TEST: Netac ZX20 2TB external SSD

Technical data
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Manufacturer	Netac
Model number	NETAC-ZX20-2TB
Storage capacity	2048 GB (1863 GiB)
Read speed	2000 MB/s
Write speed	1700 MB/s
Interface	USB 3.2 Gen 2x2 (20 Gbit/s)
Connection	USB Typ C
Price	ca. 190 USD (= 0,09 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

100 %

Write speed

85 %

*) 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 5 GB file. A total score of 1308 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	1907,44 MB/s	1617,85 MB/s
4K in megabytes per second	27,66 MB/s	79,74 MB/s
4K-64Thrd in megabytes per second	273,65 MB/s	329,38 MB/s
Access time in milliseconds	0,047 ms	0,539 ms
Score	492	571
Total score	1308

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 01, 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	864,99 MB/s	2,66 s
Program many small files	137,44 MB/s	51,21 s
Game small and large files	501,59 MB/s	13,77 s

Compression Performance Test

This measures the write and read speed of the SSD is measured depending on the compressibility of the data (according to the manufacturer, these should be 2000MB/s and 1700MB/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	2078,46	1768,89
SEQ1M Q1T1	1877,47	1623,80
RND4K Q32T16	267,48	335,45
RND4K Q1T1	33,88	85,59

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 300 GB was written to the medium.

HD Tune Pro Benchmark

HD Tune writes a 5 GB file to the Netac external SSD. 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 Netac external SSD . 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 Netac external SSD here. is written. The transfer data is displayed. The more constant the line, the better.

The benchmark test was performed on September 01, 2023.
Information about the test system can be found at the bottom of the home page.
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