TEST: Vansuny U52 256GB USB flash drive

Technical data
Image
Manufacturer	Vansuny
Model number	U52-Gray-256G-VS-DE
Storage capacity	256 GB (238 GiB)
pSLC-Cache	4 GB approx.
Read speed	1000 MB/s
Write speed	1000 MB/s
Connection	USB Typ A+C
Price	ca. 31 USD (= 0,12 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

100 %

Write speed

100 %

*) Test result evaluated according to AS SSD Score within the same size.

AS SSD Benchmark

Standard performance test

The standard test was performed using a 1 GB file. A total score of 948 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	1014,79 MB/s	963,06 MB/s
4K in megabytes per second	31,16 MB/s	77,21 MB/s
4K-64Thrd in megabytes per second	192,91 MB/s	272,88 MB/s
Access time in milliseconds	0,049 ms	0,089 ms
Score	326	446
Total score	948

Copy Performance Test

A common everyday situation 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 (the cache remains enabled). The practical test of January 15, 2025 shows the performance for simultaneous write and read operations. The lower the duration, the better the performance.

AS SSD Copy-Benchmark	Transfer rate:	Duration:
ISO two large files	618,87 MB/s	1,74 s
Program many small files	234,31 MB/s	6,00 s
Game small and large files	485,42 MB/s	2,84 s

Compression Performance Test

This measures the write and read speed of the Vansuny USB flash drive, depending on the compressibility of the data (according to the manufacturer, these should be 1000 MB/s and 1000 MB/s respectively).

CrystalDiskMark Benchmark

Here, two sequential and two random performance tests are performed, similar to the ones performed on the AS SSD.

CDM	Read [MB/s]	Write [MB/s]
SEQ1M Q8T1	1088,87	1027,92
SEQ1M Q1T1	1030,51	976,49
RND4K Q32T16	169,99	318,66
RND4K Q1T1	32,74	84,63

HD Tune Pro Endurance test

This is a long term test to make full use of the memory capacity. You can see when a cache is full and the writing performance decreases. A test file of 100 GB was written to the medium. After approx. 4 GB, the pSLC-Cache was full and the performance was throttled.
At least the test file could be read with an average write speed of 1040 MB/s and written with 586 MB/s.

HD Tune Pro Benchmark

HD Tune writes a 1 GB file to the 256 GB Vansuny USB flash drive. The transfer data of the read speed is displayed graphically. The minimum, maximum and average values are also determined. The determined access time and burst rate are also displayed.

ATTO Disk Benchmark

Here, a 256 MB file is written several times to the 256 GB Vansuny USB flash drive. The I/O block size varies (from 512 bytes to 64 megabytes). The larger the blocks, the faster they were written and read.

SSD-Z Benchmark

Similar to HD Tune, a 500 MB file is written to the 256 GB Vansuny USB flash drive here. The transfer data is displayed. The more constant the line, the better.

The benchmark test was performed on January 15, 2025.
Information about the test system can be found at the bottom of the home page.
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