TEST: Netac Z SLIM 500GB external SSD

Technical data
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Manufacturer	Netac
Model number	Netac-ZSLIM-500GB
Storage capacity	500 GB (466 GiB)
pSLC-Cache	172 GB approx.
Read speed	550 MB/s
Write speed	450 MB/s
Interface	USB 3.2 Gen 1x1 (5 Gbit/s)
Connection	USB Typ C
Size (LxWxH)	100 x 29,4 x 9 mm
Weight	30 gram
Price	ca. 48 USD (= 0,10 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

26 %

Write speed

26 %

*) 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 449 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	511,94 MB/s	473,98 MB/s
4K in megabytes per second	23,16 MB/s	52,19 MB/s
4K-64Thrd in megabytes per second	86,04 MB/s	99,00 MB/s
Access time in milliseconds	0,063 ms	0,822 ms
Score	160	199
Total score	449

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 13, 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	375,02 MB/s	6,13 s
Program many small files	104,85 MB/s	67,13 s
Game small and large files	272,09 MB/s	25,39 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 550MB/s and 450MB/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	541,11	509,56
SEQ1M Q1T1	539,39	491,33
RND4K Q32T16	111,54	121,35
RND4K Q1T1	28,79	57,35

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 200 GB was written to the medium. After approx. 172 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 521 MB/s and written with 278 MB/s.

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. The transfer data is displayed. The more constant the line, the better.

The benchmark test was performed on July 13, 2023.
Information about the test system can be found at the bottom of the home page.
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