Transcend
Transcend 128GB USD300S microSD UHS-I Card, 100MB/s, 4K, U3, V30, A1
Bottom line: The Transcend 128GB USD300S microSD UHS-I Card ($34.99 on Amazon as of 2026-11-07 17:13 UTC): 100MB/s read, 35MB/s write for fast game and file transfers; main trade-off: 35MB/s write is slow for large game installs or bulk 4K offloads.
As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →
*Price sourced from Amazon.com. Last updated 2026-11-07. Price and availability subject to change.
Pros & Cons
Pros
- ✓ 100MB/s read, 35MB/s write for fast game and file transfers
- ✓ A1 rated: 1500 IOPS random read, 500 IOPS random write for app launches
- ✓ V30 class guarantees 30MB/s sustained write for 4K UHD capture
- ✓ Works across Switch, Steam Deck, ROG Ally, Legion Go and MSI Claw
Cons
- ✗ 35MB/s write is slow for large game installs or bulk 4K offloads
- ✗ 128GB fills fast with modern 30-50GB handheld titles
- ✗ V30 only, so it misses the V60/V90 tier some cinema cameras want
- ✗ UHS-I caps bandwidth well below UHS-II cards in compatible readers
Manufacturer description
Ultra-Fast Read & Write Speeds : Read speed up to 100MB/s, write speed up to 35MB/s, ensuring smooth 4K UHD video recording and high-speed data transfer Perfect for Gaming Consoles & Various Devices : Compatible with Nintendo Switch, Steam Deck, ROG Ally, Legion Go, Android tablets, drones, action cameras, DSLRs, and 4K camcorders, meeting a wide range of storage needs Expand Storage with Ease : Instantly adds extra storage to smartphones, tablets, and laptops, allowing seamless storage of apps, games, videos, and high-resolution photos, enhancing user experience
SpecPicks Verdict
SpecPicks scored Transcend 128GB USD300S microSD UHS-I Card using a rating × review-volume × price-fit model applied to published specs and reviews across the handheld consoles category. Transcend's handheld consoles lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for handheld consoles of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Frequently Asked Questions
Does this microSD card work with the Nintendo Switch?
Yes. Transcend lists Nintendo Switch compatibility directly, along with Steam Deck, ROG Ally, Legion Go, and MSI Claw handhelds.
How fast is the Transcend 128GB microSDXC card?
Read speeds reach up to 100MB/s and write speeds up to 35MB/s. The V30 rating guarantees a minimum sustained write of 30MB/s.
Can it record 4K video without dropping frames?
Yes. The V30 Video Speed Class guarantees 30MB/s sustained write, the floor 4K UHD and Full HD recording needs to avoid interruptions.
What does the A1 rating mean for gaming and apps?
A1 certifies 1500 IOPS random read and 500 IOPS random write, the random-access speed that governs how quickly apps and games load.
Key Features
- Ultra-Fast Read & Write Speeds : Read speed up to 100MB/s, write speed up to 35MB/s, ensuring smooth 4K UHD video recording and high-speed data transfer
- Perfect for Gaming Consoles & Various Devices : Compatible with Nintendo Switch, Steam Deck, ROG Ally, Legion Go, Android tablets, drones, action cameras, DSLRs, and 4K camcorders, meeting a wide range of storage needs
- Expand Storage with Ease : Instantly adds extra storage to smartphones, tablets, and laptops, allowing seamless storage of apps, games, videos, and high-resolution photos, enhancing user experience
- Seamless 4K Video Recording : With V30 Video Speed Class, guaranteeing a minimum sustained write speed of 30MB/s, perfect for 4K UHD and Full HD video recording, preventing dropped frames or interruptions
- Enhanced Mobile & App Performance : Features A1 rating, providing 1500 IOPS random read / 500 IOPS random write, optimizing app launch speeds and multitasking performance
Full Specifications
| Size | 128 GB |
|---|---|
| Brand | Transcend |
| Color | 128GB |
| Model | TS128GUSD300S |
| Warranty | 5 Year Warranty |
| UnitCount | 1 |
| ReleaseDate | 2018-11-30T00:00:01Z |
| Manufacturer | Transcend Information |
| IsAdultProduct | false |
| ItemPartNumber | TS128GUSD300S |
Hardware benchmark data
Ready to buy?
Transcend 128GB USD300S microSD UHS-I Card, 100MB/s, 4K, U3, V30, A1 is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-11-07. Price and availability subject to change.
Read our analysis
SpecPicks coverage that features this Handheld Console.
Related Handheld Consoles
More guides & deep dives from the SpecPicks archive
Browse all articles & guides →- Emulation Hardware in 2026: FPGA, Software, and Cart-Reader Ecosystems
- How to Build a Windows 98 Retro PC in 2026
- Best Budget Gaming PC Build 2026 — ~$1,000 Parts List
- Best Retro Handhelds in 2026 — From $35 to $500
- The Complete Voodoo5 5500 AGP Driver Guide (2026 Edition)
- RTX 4070 Super vs RX 7800 XT — Which to Buy in 2026
- Best 1440p Gaming GPUs in 2026
More reviews from the SpecPicks archive
Browse all reviews →- Why Preassembled PCs Beat DIY Builds in 2026
- Best Controller for Retro Emulation on PC: 8BitDo, GameSir, DualSense
- ComfyUI for NVIDIA Cosmos 3 on an RTX 3060 12GB: Setup + Limits
- NEEWER 18" vs UBeesize 22" Ring Light for Webcam Streaming (2026)
- Is the KOORUI 27-inch 4K Mini-LED a Real Upgrade for Console Gaming?
- Step 3.7 Flash vs Gemma 4 12B: Which Local Model Wins on a 12GB GPU?
- GameNative Unlocks Up to 100 FPS PC Gaming on Android
- Gemini-Class Models on Local Hardware: How Much VRAM You Actually Need
- Best CPU Cooler for Ryzen 9 3900X Overclocking in 2026
- IBM Granite 4.1 8B vs Qwen 3.6 27B: Which Small Local Model Wins on a 16GB GPU?
- Qwen3.6-27B vs Coder-Next: Local Code Accuracy and VRAM on AMD Rigs
- RTX 3060 12GB vs RTX 3090 for Local LLMs (2026)
- Glide vs OpenGL vs Direct3D: The PC Gaming API War 1996-2003, Benchmarked
- That Game Boy Clone Runs Too Fast — and the Fix Is a Clock Crystal
- Grok Imagine 1.5 Shipped 720p Video — Run Local Image/Video Gen Instead
- Handheld Gaming PC Sale: Best 2026 Deals to Buy Now
- How to run Llama 3.1 8B on NVIDIA GeForce RTX 5080
- RTX 3060 12GB vs Ryzen 5 5600G iGPU: Do You Need a GPU for 1080p Esports?
- $1,000 Gaming PC Build 2026: Parts, Cost, 1080p FPS
- Gaming PC Build 2026: The Reddit-Consensus Parts List
- Ryzen 5 2600 vs Ryzen 9 3900X: Do 12 Cores Buy CPU-Only 8B Inference?
- Microsoft Signals 32GB RAM as the Windows 11 Gaming Baseline
- Best Parts for a Budget Ryzen + RTX 3060 Gaming PC Build in 2026
- Intel Core Ultra 5 250K Plus vs Ryzen 5 7600X3D: The Mid-Range Faceoff
Earliest SpecPicks reviews
Browse full archive →- Best GPU for Llama 3.1 8B (2026)
- Best GPU for Qwen 3 14B (2026)
- Best GPU for Qwen 3 32B (2026)
- Best GPU for Llama 3.1 70B (2026)
- Best GPU for DeepSeek-R1 32B (2026)
- Best GPU for Llama 3.1 405B (2026)
- How to run Llama 3.1 8B on NVIDIA GeForce RTX 5090
- How to run Qwen 3 14B on NVIDIA GeForce RTX 5090
- How to run Qwen 3 32B on NVIDIA GeForce RTX 5090
- How to run Llama 3.1 70B on NVIDIA GeForce RTX 5090
- How to run DeepSeek-R1 32B on NVIDIA GeForce RTX 5090
- How to run Llama 3.1 8B on NVIDIA GeForce RTX 4090