TEST: Netac US9 512GB USB flash drive

Technical data
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Manufacturer	Netac
Model number	NC-US9-512GB
Storage capacity	512 GB (477 GiB)
pSLC-Cache	130 GB approx.
Read speed	1000 MB/s
Write speed	950 MB/s
Connection	USB Typ A+C
Price	ca. 60 USD (= 0,12 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

52 %

Write speed

55 %

*) 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 935 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	1016,07 MB/s	964,68 MB/s
4K in megabytes per second	28,84 MB/s	77,56 MB/s
4K-64Thrd in megabytes per second	179,79 MB/s	283,78 MB/s
Access time in milliseconds	0,049 ms	0,101 ms
Score	310	458
Total score	935

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 September 24, 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	624,04 MB/s	1,72 s
Program many small files	194,02 MB/s	7,25 s
Game small and large files	437,20 MB/s	3,16 s

Compression Performance Test

This measures the write and read speed of the the Netac USB flash driveSSD is measured depending on the compressibility of the data (according to the manufacturer, these should be 1000MB/s and 950MB/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	1089,47	1026,52
SEQ1M Q1T1	1030,54	982,83
RND4K Q32T16	200,53	330,72
RND4K Q1T1	37,05	84,59

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 150 GB was written to the medium. After approx. 130 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 1044 MB/s and written with 326 MB/s.

HD Tune Pro Benchmark

HD Tune writes a 1 GB file to the 512 GB Netac 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 512 GB Netac 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 512 GB Netac USB flash drive here. The transfer data is displayed. The more constant the line, the better.

The benchmark test was performed on September 24, 2024.
Information about the test system can be found at the bottom of the home page.
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