Here you will find a detailed speed, performance and benchmark test review. Tested was the USB flash drive USB Stick with 128GB (FDU061) from the brand SSK.
| Technical specifications (manufacturer information) | |
| Product image |
|
| Manufacturer | SSK |
| Model number | FDU061 |
| Capacity | 128 GB (116 GiB) |
| Read speed | 150 MB/s |
| Write speed | 100 MB/s |
| Interface | USB 3.2 Gen 1x1 (5 Gbit/s) |
| Connector | USB Typ A+C |
| Controller | n/a |
Volume: E: Controller: Unknown Possible Memory Chip(s): Not available VID: 24A9 PID: 205A Manufacturer: SSK Corporation Product: USB3.2 Flash Drive Query Vendor ID: SSK Query Product ID: USB3.2 Query Product Revision: Physical Disk Capacity: 125068902400 Bytes Windows Disk Capacity: 125065494528 Bytes Internal Tags: 2CWF-QAE4 File System: EXFAT Relative Offset: 32 KB USB Version: 3.10 Declared Power: 304 mA
We put the 128 GB SSK USB flash drive through a detailed test. You can find the test result / test report here:
The standard test was performed with a 1 GB file. A total score of 40 points was achieved.
A common everyday scenario is simulated here. Three test folders are created:
The three folders are copied using the Windows copy command (cache remains enabled). The real-world test from 12 October 2023 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 |
49.44 MB/s |
21.72 s |
| Program typical program folder with many small files |
18.11 MB/s |
77.70 s |
| Game a game folder with small and large files |
35.60 MB/s |
38.79 s |
Here, speed is measured depending on how compressible the data is.
Similar to AS SSD, two sequential and two random performance tests are carried out here and the write and read speed (manufacturer specs: 150 MB/s and 100 MB/s) the SSK USB flash drive is measured.

| CDM | Read [MB/s] | Write [MB/s] |
|---|---|---|
| SEQ1M Q8T1 |
128.63 |
74.72 |
| SEQ1M Q1T1 |
138.43 |
73.96 |
| RND4K Q32T16 |
13.87 |
1.95 |
| RND4K Q1T1 |
10.64 |
1.32 |
| CDM | Read [IOPS] | Write [IOPS] |
|---|---|---|
| SEQ1M Q8T1 |
122.70 |
71.30 |
| SEQ1M Q1T1 |
132.00 |
70.50 |
| RND4K Q32T16 |
3,386.00 |
475.80 |
| RND4K Q1T1 |
2,598.40 |
321.50 |
| CDM | Read [µs] | Write [µs] |
|---|---|---|
| SEQ1M Q8T1 |
64,709.30 |
110,724.00 |
| SEQ1M Q1T1 |
7,565.24 |
14,138.40 |
| RND4K Q32T16 |
106,099.00 |
289,884.00 |
| RND4K Q1T1 |
384.60 |
3,103.76 |
A long-term test was performed to fully utilize the storage. You can see at what point the cache (if present) becomes full and write performance drops. A test file of 4 GB was written to the medium.
Here, a 256 MB file is written to the 128 GB SSK USB flash drive 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.

Similar to HD Tune, a 500 MB file is written to the 128 GB SSK USB flash drive here. The transfer data is displayed. The more consistent the line, the better. Unfortunately, the tool no longer works correctly from around 4,000 MB/s and no line is displayed (and sometimes incorrect min/max data is shown).

You can find information about the test system at the bottom of the homepage.
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