UnionSine USB C Flash Drive 128GB, USB3.2 Solid State External SSD (FD450)
Quick take
The UnionSine FD450 is a compact USB-C external solid-state drive built for quick storage expansion on phones, tablets, and laptops with USB-C (OTG support). It targets fast file transfers with USB 3.2 (up to 450MB/s read speed), and buyers report it is practical for moving large photo and video libraries. The main catch is that it is a USB-C stick, so you may need an adapter if your computer uses USB-A.
Pros and cons
Pros
- USB-C plug-and-play for compatible OTG devices, making backups and file offloads straightforward.
- Fast transfer performance with USB 3.2 and up to 450MB/s read speed.
- Compact “SSD-stick” form factor that’s easy to carry.
- Designed for high-bitrate video workflows, including support for 4K 60fps ProRes recording.
Cons
- No USB-A to USB-C adapter included, which can slow setup if your laptop only has USB-A.
- Can protrude from some laptop ports, meaning it may not sit perfectly flat on thicker or tight-sleeve designs.
- Write speed is typically lower than read speed, so real-world “peak” speeds depend on workload.
What buyers think
Buyer-review evidence highlights three recurring themes: convenience, speed, and real storage usability. Multiple buyers describe quick transfers when moving photos and videos, and they emphasize the drive’s tiny, pocket-friendly design compared with bulkier external SSDs. Several reviewers also focus on compatibility and setup, including direct USB-C connection to phones without extra power. There are limited mentions about speed behavior, but the pattern suggests you should expect read performance to outpace writes. Overall, buyer-review evidence is consistent enough to support “portable and easy to use,” with performance depending on device and file type.
Why choose the UnionSine FD450 128GB USB-C SSD stick?
If you want an external SSD that is closer to a thumb drive than a traditional drive enclosure, the FD450’s design is the point. With USB-C connectivity and plug-and-play support for compatible OTG devices, it is built for people who routinely move media from phones to laptops, or who want to free up phone storage without relying on cloud syncing.
Speed and daily file transfer experience
The FD450 uses USB 3.2 and is rated for up to 450MB/s read. In practice, buyers tend to care less about theoretical peak numbers and more about how quickly they can offload large batches of photos, videos, or other media files. Reviews describe noticeably fast transfers for common use cases like backup and media movement, with an additional note that write speeds can be somewhat slower than read speeds.
Compatibility: which devices it works with best
Because this is a USB-C stick, your success mostly comes down to whether your device supports USB-C storage via OTG and whether your computer port type matches.
- Best fit: phones, tablets, and laptops with USB-C ports that support external storage.
- Also intended for: compatible TVs and car audio systems that accept USB-C storage.
- Backward compatibility: it’s designed to work with USB 3.0 and USB 2.0 ports as well, but you should expect performance to scale down on slower interfaces.
- Potential snag: the package does not include a USB-A to USB-C adapter, so USB-A-only setups may require a separate adapter or hub.
Capacity expectations (128GB is not fully usable)
For storage devices, you can expect formatted capacity to be lower due to how manufacturers and operating systems measure gigabytes. The drive uses the standard convention that formatted space is typically about 7% to 10% lower than the labeled capacity. For example, 128GB may display closer to around 119GB after formatting, depending on your device.
Video recording support for mobile creators
Beyond backups and media offloads, the FD450 is positioned for mobile video recording, including 4K 60fps ProRes support. If you shoot high-bitrate footage and need quick external recording/storage on a USB-C OTG-compatible workflow, this is one of the reasons to consider a compact SSD-stick instead of a slower USB flash option.
Pros and cons recap
- Pros: compact and easy to carry, strong plug-and-play fit for USB-C/OTG devices, high rated read speed, and mobile-friendly video recording support.
- Cons: no USB-A to USB-C adapter included, possible port protrusion on some laptops, and write speeds may not match the headline read speed.
Who should buy this drive?
- You frequently move photos and videos between a phone/tablet and a laptop, and you want it to be as simple as plugging in.
- You want a pocket-sized external SSD rather than a bulky drive enclosure or cable setup.
- You film in formats that need external storage reliability, and your setup supports USB-C OTG recording workflows.
Who should avoid it?
- Your main device connections are USB-A only and you don’t want to use adapters or a hub.
- Your laptop ports are positioned such that a stick-style drive would be awkward, protruding, or hard to keep stable in use.
- You need a lot more capacity than 128GB for ongoing large video libraries. (In that case, stepping up to a higher-capacity option is usually the better long-term move.)
Price and availability
The FD450 is positioned as a mid-range option in the external SSD category, with the 128GB model often chosen for travel and light creator workloads. For the most current pricing and stock status in your region, check the live listing.
Verdict
The UnionSine FD450 is a solid choice if you want a USB-C SSD stick that’s genuinely portable and fast enough for everyday photo and video offloads. It looks especially appealing for USB-C OTG users who want fewer cables and more speed than standard flash drives. Just plan for the USB-C-only nature of the stick (and potential laptop port protrusion), and you will likely find it a practical add-on for travel, backups, and mobile media workflows.
FAQ
Will this work with an iPhone
It is designed for USB-C OTG-style connections on supported iPhone models (the product positioning targets iPhone 15/16/17 series). You will still need a compatible Apple iPhone connection setup for external storage, such as the correct adapter/cable path for your model.
Does the package include a USB-A to USB-C adapter
No. If your computer only has USB-A ports, you may need to purchase a separate USB-A to USB-C adapter or use a compatible hub.
What speed can I expect
It is rated up to 450MB/s read with USB 3.2. Real-world speeds can vary based on the device you plug it into and what you are transferring. Write speeds are often lower than read speeds.
Is 128GB capacity fully available
Not usually. Like other storage drives, the formatted capacity is typically lower than the labeled 128GB because operating systems measure gigabytes differently than manufacturers.
Will it work on USB 2.0 or USB 3.0 ports
It is intended to be backward-compatible with USB 3.0 and USB 2.0, which can reduce transfer speed compared with USB 3.2-capable connections.
Can it record 4K 60fps ProRes
It is positioned for 4K 60fps ProRes recording support in compatible workflows. Your success will depend on your recording app, device compatibility, and OTG storage support.
FAQs
Specifications
| Product Title | UnionSine USB C Flash Drive 128GB, USB3.2 Solid State External SSD Up to 450MB/s, Mini Type-C USB Drive SSD-Stick for iPhone 15/16/17 Series, Android Phone, Laptop, Tablet, TV, Car Audio |
|---|---|
| Category | Electronics > Computers & Accessories > Data Storage > External Solid State Drives |
| Brand | UnionSine |
| Manufacturer | UnionSine |
| Model Name | FD450-128GB |
| Model Number | FD450-128GB |
| Color | Grey |
| Digital Storage Capacity | 128 GB |
| Hard Disk Interface | USB 3.0 |
| Connectivity Technology | USB |
| Additional Features | Backward Compatible, Plug-and-Play, Portable |
| Hard Disk Form Factor | 2 Inches |
| Compatible Devices | Desktop, Laptop, Smartphone, Tablet, Television |
| Specific Uses For Product | Business, Gaming, Personal |
| Read Speed | 450 Megabytes Per Second |
| Data Transfer Rate | 450 Megabytes Per Second |
| Form Factor | 2.5-inch |
| Hardware Connectivity | USB 3.2 Gen 2 |
| Hard-Drive Size | 128 GB |
| Number of Items | 1 |
| Unit Count | 1.0 Count |
| Hard Disk Description | Solid State Hard Drive |
| Mfr Part Number | FD450-128GB |
| Warranty Description | 2 Years |
| Installation Type | External Hard Drive |
| Enclosure Material | Nand Flash |
| Special Feature | Backward Compatible, Plug-and-Play, Portable |
Available variants
Capacity
- 128GB
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