TEST
YOUR USB

WD (ExtHD)

My Book 25DA 4TB

▲ 500 ▼

Release date ≈ Q3 2016.

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.

Strengths

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.

Weaknesses

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

(Based on 735 samples)
Rank 4041%
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
72.7% Very good
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
68.3% Good
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
2.5TB free, PID 25da
Operating at USB 3.0 Speed
SusWrite @10s intervals: 122 122 122 125 124 125 MB/s
53.2% Above average
Read 132
Write 121
Mixed 102
SusWrite 123
161% 120 MB/s
4K Read 0.9
4K Write 2.3
4K Mixed 1
116% 1.4 MB/s
999GB free, PID 25da
Operating at USB 2.1 Speed
SusWrite @10s intervals: 15 15 15 15 15 15 MB/s
13% Very poor
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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  • 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.

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