Can a memory card slow down a phone, camera or other device?
Can a memory card slow down a phone, camera or other device?
Yes, Memory Cards can slow down the performance of a phone, camera or other device, especially when their read and write speeds are too slow for the requirements of the hardware or application. In practice, this affects the time it takes to save photos, the smoothness of video recording and even the overall responsiveness of the system.
Memory Cards write and read speed - a key parameter
Memory Cards differ from one another speed classes, which define the minimum guaranteed data writing speed. The most important designations are Class 10, UHS (U1, U3), Video Speed Class (V10, V30, V60, V90) and Application Performance Class (A1, A2). Each of these classes indicates which applications the card is intended for. Using a card with a class that is too low in a device that generates large amounts of data (e.g. when recording video in 4K) will cause delays, stuttering or interrupted recording. This is because the memory buffer on the device fills up faster than the card can accept data.
Examples of the impact of a slow memory card on devices
In smartphones, the microSD card can act as internal memory. In such cases a card that is too slow slow slows down the launch of applications, the loading of photos and even the functioning of the system. In cameras, it can take longer to save RAW images, delaying the ability to take another shot. Car DVRs, on the other hand, can suffer from frame loss or recording errors if the card can't keep up with accepting data in real time. It is also worth remembering that even a theoretically fast card can slow down the device if it is heavily filled, logically damaged or comes from an unknown manufacturer and does not meet the declared parameters.
Choosing the right class of Memory Cards
Selecting a card that is too fast does no harm; the device will only use as much bandwidth as it can handle. However, using a card that is too slow will limit the performance of the equipment and may lead to problems with its use. This is particularly relevant for devices that record data in a continuous stream, sports cameras, drones, surveillance or smartphones with a large number of applications. An informed choice of Memory Cards is not only a question of capacity, but also of real performance, which has a direct impact on the comfort and reliability of the device.
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