The minimum read performance is up by 2.7x, at the same time as providing 4x faster minimum write speeds. However, using IOPS to determine the speed is more reliable for measuring the type of tasks that apps undertake.įrom this diagram, and in reference to IOPS, it is clear to see that the A2 provides an extraordinary gain. The ‘IOPS’ in this diagram represents input-output access per second, a slightly unusual unit to what the speed of memory cards are usually measured in, which is typically in megabits or megabytes per second in accordance with how bitrates of a video are measured. Performance Specifications Chart – A1 vs A2 – a minimum IOPS level is important, which is covered by the A2 spec.Ĭarry on reading to take a look at a comparison of performance differences between the A1 and A2 rated memory cards. So, for apps that open multiple small files – high scores, different graphics for a single level, licensing permissions, etc. The higher the IOPS (Input/Output operations Per Second) the smaller files can be read and written to the card in any one time. Sequential read and write speeds are now joined in importance by random read/write speeds (measured in IOPS). So, now that slotted Android devices can store and run apps from removable cards, the SD Association has introduced a new specification to enable the best user experience – Application Speed Class 2 (A2).Īpplication Speed Class 2, defines the minimum specification for cards and host devices. The SD Association states, “The Application Performance Class was introduced to realize comfortable application manipulation such as compilation of data which is stored in an SD memory card.” Application Performance Class is one of these categories, developed to certify that microSD cards incorporated within Android’s storage capacity, could endure the performance needed to manage numerous applications from the microSD card directly. Simply put, there are different speed classes for microSD cards, dependent on how big of capacity your handling and what type of performance you require. Is the Application Performance Class Specification relevant to cameras?.
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