You’ll soon be able to know if your microSD card is fast enough to run apps

Internal storage on a smartphone or tablet can quickly be used up by lots of apps, which is why having an microSD card slot for those devices is becoming more important. There are quite a few varieties of SD cards in the market and they come with various symbol on them that provide information such as their capacity (HC, XC) and speed class.

There’s now a new symbol, designed specifically to indicate running app performance. The new Application Performance Class logo will be used on microSD cards that offer minimum recommended random and sequential performance speeds to meet execution time requirements to run apps.



This week, the SD Association (the group that handles specifications for these cards), announced the Application Performance Class, which is designed to label SD and microSD cards that over solid performance for mobile apps.

Android 6.0 brought forth with it a feature that turns your adoptable storage to function as the internal storage of your device. Not all devices support this feature, but it’s quite common in mid-range and budget phones. The problem is that microSD cards are usually much slower than the internal NAND flash. The SD Specification 5.1 aims to fix that with introduction of App Performance Class 1.


Upon release, the SD Association has introduced the first and most basic App Performance level, which is App Performance Class 1, or A1. The SDA will introduce higher App Performance levels as market needs evolve. microSD memory cards that display the A1 symbol (pictured above) meet, or exceed, the following recommended speeds:

  • Random Read Input-Output access Per Second (IOPS) of 1500
  • Write IOPS of 500
  • Sustained Sequential performance of 10MB/s.

This week’s announcement will give consumers a heads up when buying sd cards, and also will give product manufacturers a way to communicate its app-running optimization before buying a microSD card. Those cards will likely be solid performers in Adoptable Storage situations.

Do you use your microSD card as an internal storage? How has your experience been?

Source : SD Association (Marketwired)

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