all memory cards are divided into four classes, and are 2, 4, 6 or 10 th class.These figures are indicative of the minimum recording speed provided by this card.The values ​​defined in megabytes per second.Thus, the number 2 in a circle on the card means that the card belongs to the second class and has the lowest recording speed 2 MB / sec.This indicator is important for digital devices offering high speed recording or not having a very large clipboard.For these devices need a memory card of the corresponding class.
memory card of the second class are the cheapest, because they have the slowest writing speed.However, they are great for audio and video players, printers and photo frames.Do not use a memory card of the second class in camera and video recorder, as these devices are designed for the
active record.
fourth class card implies a minimum write speed of 4 MB / s, making it the best class for use in the non-professional cameras.Home shot - a perfect example of where this class is used.
Write Speed ​​6 MB / s makes the sixth-grade memory cards ideal for use in digital cameras average.These cards provide enough high-quality shooting in JPEG or RAW.
Tenth grade memory cards used to record the minimum skjrostyu 10 Mb / s and is designed to work with expensive professional photo and video cameras.Rather high price for memory cards tenth grade due to increased functionality of such cards:

- support of Full HD video recording;
- the ability to shoot in a format RAW;
- optional fast continuous shooting of high quality;
- memory, reaching up to 32 GB.

Of particular note is that the function does continuous shooting memory cards tenth grade essential for recording various sports competitions.