SanDisk Ultra Dual Drive 256GB
Score: 82/100
PNY Turbo Attache 3 512GB
Score: 58/100Rankings
The SanDisk 256 GB Ultra Dual Drive offers a convenient dual-connector design that bridges USB-C smartphones and legacy USB-A computers. While read performance is decent and the swivel keyring design is portable, write speeds and lack of encryption limit its suitability for demanding tasks.
The PNY 512GB Turbo Attaché 3 offers high capacity and decent read speeds in a capless sliding design, but its bulky plastic body and lack of encryption limit its suitability for security-focused or ultra-compact needs.
| Attribute | | |
|---|---|---|
256 GB | 512 GBbest | |
150 MB/sbest | 100 MB/s | |
75 MB/sbest | 30 MB/s | |
60 monthsbest | 12 months | |
| ↓ lower better | 9.1 gbest | 18 g |
| ↓ lower better | 38.1 mmbest | 133.35 mm |
| ↓ lower better | 20.7 mmbest | 99.06 mm |
| ↓ lower better | 9.4 mmbest | 11.43 mm |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Storage(1) | ||
Capacity (GB) | 256 GB | 512 GB |
Performance(2) | ||
Read Speed (MB/s) | 150 MB/s | 100 MB/s |
Write Speed (MB/s) | 75 MB/s | 30 MB/s |
Warranty(1) | ||
Warranty Period (months) | 60 months | 12 months |
Physical(4) | ||
Weight (g) | 9.1 g | 18 g |
Length (mm) | 38.1 mm | 133.35 mm |
Width (mm) | 20.7 mm | 99.06 mm |
Height (mm) | 9.4 mm | 11.43 mm |
Connectivity(1) | ||
USB Interface | USB 3.1 Gen 1 | USB 3.0 |
Compatibility(1) | ||
Operating System Compatibility | Windows; macOS; Android | Windows, macOS |
Products in the top-left offer the best value (high score, low price).
Professional reviewers commend the Ultra Dual Drive for solving the USB-C adapter problem with a sleek dual-connector design and respectable read speeds, but note the lack of rugged features and slower write performance compared to higher-end SanDisk Extreme PRO models.
Everyday users appreciate the convenience of a keychain-ready drive that easily moves photos and documents between Android phones and laptops, but many complain about sluggish write speeds, a fragile swivel hinge, and the need to reformat for macOS or Linux.
“Perfect for transferring family photos between old PCs and new phones.”
“Write speed is way slower than advertised-takes forever to copy large video files.”
“The swivel joint feels flimsy after a few months of use.”
Professional reviewers consider the Turbo Attaché 3 a solid mid-tier flash drive, highlighting its 100 MB/s read speed, plug-and-play simplicity and broad OS support, while noting the lack of hardware encryption and modest plastic construction.
Everyday users overwhelmingly praise the drive's speed, capacity and convenient sliding design, awarding it an average of 4.6 / 5 stars, though complaints focus on its bulky width, cheap plastic feel, and absence of clear write-speed specifications.
