TEST
YOUR USB

WD (ExtHD)

Elements 25A1 4TB

▲ 500 ▼

Release date ≈ Q3 2017.

Average Bench: 43.5% (33rd of 639)

Based on 8,402 user benchmarks.  Device: VID 1058 PID 25a1 Model: WD Elements 25A1
Poor: 20%Average: 43.5% Great: 61%

Below average average bench

The WD Elements 25A1 4TB averaged 56.5% 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-64Thread Write Speed 9.8MB/s
Avg. 4K Random Write Speed 4.77MB/s

Average consistency

The range of scores (95th - 5th percentile) for the WD Elements 25A1 4TB is 41.6%. This is a relatively wide range which indicates that the WD Elements 25A1 4TB performs inconsistently under varying real world conditions.

Weaknesses

Avg. 4K-64Thread Read Speed 0.38MB/s
Avg. 4K Random Read Speed 1.02MB/s
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Average Bench

(Based on 8,402 samples)
Rank 3343.5%
Min Avg Max
29 Read 82.4 123
25.7 Write 77 107
24.1 Mixed 57.7 78
24.5 SusWrite 76.2 109
98.5% 73.3 MB/s
Min Avg Max
0.5 4K Read 1.02 1.6
0.8 4K Write 4.77 7.9
0.2 4K Mixed 0.7 0.9
190% 2.16 MB/s
Min Avg Max
0.22 DQ Read 0.38 0.4
7.68 DQ Write 9.8 11.6
0.4 DQ Mixed 0.56 0.7
354% 3.58 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest USB (mainstream) averages a speed of 100%
418GB free, PID 25a1
Operating at USB 3.1 Speed
SusWrite @10s intervals: 103 107 110 108 109 110 MB/s
62.9% Good
Read 120
Write 107
Mixed 71.9
SusWrite 108
135% 102 MB/s
4K Read 1.3
4K Write 7.1
4K Mixed 0.8
274% 3.07 MB/s
3.5TB free, PID 25a1
Operating at USB 3.1 Speed
SusWrite @10s intervals: 103 103 104 104 103 104 MB/s
55.7% Above average
Read 134
Write 96.9
Mixed 66.6
SusWrite 104
130% 100 MB/s
4K Read 0.7
4K Write 4.4
4K Mixed 0.6
173% 1.9 MB/s
3.5TB free, PID 25a1
Operating at USB 3.1 Speed
SusWrite @10s intervals: 107 114 111 112 114 110 MB/s
55.3% Above average
Read 133
Write 112
Mixed 81.1
SusWrite 111
144% 109 MB/s
4K Read 1.5
4K Write 3.7
4K Mixed 0.8
159% 2 MB/s
2.5TB free, PID 25a1
Operating at USB 3.1 Speed
SusWrite @10s intervals: 91 90 91 91 91 91 MB/s
44.7% Average
Read 96.1
Write 86.5
Mixed 65.7
SusWrite 90.7
114% 84.8 MB/s
4K Read 1.1
4K Write 3.5
4K Mixed 0.8
150% 1.8 MB/s
1.5TB free, PID 25a1
Operating at USB 3.1 Speed
SusWrite @10s intervals: 79 83 83 83 83 83 MB/s
42.9% Average
Read 83.2
Write 79.6
Mixed 65.5
SusWrite 82.3
105% 77.6 MB/s
4K Read 1.1
4K Write 4.1
4K Mixed 0.9
174% 2.03 MB/s
3.5TB free, PID 25a1
Operating at USB 2.1 Speed
SusWrite @10s intervals: 21 19 22 23 25 20 MB/s
14.9% Very poor
Read 58.1
Write 22.2
Mixed 27
SusWrite 21.7
38% 32.2 MB/s
4K Read 3.5
4K Write 0.3
4K Mixed 1.1
61% 1.63 MB/s
8,402 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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