TEST
YOUR USB

WD (ExtHD)

My Book Duo 25F6 20TB

▲ 500 ▼

Release date ≈ Q4 2017.

Average Bench: 95.4% (5th of 639)

Based on 307 user benchmarks.  Device: VID 1058 PID 25f6 Model: WD My Book Duo 25F6
Poor: 19%Average: 95.4% Great: 141%

Excellent average bench

The WD My Book Duo 25F6 20TB averaged just 4.5% lower than the peak scores attained by the group leaders. This is an excellent result which ranks the WD My Book Duo 25F6 20TB near the top of the comparison list.

Strengths

Avg. Sequential Write Speed 233MB/s
Avg. Sustained Write Speed 227MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the WD My Book Duo 25F6 20TB is 122%. This is a particularly wide range which indicates that the WD My Book Duo 25F6 20TB performs inconsistently under varying real world conditions.

Weaknesses

Avg. 4K-64Thread Read Speed 0.5MB/s
Avg. 4K Random Mixed IO Speed 0.76MB/s
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Average Bench

(Based on 307 samples)
Rank 595.4%
Min Avg Max
30.8 Read 239 347
25.3 Write 233 348
28.2 Mixed 126 200
14.5 SusWrite 227 366
275% 206 MB/s
Min Avg Max
1.04 4K Read 7.47 16.6
1.64 4K Write 3.15 4.4
0.4 4K Mixed 0.76 1.3
161% 3.79 MB/s
Min Avg Max
0.5 DQ Read 0.5 0.5
2.6 DQ Write 2.6 2.6
1.2 DQ Mixed 1.2 1.2
131% 1.43 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest USB (mainstream) averages a speed of 100%
14TB free, PID 25f6
Operating at USB 3.0 Speed
SusWrite @10s intervals: 347 364 349 364 368 353 MB/s
146% Outstanding
Read 345
Write 345
Mixed 232
SusWrite 357
433% 320 MB/s
4K Read 15.9
4K Write 4.7
4K Mixed 1.3
263% 7.3 MB/s
15.5TB free, PID 25f6
Operating at USB 3.0 Speed
SusWrite @10s intervals: 380 388 379 384 388 383 MB/s
146% Outstanding
Read 345
Write 321
Mixed 150
SusWrite 383
401% 300 MB/s
4K Read 6.4
4K Write 3.4
4K Mixed 1
173% 3.6 MB/s
7TB free, PID 25f6
Operating at USB 3.0 Speed
SusWrite @10s intervals: 254 266 252 265 272 263 MB/s
113% Outstanding
Read 305
Write 282
Mixed 142
SusWrite 262
326% 248 MB/s
4K Read 5.7
4K Write 3.3
4K Mixed 0.8
161% 3.27 MB/s
9TB free, PID 25f6
Operating at USB 3.0 Speed
SusWrite @10s intervals: 221 224 224 224 221 224 MB/s
104% Outstanding
Read 299
Write 348
Mixed 165
SusWrite 223
345% 259 MB/s
4K Read 5.8
4K Write 3.4
4K Mixed 1.1
174% 3.43 MB/s
9.5TB free, PID 25f6
Operating at USB 2.1 Speed
SusWrite @10s intervals: 41 40 40 41 41 41 MB/s
26.5% Poor
Read 50.8
Write 37.7
Mixed 36.5
SusWrite 40.7
55% 41.4 MB/s
4K Read 14.7
4K Write 2.2
4K Mixed 0.9
160% 5.93 MB/s
10TB free, PID 25f6
Operating at USB 2.1 Speed
SusWrite @10s intervals: 39 41 41 41 41 42 MB/s
25.6% Poor
Read 51.4
Write 37.7
Mixed 33.9
SusWrite 40.8
54% 41 MB/s
4K Read 10.7
4K Write 2.2
4K Mixed 0.8
142% 4.57 MB/s
307 MORE »
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