Kingston DataTraveler 100 G3 128GB
Score: 40/100
SanDisk Ultra 512GB
Score: 77/100Rankings
The SanDisk Ultra 512 GB USB 3.0 flash drive offers a high capacity and solid read performance with built-in encryption, all in a compact slide-to-reveal design. It is backed by a five-year warranty but lags in sustained write speed and lacks an activity LED or USB-C connector.
The Kingston DataTraveler 100 G3 128 GB offers solid read performance and a convenient sliding cap, but its write speeds and random performance are extremely low, making it best for occasional read-heavy tasks.
| Attribute | | |
|---|---|---|
128 GB | 512 GBbest | |
114 MB/s | 130 MB/sbest | |
3.14 MB/sbest | — | |
60 monthsbest | 60 monthsbest | |
| ↓ lower better | 20 gbest | 20 gbest |
| ↓ lower better | 59.9 mm | 10.7 mmbest |
| ↓ lower better | 21.3 mmbest | 22.1 mm |
| ↓ lower better | 10 mm | 7.9 mmbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Storage(1) | ||
Capacity (GB) | 128 GB | 512 GB |
Performance(2) | ||
Read Speed (MB/s) | 114 MB/s | 130 MB/s |
Write Speed (MB/s) | 3.14 MB/s | 12-25 MB/s |
Security(1) | ||
Encryption Support | false | true |
Physical(3) | ||
Length (mm) | 59.9 mm | 10.7 mm |
Width (mm) | 21.3 mm | 22.1 mm |
Height (mm) | 10 mm | 7.9 mm |
Connectivity(1) | ||
USB Interface | USB 3.2 Gen 1 | USB 3.0 |
Products in the top-left offer the best value (high score, low price).
Professional reviewers acknowledge the drive's solid sequential read capability but criticize its abysmal write and 4K random performance, giving it an AS SSD benchmark score of 0.
Users appreciate the large capacity and easy sliding cap, but many complain about painfully slow write speeds and inconsistent copying.
“Sleek case and worked very nicely for what I needed it for”
“Does exactly what you expect it to do”
“Great product!!!”
Professional reviewers praise the Ultra CZ48 series for its reliable read performance, solid 5-year warranty and the rare inclusion of useful encryption software, positioning it as a good value mid-tier flash drive. They caution that the advertised 130 MB/s read speed is achievable only under optimal conditions, the write speed lags behind premium competitors, and the lack of USB-C limits its appeal for newer laptops.
Everyday users rate the drive 4.6-4.8 stars, highlighting its ease of use, fast large-file transfers and the convenience of built-in encryption. Recurring complaints focus on slower write speeds, exFAT compatibility limits with entertainment devices, and the physical width making insertion into cramped ports tricky.
