Netac ZX20 512GB
Score: 50/100
SSK Portable SSD 256GB
Score: 53/100Rankings
The SSK 256 GB Portable SSD delivers fast USB 3.2 Gen 2 performance in a lightweight aluminum enclosure, with broad compatibility but limited capacity and no built-in encryption.
The Netac ZX20 512 GB Extreme Portable SSD offers flagship-class read/write speeds in a feather-light aluminum case, but its lack of encryption and occasional thermal throttling keep it from being a universal winner.
| Attribute | | |
|---|---|---|
512 GBbest | 256 GB | |
2,000 MB/sbest | 550 MB/s | |
1,700 MB/sbest | 500 MB/s | |
| ↓ lower better | 82 g | 43 gbest |
36 monthsbest | — |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Capacity(1) | ||
Storage Capacity (GB) | 512 GB | 256 GB |
Performance(2) | ||
Sequential Read Speed (MB/s) | 2000 MB/s | 550 MB/s |
Sequential Write Speed (MB/s) | 1700 MB/s | 500 MB/s |
Build & Design(1) | ||
Weight (g) | 82.0 g | 43 g |
Power & Connectivity(1) | ||
Included Cable Type | USB‑C to USB‑C, USB‑C to USB‑A | USB-A to USB-C, USB-C to USB-C |
Compatibility(1) | ||
Operating System Compatibility | Windows, macOS, Linux, Android, consoles, smartphones | Windows, macOS, Linux, Android |
Technical Specs(1) | ||
NAND Type | NVMe | 3D NAND |
Products in the top-left offer the best value (high score, low price).
Professional reviewers note that the ZX20's NVMe-based design and USB 3.2 Gen 2 interface place it on par with flagship portable SSDs, highlighting its impressive read/write performance and excellent price-to-performance ratio, while cautioning about potential thermal throttling and unproven long-term endurance.
Everyday users overwhelmingly praise the drive's speed, pocket-size form factor, and the inclusion of both Type-C and Type-A cables, though some report warm temperatures during long transfers and occasional recognition issues with older hardware.
Professional reviewers note performance comparable to premium models like the Samsung T5 while keeping costs low, praising the aluminum enclosure and dual cables but pointing out the lack of encryption as a drawback.
Everyday users rate the drive highly for speed and portability, though they mention the modest 256 GB size and occasional write-speed throttling.
“blazing-fast transfer speeds”
“compact size and lightweight design are ideal for travel and fieldwork”
“drive can become warm during extended transfers”
