SanDisk SDSDQM-0128G 64GB Ultra MicroSD Card Adapter — main product image

SanDisk SDSDQM-0128G 64GB Ultra MicroSD Card Adapter

SanDisk

SanDisk SDSDQM-0128G 64GB Ultra MicroSD Card Adapter

Name: SanDisk SDSDQM-0128G 64GB Ultra MicroSD Card Adapter
Brand: SanDisk
SKU: SDSDQM-0128G-B35A

★★★★★4.5 (113 reviews)

Up to 100MB/s UHS-I read speed and A1 app performance in 64GB — the SanDisk Ultra delivers the speed class that separates it from legacy Class 10 cards for 1080p and mobile storage.

$12.95*$27.88Save 53%

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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The SanDisk Ultra 64GB microSDXC is a UHS-I, Class 10, U1, A1-rated card delivering up to 100MB/s sequential read — the practical ceiling for the UHS-I single-lane interface. That speed class means large file transfers to a USB 3.0 reader complete significantly faster than older Class 10 cards without UHS-I signaling, and the A1 certification adds a specified random I/O floor of 1500 IOPS read that prevents the card from stalling Android app launches when it's used as expandable storage. The 64GB capacity provides meaningful headroom for photo libraries, video clips, and app installations across the devices this card is designed for.

This card sits in the utility tier of SanDisk's microSD lineup — positioned above the basic Class 10 without UHS-I signaling, and below the Extreme and Extreme Pro series that carry V30 certification and higher write speed guarantees for 4K video workflows. It's the right match for Full HD 1080p recording in dashcams and action cameras, Android tablet storage expansion, and photo backup duty in entry-level mirrorless or DSLR bodies. The bundled SD adapter extends its reach to any full-size SD slot. Users who need V30-certified sustained write performance for 4K recording or A2-rated random I/O for intensive app use should step to the Extreme line — for the workloads this card targets, it delivers consistent, reliable performance.

Key Features

Brand New in box. The product ships with all relevant accessories

Specifications

Storage Capacity

64GB

Card Type

MicroSD

Included Accessory

SD Card Adapter

Pros & Cons

👍 Pros

Up to 100MB/s sequential read speed saturates the UHS-I bus, producing file transfer speeds to a USB 3.0 card reader that are noticeably faster than non-UHS Class 10 cards at the same capacity.
A1 application performance class rating meets the minimum random IOPS specification for running Android apps from expandable storage without the lag that unrated microSD cards introduce.
64GB capacity provides storage headroom for several thousand JPEG photos, hours of 1080p video, or a substantial Android app library before a transfer or card swap is needed.
Included full-size SD adapter adds compatibility with DSLR cameras, laptops, and card readers that lack a dedicated microSD slot, broadening device compatibility beyond microSD-only use.
U1 minimum write speed guarantee ensures reliable 1080p video recording without dropped frames on devices that support UHS-I signaling.

👎 Cons

U1 speed class does not meet the V30 minimum write specification required for reliable 4K video recording on camera bodies and action cameras that require guaranteed 30MB/s sustained write.
No UHS-II support means the card cannot benefit from the dual-row high-speed interface available on high-end cameras and card readers designed for UHS-II throughput.
A1 random I/O specifications fall below the A2 rating that newer Android devices and more demanding app installations benefit from, particularly for write-intensive app operations.
Maximum write speed is not specified on the product — the 100MB/s figure is read-only, and sequential write performance on this product class is typically a fraction of the rated read speed.
The included SD adapter introduces an additional contact interface that can cause intermittent read errors if the adapter is not fully seated or develops debris on the contact pads over time.

Frequently Asked Questions

What speed class ratings does this card carry, and what do they mean for recording and app use?

This SanDisk Ultra carries UHS Speed Class 1 (U1), Class 10, and Application Performance Class A1 ratings. U1 guarantees a 10MB/s minimum write speed — the threshold for reliable Full HD 1080p video recording. A1 specifies a minimum of 1500 IOPS random read and 500 IOPS random write, which is the floor for running Android applications from the card without UI stutter.

Does this SanDisk Ultra 64GB include a full-size SD adapter?

Yes — the card ships with a standard SD adapter, extending compatibility to cameras, laptops, and any device using a full-size SD card slot in addition to microSD slots.

What is the maximum sequential read speed, and when does it matter?

The card is rated at up to 100MB/s sequential read, which saturates the UHS-I single-lane bus. That speed is most relevant when transferring large photo or video files to a USB 3.0 card reader on a desktop or laptop — transferring a 4GB video file takes under a minute rather than several.

Is this card backward compatible with devices that require older Class 4 or Class 6 ratings?

Yes — U1/A1/Class 10 cards are fully backward compatible with devices specifying Class 4 or Class 6 minimums. The card communicates at whatever speed the host device supports, down to standard SD timing if the device doesn't support UHS-I signaling.

Can this card reliably record 4K video?

No — the U1 rating guarantees 10MB/s minimum write speed, which covers Full HD 1080p recording. Continuous 4K video recording typically requires V30 certification (30MB/s minimum write) or better. This card does not carry a V30 rating and should not be relied upon for 4K recording applications.