TEST: SSK SD311 Pro 512GB USB flash drive

Technical data
Image
Manufacturer	SSK
Model number	SSK-SD311-512GB
Storage capacity	512 GB (477 GiB)
pSLC-Cache	>200 GB approx.
Read speed	1000 MB/s
Write speed	1000 MB/s
Connection	USB Typ A+C
Price	ca. 60 AUD (= 0,12 $ / GB)
Paid link	Buy on Amazon

Compare Product

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 with a 1 GB file. A total score of 985 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	962,13 MB/s	876,38 MB/s
4K in megabytes per second	31,02 MB/s	74,34 MB/s
4K-64Thrd in megabytes per second	233,89 MB/s	269,97 MB/s
Access time in milliseconds	0,051 ms	0,092 ms
Score	361	432
Total score	985

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 October 11, 2024 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	587,31 MB/s	1,83 s
Program many small files	180,67 MB/s	7,79 s
Game small and large files	409,02 MB/s	3,38 s

Compression Performance Test

Here, the writing and reading speed of the the SSK USB flash driveSSD is measured depending on the compressibility of the data (according to the manufacturer, these should be 1000MB/s and 1000MB/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	1030,64	931,89
SEQ1M Q1T1	975,78	887,49
RND4K Q32T16	228,49	305,96
RND4K Q1T1	36,32	79,08