InLine 00031J USB4 SSD Enclosure
Here you will find a detailed speed, performance and benchmark test review. Tested was the NVMe SSD enclosure 00031J USB4 with (USB 4.0 Gen 3x2 (40 Gbit/s)) from the brand InLine.
| Technical specifications (manufacturer information) | |
| Product image | 
|
| Manufacturer | InLine |
| Model number | M234C3-U4 |
| Read speed | 3800 MB/s |
| Write speed | 3800 MB/s |
| Interface | USB 4.0 Gen 3x2 (40 Gbit/s) |
| Connector | USB Typ C |
| Dimensions (LxWxH) | 107 × 50 × 17 mm (=4.21 x 1.97 x 0.67 in) |
| Weight | 90 gram (=3.17 oz) |
| Active cooling | No |
| Controller | ASMedia ASM2464PD |
Compare product Compared to the test winner*
We put the NVMe SSD enclosure through a detailed test. You can find the test result / test report here:
AS SSD Benchmark
Standard performance test
The standard test was performed with a 5 GB file. A total score of 3050 points was achieved.
Copy performance test
A common everyday scenario is simulated here. Three test folders are created:
- ISO (folder with two large files)
- Program (folder with many small files)
- Game (folder with small and large files)
The three folders are copied using the Windows copy command (cache remains enabled). The real-world test from 01 June 2026 shows performance during simultaneous write and read operations. The lower the duration, the better.
| AS SSD Copy Benchmark | Transfer rate: | Duration: |
|---|---|---|
| ISO two large files |
1,648.02 MB/s |
1.39 s |
| Program typical program folder with many small files |
648.80 MB/s |
10.85 s |
| Game a game folder with small and large files |
1,283.58 MB/s |
5.38 s |
Compression performance test
Here, speed is measured depending on how compressible the data is.
CrystalDiskMark Benchmark
Similar to AS SSD, two sequential and two random performance tests are carried out here and the write and read speed (manufacturer specs: 3800 MB/s and 3800 MB/s) the NVMe SSD enclosure is measured.
| CDM | Read [MB/s] | Write [MB/s] |
|---|---|---|
| SEQ1M Q8T1 |
3,832.78 |
3,789.44 |
| SEQ1M Q1T1 |
3,181.49 |
3,152.99 |
| RND4K Q32T16 |
704.45 |
719.54 |
| RND4K Q1T1 |
68.41 |
122.84 |
IOPS (Input/Output operations per second)
| CDM | Read [IOPS] | Write [IOPS] |
|---|---|---|
| SEQ1M Q8T1 |
3,655.20 |
3,613.90 |
| SEQ1M Q1T1 |
3,034.10 |
3,006.90 |
| RND4K Q32T16 |
171,985.00 |
175,669.00 |
| RND4K Q1T1 |
16,702.40 |
29,991.20 |
Average latency
| CDM | Read [µs] | Write [µs] |
|---|---|---|
| SEQ1M Q8T1 |
2,187.34 |
2,209.67 |
| SEQ1M Q1T1 |
329.24 |
332.22 |
| RND4K Q32T16 |
2,871.93 |
2,814.26 |
| RND4K Q1T1 |
59.75 |
33.26 |
ATTO Disk Benchmark
Here, a 256 MB file is written to the NVMe SSD enclosure multiple times. The I/O block size varies (from 512 bytes to 64 megabytes). The larger the blocks, the faster writing and reading usually becomes.
You can find information about the test system at the bottom of the homepage.
As an Amazon Associate I earn from qualifying purchases.