MSD-A1 Series

MSD-A1 Series

A1/UHS-I UHS Speed Class 1-ready microSD memory card

MSD-A1 Series

  • 32GB
  • 64GB
  • 128GB
  • microSDXC/Application Performance Class 1 (A1)
  • X-Ray Proof/Water Proof IPX7/Android Smartphone/Nintendo Switch

Apps work with ease! Supports A1
Best microSD card for smartphones and gaming equipment

The microSD card conforms to Application Performance Class 1 (A1), the speed standard for smartphone apps. When used as a built-in memory for smartphones, the smartphone app startup time and photo apps' reading speed stabilize, making the use of smartphones a breeze.


Saves apps work with ease

  • Android Smartphone
  • Compatible with Nintendo SWITCH*
  • X-Ray Proof
  • Waterproof

*Independently verified by our company. Please refrain from contacting the manufacturer.

Apps work with ease – Conforms to the new A1 standard

Application Performance Class 1 (A1)

Application Performance Class 1 (A1)

This product conforms to Application Performance Class 1 (A1), the speed standards for smartphone apps specified in SD Specifications 5.1 by the SD Association, an organization that sets the standards for memory cards, which serve as the industry's guidelines.
The A1 standards state that an SD card must provide a random read speed over 1500 IOPS, a random write speed over 500 IOPS, and a sustained sequential write speed of at least 10 MB/s.
As a result, the speed of starting up smartphone apps and reading data with a photo app is stabilized, making the use of smartphones more comfortable.

Transfer at a speed of up to 104 MB/s! Supports UHS Speed Class

Compatible with UHS-I, an interface that achieves high-speed, stable transfer. It can read and write at a speed of up to 104 MB/s (standard rate) and meet the need for handling large volumes at high speed. It is also UHS Speed Class 1-ready, guaranteeing a transfer speed of 10MB/s for UHS compatible devices.

What’s a UHS-I?


25 MB/s is the maximum transfer speed supported by SD speed classes such as Class 10. Ultra High Speed = UHS-I is a standard that supports transfers at a higher speed. As a standard rate, UHS-I achieves a high-speed transfer of up to 104 MB/s.
Although a UHS-I interface memory card can work with non-compatible devices, it performs best when used with UHS-I interface compatible devices.

Supports UHS Speed Class 1

Among the UHS-I standards, it supports Speed Class 1. It also supports Class 10, with both guaranteeing a transfer speed of 10 MB/s.

  Class Minimum speed during
continuous data writing
SD bus mode Application
UHS Speed Class 3 30 MB/s UHS-II
4K/Full HD (2K) video recording
1 10 MB/s Full HD (2K) video recording
Speed Class 10 10 MB/s High-speed(HS) Full HD (2K) video recording
6 6 MB/s Default speed(DS) Full HD (2K)/HD video recording
4 4 MB/s
2 2 MB/s SD video recording

Boost your smartphone/tablet storage capacity!

Boost your smartphone/tablet storage capacity!

It can be used by inserting it in the card slot of microSDHC and microSDXC-ready Android, smartphones, and tablets. It can save plenty of image, music, and video files that can take up space on your smartphone.

Compatible with Nintendo Switch™

It is compatible with Nintendo Switch™.
It can expand the storage capacity when saving downloaded files and screenshots.

Compatible with Nintendo SWITCH*

Other handy functions

It will not be affected by X-Ray hand baggage scanning at airports.

It conforms to the international ISO7816-1 standard.
Saved data will not be affected by X-Ray scanning at airports.

It will not be affected by X-Ray hand baggage scanning at airports.

Waterproof means peace of mind if it gets wet.

The microSD card is waterproof (IPX7, 1 meter).
*The card only. Use a dry cloth to wipe away moisture and dry the card before use.

Waterproof means peace of mind if it gets wet.


Compatible models

  • microSDHC and microSDXC-ready devices.
  • Nintendo Switch™

Limits to supporting models

32GB model

*It can only be used with microSDHC devices and those specified in the manual. Since it is incompatible with conventional microSD, it cannot be used with devices that only support microSD memory cards.


64GB/128GB model

*It can only be used with devices bearing the microSDXC logo and those specified in the manual. Since it is incompatible with conventional microSD and microSDHC, it cannot be used with devices that only support microSD and microSDHC memory cards.


microSD card-supporting equipment

microSD, microSDHC, and microSDXC memory cards are incompatible with lower standards. Please refer to the table below for devices that can be used.

  microSD card This product
microSDHC cards
This product
microSDXC cards
microSD-supporting device OK No No
microSDHC-supporting device OK OK No
microSDXC-supporting device OK OK OK


Model number MSD-A1-32G MSD-A1-64G MSD-A1-128G
Capacity 32GB 64GB 128GB
microSD/SD card standard microSDHC microSDXC
Model type UHS-I
UHS Speed Class Speed Class 1
SD Speed Class Class 10
Performance Class
Application Performance Class 1 (A1)
External dimensions 11.0 (W) ×15.0 (D) ×1.0 (H) mm, SD Card adapter : 24.0 (W) x 32.0 (D) x 2.1 (H) mm
Mass Approximately 0.25 g
Mass (packaged) Approximately 11 g
Source voltage 2.7 to 3.6 V
Operating temperature range 0 to 55℃
Operating humidity limits 20 to 80%(no condensation)
Warranty period Hardware warranty (two year)
Compliant standards SD Memory Card Specification Ver5.10 compliant
Various certifications obtained RoHS Directive (10 substances), WEEE Directive, CE, and REACH Regulation compliant.
Notes Waterproof performance* JIS IPX7 class
Accessories SD Card adapter

*This product has undergone the JIS IPX7 Class test (formerly the JIS Protection Grade 7 Immersion test) and was verified to seal out water when gently submerged in room temperature tap water at a depth of one meter for thirty minutes (based on our study). Although this product is waterproof at the time of shipment, we cannot guarantee that it will retain its waterproof performance due to age deterioration and other external factors. Do not intentionally immerse this product in liquid. Wipe away any moisture with a dry cloth before using.

Disposal Information
  • For Users of Waste Electrical & Electronic Equipment (Europe only)
    This symbol on the product means that it is a piece of electrical and electronic equipment that
    should not be mixed with general household waste.
    The correct disposal will help prevent potential negative effects on human health and the environment. For the proper handling, recovery and recycling of used products, please take them to applicable collection points, according to your national laws. For more information about the collection and recycling of used products, please get in touch with your local authority, your waste disposal service, or the original vendor.
    This symbol is relevant to the directive 2006/66/EC Article 20 Information for end-users and Annex II. (EU countries only) The symbol means that batteries and accumulators should be disposed of separately from your household waste at their end-of-life. If a chemical symbol is printed beneath the symbol shown above, it means that the battery or accumulator contains a heavy metal at a certain concentration. They are as shown below.

    Hg: mercury (0.0005%), Cd: cadmium (0.002%) and Pb: lead (0.004%) These substances may cause serious damage to humans and the global environment. In the European Union, there are separate collection systems for used batteries and accumulators. Please dispose of batteries and accumulators correctly at your local community waste collection/recycling centre.

  • In other Countries outside the European Union This symbol is only valid in the European Union. If you wish to discard these items, please contact your local authority or dealer and ask for the correct method of disposal.


We declare under our sole responsibility that the product:

Product Name
microSD Memory Card
Model Number
MSD-A1-32G. MSD-A1-64G, MSD-A1-128G
Brand Name

to which this declaration relates, is in conformity with the protection requirements of the following Council Directives:

Directive 2014/30/EU
Directive 2011/65/EU

The mentioned device has been successfully tested against the following standards:

  • EN 62479:2010
  • EN 55032:2012/AC2013
  • EN 55024:2010
  • EN 63000-1:2018

Authorised representative in Europe

Av. Siglo XXI, 34 - 08840, Viladecans, Barcelona, Spain

EU Representative


Av. Siglo XXI, 34 - 08840, Viladecans, Barcelona, Spain
+34 936546120
+34 936542176



3-10 Sakurada-machi, Kanazawa-shi, Ishikawa-ken, Japan 920-8512