TEST: SSK SD300 256GB USB flash drive

Technical data
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Manufacturer	SSK
Model number	SSK-SD300-256GB
Storage capacity	256 GB (238 GiB)
pSLC-Cache	88 GB approx.
Read speed	550 MB/s
Write speed	500 MB/s
Connection	USB Typ A
Price	ca. 38 USD (= 0,15 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

52 %

Write speed

50 %

*) 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 561 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	535,22 MB/s	486,68 MB/s
4K in megabytes per second	26,71 MB/s	56,78 MB/s
4K-64Thrd in megabytes per second	104,90 MB/s	166,95 MB/s
Access time in milliseconds	0,066 ms	0,138 ms
Score	185	272
Total score	561

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 April 29, 2023 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	381,29 MB/s	2,82 s
Program many small files	180,29 MB/s	7,80 s
Game small and large files	315,70 MB/s	4,37 s

Compression Performance Test

This measures the write and read speed of the the SSK USB flash driveSSD is measured depending on the compressibility of the data (according to the manufacturer, these should be 550MB/s and 500MB/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	569,19	515,22
SEQ1M Q1T1	547,40	493,72
RND4K Q32T16	160,33	192,99
RND4K Q1T1	37,78	61,42

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. 88 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 549 MB/s and written with 336 MB/s.

HD Tune Pro Benchmark

HD Tune writes a 1 GB file to the 256 GB SSK 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 SSK USB flash drive. The I/O block size varies (from 512 bytes to 64 megabytes). The larger the blocks, the faster they can be written and read.

SSD-Z Benchmark

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

The benchmark test was performed on April 29, 2023.
Information about the test system can be found at the bottom of the home page.
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