The application speed class that the memory card corresponds to.
When working with applications that use a memory card (for example, mobile games), information is written and read not in a continuous stream, as when recording video or copying data, but in separate small fragments, moreover, from random sections in the memory of the drive (the so-called random write / read). So a high video recording class (see above) does not always mean good performance when working with demanding games and other resource-intensive programs. Therefore, in the characteristics of memory cards, they began to separately indicate the speed class for applications.
The key indicator for assigning one or another class is the minimum number of IOPS (input / output operations per second) that the media can provide in random write and read mode. The following classes are relevant today:
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A1 — at least 1500 IOPS for reading and 500 IOPS for writing;
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A2 — at least 4000 IOPS and 2000 IOPS, respectively.
The speed of continuous recording (for example, when shooting video) in both cases must be at least 10 MB / s (often it turns out to be even more — see “Speed class”, “Video recording class”).
In the future, we can expect the appearance of new, more performant classes for applications. Also note that this parameter significantly affects the price of the card.
Manufacturer's warranty provided for this model.
In fact, this is the minimum service life promised by the manufacturer, subject to the rules of operation. Most often, the actual service life of the device is much longer than the guaranteed one. But an indicator of 5 years suggests that the memory card is more likely to be lost or become irrelevant. You can also come across
a lifetime warranty, but in this case it is better to clarify the details of what it applies to. And in any case, it implies a certain period of time, though measured in decades. In addition to confirmation of reliability, such a guarantee allows you to contact the supplier after a while to eliminate possible problems (of course, not mechanical). But the difficulties in implementing this procedure (the representative office is located only in large cities) and the rare cases of the need for this (after all, it is easier to buy a new flash drive, with the exception of vital information on the old media) make the lifetime warranty more of a marketing ploy than a cool chip.
/depending on configuration/
