SanDisk Ultra SDXC UHS-I Memory Card 128GB
- Memory Storage Capacity: 128 GB
- Secure Digital Association Speed Class: Class 10
- Flash Memory Video Speed Class: U1
- Flash Memory Type: SDXC
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A high-capacity, fast-reading SDXC card well suited to Full HD shooting, though its U1 rating stops short of 4K-grade write speeds.
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ASIN: B07YFGG1SDModel: SDSDUNR-128G-GN6INCategory: SD Cards
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Overview
This SanDisk 128GB card belongs to the Ultra SDXC line, rated UHS Speed Class 1 with read speeds up to 100MB/s. It's built for compact to mid-range cameras and camcorders that need more room for Full HD video than a 16GB or 32GB card provides.
The 100MB/s read speed applies to the 64GB-256GB sizes; SanDisk lists the 32GB version of this line at 90MB/s, and write speed is called out separately as lower than the read figure. UHS Speed Class 1 supports real-time video recording rather than being just a marketing number, which matters for anyone recording continuously rather than shooting stills.
- 128GB SDXC capacity
- Read speeds up to 100MB/s
- UHS Speed Class 1, Class 10 rating
- Built for Full HD (1080p) video
Who it's for
Fits someone who wants a large-capacity card for a point-and-shoot camera or camcorder shooting a lot of Full HD footage or photos without swapping cards. Less suited to anyone shooting 4K, since this is a U1, not a V30 or U3, card.
Pros and cons
- 128GB holds far more photos and Full HD video
- Read speeds up to 100MB/s
- UHS Speed Class 1 supports real-time HD recording
- Write speeds are lower than the 100MB/s read spec
- U1 rating, not built for 4K (no V30/U3)
Performance notes
UHS Speed Class 1 is designed to support real-time video recording on UHS-enabled devices, paired with a Class 10 rating for Full HD (1080p) capture. Read speeds reach up to 100MB/s, though write speeds run lower and actual performance depends on the host device.
Specifications
| Brand | SanDisk |
|---|---|
| Model | SDSDUNR-128G-GN6IN |
| Dimensions & fit | |
| Item Weight | 0.02 pounds |
| Item Dimensions L X W | 1.3 × 0.9 inches |
| Capacity & performance | |
| Memory Storage Capacity | 128 GB |
| Secure Digital Association Speed Class | Class 10 |
| Flash Memory Video Speed Class | U1 |
| Media Speed | 90 MB/s |
| Construction & materials | |
| Color | Black |
| Compatibility & installation | |
| Hardware Connectivity | USB, MicroSDHC |
| Compatible Devices | Camera |
| Included components | |
| Number Of Packs | 1 |
| Unit Count | 1 |
| Warranty & support | |
| Warranty Description | 10 years |
| Warranty Type | Limited |
| Other details | |
| Flash Memory Type | SDXC |
| Number Of Items | 1 |
| Mfr Part Number | SDSDUNR-128G-GN6IN |
| Additional Features | Temperature Proof, Water Proof, X Ray Proof |
Frequently asked questions
How much storage does this SanDisk card have?
128GB, part of SanDisk's Ultra SDXC line spanning 32GB to 256GB.
Is it fast enough for 4K video?
It's rated UHS Speed Class 1 for Full HD recording, not a V30 or U3 card built for 4K.
What's the difference between its read and write speed?
SanDisk lists read speeds up to 100MB/s, but notes write speed is lower and actual performance depends on the host device.