TEST: Netac ZX20L 512GB external SSD
Here you can find a detailed performance and benchmark test of the external SSD ZX20L with 512GB (NETAC-ZX20L-500GB) from Netac.1402
0,10 €
| Technical data | |
| Image | 
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| Manufacturer | Netac |
| Model number | NETAC-ZX20L-500GB |
| Storage capacity | 512 GB (477 GiB) |
| pSLC-Cache | 128 GB approx. |
| Read speed | 2000 MB/s |
| Write speed | 2000 MB/s |
| Interface | USB 3.2 Gen 2x2 (20 Gbit/s) |
| Connection | USB Typ C |
| Size (LxWxH) | 102 x 30 x 9,2 mm |
| Weight | 37 gram |
| Price | ca. 53 USD (= 0,10 $ / GB) |
| Paid link | Buy on Amazon |
Compared to the top performer*
*) 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 1402 points was achieved.
| AS SSD | Read: | Write: |
|---|---|---|
| Seq in megabytes per second |
1878,96 MB/s |
1542,06 MB/s |
| 4K in megabytes per second |
27,68 MB/s |
68,23 MB/s |
| 4K-64Thrd in megabytes per second |
362,99 MB/s |
314,53 MB/s |
| Access time in milliseconds |
0,051 ms |
0,516 ms |
| Score | 579 |
537 |
| Total score | 1402 |
|
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 November 27, 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 |
746,46 MB/s |
3,08 s |
| Program many small files |
131,32 MB/s |
53,60 s |
| Game small and large files |
429,60 MB/s |
16,08 s |
Compression Performance Test
This measures the write and read speed of the external SSD from Netac, depending on the compressibility of the data (according to the manufacturer, these should be 2000 MB/s and 2000 MB/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 |
2052,76 |
1718,64 |
| SEQ1M Q1T1 |
1769,89 |
1525,00 |
| RND4K Q32T16 |
307,18 |
391,33 |
| RND4K Q1T1 |
31,58 |
77,56 |
Input/Output operations per second
| CDM | Read [IOPS] | Write [IOPS] |
|---|---|---|
| SEQ1M Q8T1 |
1.957,70 |
1.639,00 |
| SEQ1M Q1T1 |
1.687,90 |
1.454,40 |
| RND4K Q32T16 |
74.995,40 |
95.539,10 |
| RND4K Q1T1 |
7.710,90 |
18.935,10 |
Average latency
| CDM | Read [µs] | Write [µs] |
|---|---|---|
| SEQ1M Q8T1 |
4.082,16 |
4.867,67 |
| SEQ1M Q1T1 |
592,25 |
687,17 |
| RND4K Q32T16 |
6.814,86 |
5.352,00 |
| RND4K Q1T1 |
129,53 |
52,69 |
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. 128 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 832 MB/s and written with 375 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 were 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.
Information about the test system can be found at the bottom of the home page.
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