistency

The range of scores (95th - 5th percentile) for the WD My Book 25DA 4TB is 53.5%. This is a relatively wide range which indicates that the WD My Book 25DA 4TB performs inconsistently under varying real world conditions.


Avg. 4K Random Read Speed 0.87MB/s
Avg. Sequential Read Speed 101MB/s

Average Bench

(Based on 735 samples)
Min Avg Max
29.5 Read 101 165
25.4 Write 95.1 161
24.4 Mixed 73.6 123
24.1 SusWrite 93.5 164
122% 90.7 MB/s
Min Avg Max
0.6 4K Read 0.87 1
0.6 4K Write 1.88 2.7
0.5 4K Mixed 0.87 1.1
96.8% 1.21 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest USB (mainstream) averages a speed of 100%
3.5TB free, PID 25da
Operating at USB 3.0 Speed
SusWrite @10s intervals: 173 178 179 177 178 178 MB/s
Read 172
Write 175
Mixed 126
SusWrite 177
221% 163 MB/s
4K Read 1.1
4K Write 2.9
4K Mixed 1.1
140% 1.7 MB/s
3.5TB free, PID 25da
Operating at USB 3.0 Speed
SusWrite @10s intervals: 169 169 170 171 171 167 MB/s
Read 158
Write 166
Mixed 127
SusWrite 169
212% 155 MB/s
4K Read 1.1
4K Write 2.7
4K Mixed 1.1
133% 1.63 MB/s
10GB free, PID 25da
Operating at USB 3.0 Speed
SusWrite @10s intervals: 65 70 72 79 76 72 MB/s
Read 65.1
Write 70.8
Mixed 72
SusWrite 72.3
97% 70.1 MB/s
4K Read 0.5
4K Write 0.9
4K Mixed 0.5
50% 0.63 MB/s
999GB free, PID 25da
Operating at USB 2.1 Speed
SusWrite @10s intervals: 15 15 15 15 15 15 MB/s
Read 54.9
Write 25.1
Mixed 24.9
SusWrite 14.9
35% 30 MB/s
4K Read 3.6
4K Write 0.3
4K Mixed 0.9
54% 1.6 MB/s
735 MORE »
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USB Flash Drive Rankings (Price vs Performance) May 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]


Group Test Results

  • 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.


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 i5-12600K $165Nvidia RTX 4060 $293Crucial MX500 250GB $39
Intel Core i5-13600K $273Nvidia RTX 4060-Ti $385Samsung 850 Evo 120GB $80
Intel Core i3-12100F $80Nvidia RTX 4070 $542Samsung 870 Evo 250GB $45
Seagate Barracuda 1TB (2016) $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $39SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $32Corsair Vengeance LPX DDR4 3000 C15 2x8GB $48SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $62G.SKILL Trident Z DDR4 3200 C14 4x16GB $351SanDisk Ultra Fit 32GB $16
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