TEST
YOUR USB

WD (ExtHD)

My Book Duo 25F6 12TB

▲ 500 ▼

Release date ≈ Q2 2018.

Average Bench: 86.5% (5th of 639)

Based on 145 user benchmarks.  Device: VID 1058 PID 25f6 Model: WD My Book Duo 25F6
Poor: 13%Average: 86.5% Great: 127%

Very good average bench

The WD My Book Duo 25F6 12TB averaged just 13.4% lower than the peak scores attained by the group leaders. This is an excellent result which ranks the WD My Book Duo 25F6 12TB near the top of the comparison list.

Strengths

Avg. Sustained Write Speed 226MB/s
Avg. Sequential Write Speed 190MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the WD My Book Duo 25F6 12TB is 114%. This is a particularly wide range which indicates that the WD My Book Duo 25F6 12TB performs inconsistently under varying real world conditions.

Weaknesses

Avg. 4K Random Mixed IO Speed 0.44MB/s
Avg. 4K Random Read Speed 4.8MB/s
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Average Bench

(Based on 145 samples)
Rank 586.5%
Min Avg Max
33.7 Read 233 348
29.1 Write 190 306
21.6 Mixed 68.6 111
24 SusWrite 226 338
233% 179 MB/s
Min Avg Max
0.59 4K Read 4.8 19
0.2 4K Write 0.74 1.5
0.2 4K Mixed 0.44 0.67
57.7% 1.99 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest USB (mainstream) averages a speed of 100%
6TB free, PID 25f6
Operating at USB 3.0 Speed
SusWrite @10s intervals: 276 256 239 268 274 267 MB/s
117% Outstanding
Read 361
Write 266
Mixed 50.7
SusWrite 263
293% 235 MB/s
4K Read 15.3
4K Write 1.3
4K Mixed 0.6
121% 5.73 MB/s
8.5TB free, PID 25f6
Operating at USB 3.0 Speed
SusWrite @10s intervals: 270 284 277 278 272 279 MB/s
96.1% Outstanding
Read 233
Write 202
Mixed 54.5
SusWrite 277
253% 191 MB/s
4K Read 1.1
4K Write 0.6
4K Mixed 0.4
38% 0.7 MB/s
3TB free, PID 25f6
Operating at USB 3.0 Speed
SusWrite @10s intervals: 227 225 227 230 232 236 MB/s
86% Excellent
Read 242
Write 90
Mixed 14.9
SusWrite 230
174% 144 MB/s
4K Read 1.3
4K Write 0.2
4K Mixed 0.3
22% 0.6 MB/s
3TB free, PID 25f6
Operating at USB 3.0 Speed
SusWrite @10s intervals: 213 218 219 214 214 213 MB/s
77.2% Very good
Read 194
Write 176
Mixed 47.7
SusWrite 215
209% 158 MB/s
4K Read 1.2
4K Write 0.6
4K Mixed 0.5
42% 0.77 MB/s
2TB free, PID 25f6
Operating at USB 2.1 Speed
SusWrite @10s intervals: 33 34 38 39 38 38 MB/s
20.6% Poor
Read 38.4
Write 38.3
Mixed 20.9
SusWrite 36.7
45% 33.6 MB/s
4K Read 15.6
4K Write 1.1
4K Mixed 0.3
105% 5.67 MB/s
145 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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