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Blue rectangular SD card with SanDisk label and 128GB marking

SanDisk

SanDisk SDSDUNC-128G CYU 128GB SDXC Class 10 U1 80MB/s memory card

SKU CH-Z6GV-AKYEY

Full-size SDXC card holding 128 GB with Class 10 and U1 ratings for 80 MB/s read speeds

  • Total capacity128 GB
  • Memory card formatFull Size SD
  • Speed classClass 10
  • Product typeSecure Digital High-Capacity (SDHC)
  • 128 GB capacity stores thousands of photos
  • Class 10 rating guarantees 10 MB/s minimum write speed
  • 80 MB/s read speed accelerates file transfers
  • UHS-I U1 supports smooth Full HD video recording
  • Standard full-size SD fits most cameras and laptops

128GB SDXC card for portable devices

This SanDisk SDXC card provides 128GB of storage in a full-size Secure Digital form factor. It is suited to compact portable devices that require high-capacity flash memory in a small footprint. The card uses non-volatile solid-state technology with no moving parts to help conserve battery power. It targets users of digital cameras, camcorders, smartphones and similar handheld equipment.

Sustained write performance at Class 10

The card carries a Class 10 speed rating, guaranteeing a minimum sequential write speed of 10MB/s during continuous operation. This sustained throughput supports steady recording tasks such as Full HD video capture without frame drops. Read speeds can reach up to 80MB/s for faster file transfers to a host system. The 533x rating reflects this peak read capability rather than a sustained write figure.

Check host compatibility and write protection

Verify that your device accepts SDXC cards and supports the UHS-I U1 interface before ordering. The card includes a mechanical write-protect switch on its casing that must be positioned correctly for recording. Ensure the host's card slot accommodates full-size SD media rather than microSD only. No specific speed standard beyond Class 10 and U1 is declared for this model.

How it compares

Measured against everything we stock in SD & MicroSD Memory Cards, at today’s prices. Recalculated every night.

Price $31.99
Cheaper than about 63% of the 1,947 comparable items (median $46.99).
Total capacity 128 GB
Higher than about 60% of the 1,132 comparable items (median 64 GB).
Price per TB $249.92 per TB
Cheaper than about 70% of the 901 comparable items (median $374.69 per TB).

Specifications

Product
Brand nameSanDisk
Total capacity128 GB
Product typeSecure Digital High-Capacity (SDHC)
Performance
Speed classClass 10
Storage
Memory card formatFull Size SD

Questions about this item

Does the 80MB/s read speed generate noticeable heat during all-day video recording?

The card has no moving parts and uses non-volatile solid-state memory, so it runs cool even during extended use.

What host device slot is required for this full-size SDXC card to function?

It needs a standard SDXC-compatible slot that supports UHS-I and the 128GB capacity.

Will the Class 10 and U1 ratings work reliably in an older camera that only specifies Class 6?

Yes, the card is backward compatible with devices that accept lower speed classes such as Class 6.

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