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Small rectangular SDXC card with gold contacts and SanDisk Ultra label

SanDisk

SanDisk SDSDUNR-128G-GN6IN CYU 128GB SDXC memory card

SKU CH-2K7B-06RYB

A full-size SDXC card holding 128GB with Class 10 speed and up to 100MB/s read performance

  • Total capacity128 GB
  • Memory card formatFull Size SD
  • Speed classClass 10
  • Product typeSecure Digital Extended Capacity (SDXC)
  • 128 GB capacity stores thousands of photos and videos
  • Class 10 rating guarantees minimum 10 MB/s sustained write speed
  • UHS-I interface delivers up to 100 MB/s read performance
  • Full-size SD form factor fits standard camera and laptop slots
  • Built-in write-protect switch prevents accidental data loss

Capacity and card type

This SanDisk SDXC card provides 128GB of storage in the full-size SD form factor. It is suited for photographers and videographers who need reliable capacity for high-resolution images and Full HD video. The Class 10 rating guarantees a minimum sustained write speed of 10MB/s for continuous recording. It fits any device with a standard SDXC slot.

Thermals and power draw

Solid-state construction means there are no moving parts to generate heat or noise during operation. The card draws minimal power from the host device, helping to conserve battery life in cameras and camcorders. A mechanical write-protect switch on the casing prevents accidental data loss without requiring software intervention. Normal use stays cool and silent.

Sustained load behaviour

The UHS-I U1 interface supports read speeds up to 100MB/s for fast offloading of large files to a computer. Class 10 performance is maintained during extended bursts of stills or lengthy video clips without speed drops. Non-volatile memory retains data safely when the card is removed or the device loses power. It handles prolonged write sessions reliably.

How it compares

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

Price $11.99
Cheaper than about 92% 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 $93.67 per TB
Cheaper than about 96% of the 901 comparable items (median $374.69 per TB).

Specifications

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

Questions about this item

How do I insert this 128GB SDXC card and which way does the write-protect switch need to face?

Slide the card label-side up into the full-size SD slot until it clicks; the write-protect switch on the left edge must stay toward the contacts or the card will be read-only.

What part of this Class 10 UHS-I card wears out first and when should I plan to replace it?

The NAND flash cells degrade with each erase cycle; replace the card if write speeds drop noticeably or if files become unreadable after heavy use.

At what sustained write speed will this 100MB/s-rated card hit its limit during long video recording?

The U1 rating guarantees a minimum 10MB/s sequential write, so extended 4K or high-bitrate streams may stall once that floor is reached.

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