TEST
YOUR USB

ST500LM0 (ExtHD)

21-1KJ152 500GB

▲ 500 ▼

Release date ≈ Q2 2015.

Average Bench: 38.7% (45th of 639)

Based on 11 user benchmarks.  Device: VID 11b0 PID 6388 Model: ST500LM0 21-1KJ152
Poor: 13%Average: 38.7% Great: 51%

Poor average bench

The ST500LM0 21-1KJ152 500GB averaged 61.3% 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. Sustained Write Speed 106MB/s
Avg. Sequential Write Speed 82.7MB/s

Above average consistency

The range of scores (95th - 5th percentile) for the ST500LM0 21-1KJ152 500GB is 38.2%. This is a relatively wide range which indicates that the ST500LM0 21-1KJ152 500GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. 4K Random Read Speed 0.79MB/s
Avg. 4K Random Mixed IO Speed 0.57MB/s
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Average Bench

(Based on 11 samples)
Rank 4538.7%
Min Avg Max
30.4 Read 98.7 135
4.2 Write 82.7 129
15 Mixed 63.5 103
25.6 SusWrite 106 140
118% 87.7 MB/s
Min Avg Max
0.6 4K Read 0.79 1.1
0.7 4K Write 0.84 0.98
0.22 4K Mixed 0.57 0.8
51% 0.74 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest USB (mainstream) averages a speed of 100%
449GB free, PID 6388
Operating at USB 3.0 Speed
SusWrite @10s intervals: 140 142 140 139 141 141 MB/s
52.4% Above average
Read 130
Write 129
Mixed 72.6
SusWrite 140
159% 118 MB/s
4K Read 0.7
4K Write 0.9
4K Mixed 0.8
60% 0.8 MB/s
358GB free, PID 6388
Operating at USB 3.0 Speed
SusWrite @10s intervals: 127 132 132 133 133 134 MB/s
50.7% Above average
Read 132
Write 124
Mixed 73.5
SusWrite 132
154% 115 MB/s
4K Read 0.7
4K Write 0.9
4K Mixed 0.8
60% 0.8 MB/s
412GB free, PID 6388
Operating at USB 3.0 Speed
SusWrite @10s intervals: 128 127 129 127 126 125 MB/s
48.9% Average
Read 126
Write 121
Mixed 75
SusWrite 127
151% 112 MB/s
4K Read 0.7
4K Write 0.9
4K Mixed 0.8
60% 0.8 MB/s
320GB free, PID 6388
Operating at USB 3.0 Speed
SusWrite @10s intervals: 127 128 128 127 127 129 MB/s
47% Average
Read 114
Write 4.2
Mixed 36.2
SusWrite 128
87% 70.6 MB/s
4K Read 0.6
4K Write 0.8
4K Mixed 0.6
50% 0.67 MB/s
137GB free, PID 6388
Operating at USB 3.0 Speed
SusWrite @10s intervals: 79 76 79 80 80 79 MB/s
37.1% Below average
Read 119
Write 105
Mixed 84.6
SusWrite 78.8
128% 96.8 MB/s
4K Read 1.1
4K Write 0.8
4K Mixed 0.8
58% 0.9 MB/s
70GB free, PID 6388
Operating at USB 3.0 Speed
SusWrite @10s intervals: 111 116 117 115 113 117 MB/s
35.8% Below average
Read 58.2
Write 61.5
Mixed 56.6
SusWrite 115
103% 72.8 MB/s
4K Read 0.7
4K Write 0.7
4K Mixed 0.6
47% 0.67 MB/s
70GB free, PID 6388
Operating at USB 2.1 Speed
SusWrite @10s intervals: 26 25 26 26 26 26 MB/s
12.3% Very poor
Read 30.4
Write 24.7
Mixed 19.1
SusWrite 25.6
33% 24.9 MB/s
4K Read 0.6
4K Write 0.7
4K Mixed 0.6
46% 0.63 MB/s
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