TEST: Netac ZX20 1TB external SSD

Technical data
Image
Manufacturer	Netac
Model number	NETAC-ZX20-1TB
Storage capacity	1024 GB (931 GiB)
pSLC-Cache	286 GB approx.
Read speed	2000 MB/s
Write speed	1700 MB/s
Interface	USB 3.2 Gen 2x2 (20 Gbit/s)
Connection	USB Typ C
Size (LxWxH)	71,5 x 43,5 x 8 mm
Price	ca. 103 AUD (= 0,10 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

56 %

Write speed

51 %

*) 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 5 GB file. A total score of 1317 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	1912,86 MB/s	1639,41 MB/s
4K in megabytes per second	27,49 MB/s	78,81 MB/s
4K-64Thrd in megabytes per second	279,36 MB/s	326,71 MB/s
Access time in milliseconds	0,048 ms	0,530 ms
Score	498	569
Total score	1317

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 July 14, 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	900,85 MB/s	2,55 s
Program many small files	513,41 MB/s	13,71 s
Game small and large files	797,55 MB/s	8,66 s

Compression Performance Test

Here, the writing and reading 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	2074,62	1888,88
SEQ1M Q1T1	1879,96	1727,06
RND4K Q32T16	289,13	377,72
RND4K Q1T1	34,73	86,25