TEST
YOUR USB

JMicron (ExtHD)

Generic 256GB

▲ 5015 ▼

Release date ≈ Q1 2017.

Average Bench: 130% (3rd of 639)

Based on 157 user benchmarks.  Device: VID 152d PID 0578 Model: JMicron Generic
Poor: 20%Average: 130% Great: 256%

Outstanding average bench

The JMicron Generic 256GB averaged 30.1% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the JMicron Generic 256GB near the top of the comparison list.

Strengths

Avg. 4K-64Thread Write Speed 44.3MB/s
Avg. 4K Random Write Speed 24MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the JMicron Generic 256GB is 236%. This is a particularly wide range which indicates that the JMicron Generic 256GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. Sequential Read Speed 164MB/s
Avg. 4K Random Read Speed 13.2MB/s
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Average Bench

(Based on 157 samples)
Rank 3130%
Min Avg Max
24.9 Read 164 312
21.3 Write 144 309
21.9 Mixed 129 278
16.9 SusWrite 134 296
191% 143 MB/s
Min Avg Max
3.5 4K Read 13.2 24.2
3.49 4K Write 24 55
2.3 4K Mixed 12.5 28.5
1,290% 16.6 MB/s
Min Avg Max
9.51 DQ Read 20.4 30.9
18.2 DQ Write 44.3 73.6
7.08 DQ Mixed 19.1 39.2
2,231% 27.9 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest USB (mainstream) averages a speed of 100%
78GB free, PID 0578
Operating at USB 3.0 Speed
SusWrite @10s intervals: 242 245 249 256 255 255 MB/s
183% Outstanding
Read 305
Write 256
Mixed 187
SusWrite 250
329% 250 MB/s
4K Read 19.2
4K Write 25.9
4K Mixed 17.9
1,561% 21 MB/s
DQ Read 20.6
DQ Write 29
DQ Mixed 19.6
1,729% 23.1 MB/s
74GB free, PID 0578
Operating at USB 3.0 Speed
SusWrite @10s intervals: 234 233 241 250 251 249 MB/s
159% Outstanding
Read 261
Write 229
Mixed 154
SusWrite 243
295% 222 MB/s
4K Read 13.3
4K Write 21.3
4K Mixed 14.2
1,257% 16.3 MB/s
DQ Read 20.5
DQ Write 27.4
DQ Mixed 19
1,654% 22.3 MB/s
105GB free, PID 0578
Operating at USB 3.0 Speed
SusWrite @10s intervals: 216 209 211 214 209 214 MB/s
157% Outstanding
Read 268
Write 248
Mixed 182
SusWrite 212
302% 228 MB/s
4K Read 13.3
4K Write 22.5
4K Mixed 17.6
1,413% 17.8 MB/s
DQ Read 19.8
DQ Write 31.9
DQ Mixed 22.9
1,937% 24.9 MB/s
86GB free, PID 0578
Operating at USB 3.0 Speed
SusWrite @10s intervals: 143 138 135 131 131 130 MB/s
104% Outstanding
Read 72.9
Write 100
Mixed 81.7
SusWrite 135
140% 97.4 MB/s
4K Read 5.4
4K Write 20.5
4K Mixed 3.4
833% 9.77 MB/s
DQ Read 3.3
DQ Write 27
DQ Mixed 4
1,067% 11.4 MB/s
170GB free, PID 0578
Operating at USB 2.1 Speed
SusWrite @10s intervals: 20 21 20 21 18 14 MB/s
19.7% Very poor
Read 27
Write 21.8
Mixed 24
SusWrite 19.1
31% 23 MB/s
4K Read 3.6
4K Write 3.5
4K Mixed 3.4
248% 3.5 MB/s
157 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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