SanDisk 128GB micro SD SDXC Card 100MB/s Ultra 128G Class 10 UHS-1 A1 For Sale

The SanDisk 128GB Ultra microSDXC card is a storage solution that strikes a careful balance between capacity, speed, and value. Positioned as an everyday performer for Android smartphones, tablets, Chromebooks, and compact cameras, it offers enough room for extensive media libraries while delivering transfer speeds that make moving files quick and painless. This card represents the middle tier of SanDisk\'s consumer microSD lineup—faster and more feature-rich than basic cards, yet more affordable than the high-end Extreme series designed for professional 4K video work.

The 128GB capacity sits in a practical sweet spot for mobile storage expansion. Unlike smaller cards that fill up after a few hundred photos or a couple of hours of video, this card provides enough space to function as a genuine secondary drive for a smartphone or tablet. Users can store thousands of high-resolution photos, many hours of Full HD video, and still have room left for music libraries, documents, and apps . For devices where internal storage is limited and non-expandable, this card can effectively double or even triple the available space, eliminating the constant need to offload content to cloud services or delete files to free up room.

The SanDisk Ultra 128GB card delivers read speeds of up to 120MB/s, a figure that allows for rapid file transfers when paired with a compatible USB 3.0 reader . To contextualize this performance: SanDisk states that at this speed, users can move up to 1,000 photos in a single minute under optimal conditions . While write speeds are notably lower than read speeds—a standard characteristic across consumer memory cards—the card still maintains sufficient write performance for its intended use cases, including Full HD video recording and burst photography.

The card carries the Class 10 speed rating, which guarantees a minimum sustained write speed of 10MB/s, ensuring that Full HD (1920x1080) video recording proceeds without dropped frames or stuttering . The UHS-I interface provides the underlying bus architecture, with SanDisk employing proprietary technology to push read speeds beyond the standard UHS-I ceiling of 104MB/s to reach the advertised 120MB/s . It is worth noting that achieving these maximum speeds requires a host device and card reader capable of supporting them; on devices with slower interfaces, the card will operate at the device\'s maximum supported speed.

The A1 (App Performance Class 1) certification is particularly significant for users who plan to store and run applications directly from the card . This rating guarantees a minimum of 1,500 random read IOPS and 500 random write IOPS, translating to faster app launch times and smoother operation when executing programs stored on the card . For Android users who employ adoptable storage or simply choose to move apps to external memory, the A1 rating helps minimize the performance penalty that slower cards impose on app responsiveness. While A1 is not the highest app performance tier—A2 offers higher IOPS guarantees—it represents a meaningful upgrade over cards lacking any app performance certification.

SanDisk has engineered this card to withstand the rigors of daily use in portable devices. The card is rated as waterproof, temperature-proof, X-ray-proof, magnet-proof, and shock-proof . These protections cover a wide range of potential hazards: accidental spills or immersion in water, exposure to temperature extremes, the X-ray scanners at airport security checkpoints, close proximity to magnets in bags or cases, and the inevitable drops and impacts that portable electronics endure. The operating temperature range spans from -25°C to 85°C, while storage temperatures can safely extend from -40°C to 85°C . This durability makes the card suitable for use in action cameras, outdoor photography, and travel scenarios where devices are exposed to unpredictable conditions.