SanDisk
SanDisk SDSQUAR-128G-GN6MN 128GB Ultra MicroSDXC Card Bundle
★★★★★
100MB/s read speeds and Class 10 U1 rating give Android devices reliable Full HD recording and fast app loading from 128GB of expandable storage.
$15.79*
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*Price sourced from Amazon.com. Last updated:Jun 04, 2026.Price and availability are subject to change.
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Overview
Key Features
Bundle includes (1) SanDisk 128GB microSD card and (1) Everything But Stromboli (TM) Micro Card Reader
Compatible with Samsung Galaxy Tab S4, J2 Pro, J7 Prime 2, A6, A6+, J6, J3, J4, J8 Cell Phones/tablets
Read speeds up to 100mb/s; rated A1 for faster app performance and UHS Speed Class U1 and Speed Class 10 for Full HD video recording and playback
Shockproof, temperature-proof, waterproof, and X-ray-proof
Ideal for Android-based tablets and smartphones for more expandable storage
Specifications
Brand
SanDisk
Model
SDSQUAR-128G-GN6MN
Capacity
128GB
Card Type
microSDXC
Read Speed
Up to 100MB/s
UHS Speed Class
U1
Speed Class
Class 10
Application Performance Class
A1
Durability
Shockproof, Waterproof, Temperature-proof, X-ray-proof
Bundle Includes
128GB microSD card + Everything But Stromboli card reader
Pros & Cons
👍 Pros
- 100MB/s rated read speed saturates Full HD video playback and delivers app load times meaningfully faster than Class 4 or Class 6 baseline cards
- A1 Application Performance rating specifies minimum random I/O benchmarks, ensuring consistent app responsiveness rather than just sequential throughput
- 128GB capacity on a single card eliminates the multi-card juggling that smaller-capacity options require on media-heavy devices
- Quad-proof durability (shock, temperature, water, X-ray) rated for the card's full service life — not just factory condition
- Bundle includes a card reader, removing the need to purchase a separate adapter for file transfer to desktop systems without a built-in slot
👎 Cons
- Write speed is unrated in the product specifications — real-world write performance in the 20–40MB/s range makes this unsuitable for 4K video recording or burst RAW shooting
- U1 speed class rating means this card does not meet the U3/V30 minimum required by cameras and devices that explicitly specify those classes for video recording modes
- The bundled card reader is an unbranded accessory — its USB generation and sustained transfer reliability are unknown, potentially bottlenecking file transfers
- microSDXC format is incompatible with older devices limited to microSDHC — compatibility must be verified before purchase
- No official write speed specification makes it impossible to objectively compare this card against competitors in write-intensive benchmarks
Frequently Asked Questions
What is the real-world write speed of this SanDisk Ultra 128GB card?
The listing specifies read speeds up to 100MB/s, but write speed is not rated in the product specifications. SanDisk Ultra cards in this class typically deliver write speeds in the 20–40MB/s range — adequate for Full HD video recording and app data, but not for burst RAW photography or 4K video, which demand faster U3/V30-rated cards.
What does the A1 rating mean and does it affect app performance?
A1 (Application Performance Class 1) is a standardized benchmark requiring a minimum of 1500 IOPS random read and 500 IOPS random write. In practice, this means apps installed to the card launch faster and run more responsively than on non-A1 cards, where random I/O can become a bottleneck during multitasking.
Is the included card reader USB 3.0 compatible?
The Everything But Stromboli card reader included in this bundle supports USB data transfer — verify the reader's USB generation spec before expecting maximum read throughput. The card itself reads at up to 100MB/s; a USB 2.0 reader will cap transfers at approximately 40MB/s regardless of the card's rated speed.
Does the waterproof and temperature-proof rating apply after the card has been used?
Yes — SanDisk's durability ratings (shockproof, waterproof, temperature-proof, X-ray-proof) are tested on production cards and apply throughout the product lifecycle, not just when new. These ratings are based on IEC standard testing and provide meaningful protection for cards carried in bags, pockets, or outdoor environments.
Is this card compatible with devices that only support microSDHC (not SDXC)?
No. The 128GB capacity requires the microSDXC format, which requires host device SDXC compatibility. Most Android smartphones and tablets manufactured after 2014 support SDXC. Check your device's specifications — older or budget devices may be limited to microSDHC (32GB maximum).
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