TEST
YOUR USB

Prolific (ExtHD)

ATAPI-6 Bridge C 4TB

▲ 500 ▼

Release date ≈ Q4 2015.

Average Bench: 38.3% (48th of 639)

Based on 49 user benchmarks.  Device: VID 067b PID 2773 Model: Prolific ATAPI-6 Bridge C
Poor: 11%Average: 38.3% Great: 65%

Poor average bench

The Prolific ATAPI-6 Bridge C 4TB averaged 61.7% 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 2.16MB/s
Avg. Sequential Write Speed 92MB/s

Below average consistency

The range of scores (95th - 5th percentile) for the Prolific ATAPI-6 Bridge C 4TB is 54.4%. This is a relatively wide range which indicates that the Prolific ATAPI-6 Bridge C 4TB performs inconsistently under varying real world conditions.

Weaknesses

Avg. 4K Random Read Speed 0.72MB/s
Avg. 4K Random Mixed IO Speed 0.58MB/s
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Average Bench

(Based on 49 samples)
Rank 4838.3%
Min Avg Max
4 Read 94.6 182
8.7 Write 92 183
5.7 Mixed 64.5 138
1.1 SusWrite 66.8 157
105% 79.5 MB/s
Min Avg Max
0.1 4K Read 0.72 2.4
0.1 4K Write 2.16 5.8
0.1 4K Mixed 0.58 1.4
95.9% 1.15 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest USB (mainstream) averages a speed of 100%
3TB free, PID 2773
Operating at USB 2.1 Speed
SusWrite @10s intervals: 41 41 41 41 41 40 MB/s
88.3% Excellent
Read 38.7
Write 40.3
Mixed 65.5
SusWrite 40.5
65% 46.2 MB/s
4K Read 54
4K Write 19.9
4K Mixed 28.3
1,840% 34.1 MB/s
DQ Read 76.6
DQ Write 23.9
DQ Mixed 37.7
2,379% 46.1 MB/s
354GB free, PID 2773
Operating at USB 3.0 Speed
SusWrite @10s intervals: 163 161 163 163 164 164 MB/s
78.7% Very good
Read 178
Write 92.9
Mixed 75.6
SusWrite 163
163% 127 MB/s
4K Read 0.6
4K Write 5.6
4K Mixed 1.4
240% 2.53 MB/s
354GB free, PID 2773
Operating at USB 3.0 Speed
SusWrite @10s intervals: 158 159 160 159 158 159 MB/s
77.2% Very good
Read 176
Write 121
Mixed 74.6
SusWrite 159
172% 133 MB/s
4K Read 0.6
4K Write 5.5
4K Mixed 1.4
237% 2.5 MB/s
2TB free, PID 2773
Operating at USB 3.0 Speed
SusWrite @10s intervals: 167 165 166 164 161 154 MB/s
63.4% Good
Read 152
Write 168
Mixed 73.2
SusWrite 162
188% 139 MB/s
4K Read 0.4
4K Write 1.9
4K Mixed 0.8
93% 1.03 MB/s
1.5TB free, PID 2773
Operating at USB 3.0 Speed
SusWrite @10s intervals: 105 107 107 105 104 114 MB/s
53.6% Above average
Read 158
Write 157
Mixed 89
SusWrite 107
168% 128 MB/s
4K Read 1.1
4K Write 2.3
4K Mixed 1
116% 1.47 MB/s
443GB free, PID 2773
Operating at USB 2.1 Speed
SusWrite @10s intervals: 37 37 40 37 35 37 MB/s
18.3% Very poor
Read 38.8
Write 39.2
Mixed 29
SusWrite 37.2
49% 36 MB/s
4K Read 2.6
4K Write 1.3
4K Mixed 0.9
84% 1.6 MB/s
49 MORE »
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  • Fastest real world speed - Real World Speed measures performance for typical consumers.

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