UHS class
UHS bus version supported by the memory card.
UHS is a communication technology used in SD/microSD cards of the (micro)SD HC and (micro)SD XC standards. It allows you to significantly increase the speed of data exchange compared to previous standards; at the same time, media supporting this technology is quite compatible with equipment that does not have UHS — except that speeds in such cases will be limited by the capabilities of the card reader, and not by the card itself.
As for versions, their names consist of two parts: UHS generation (I or II) and class (1 or 3) — for example,
UHS-I Class 1. Actually, this is the most modest version of UHS found in modern memory cards; in addition to it,
UHS-I Class 3 and
UHS-II Class 3 are popular. The UHS generation determines the maximum data transfer rate (usually meaning read mode) — it is 104 MB / s for version I and 312 MB / s for version 2. “Class”, in turn, determines the lowest (guaranteed) write speed : it is at least 10 MB / s for Class 1 and at least 30 MB / s for Class 3. Different versions of UHS are quite compatible with each other, except that the speed in such cases will be limited by a slower standard.
Note that for UHS cards, other paragraphs may also indicate more advanced characteristics — for example, the video recording class (see below) V90 for a UHS-II Class 3 card. There are no
...contradictions here: the speed of 90 MB / s provided by such a card in write mode, fully satisfies the “at least 30 MB / s” condition provided for UHS Class 3.Video recording class
The video recording class supported by the memory card.
This parameter is specified for SD/microSD cards and their variations, as well as CompactFlash (see "Type"). In the first case, the V* format designation is used, in the second, VPG*, but the idea is the same there and there: the numbers indicated instead of an asterisk are the lowest write speed (in MB / s) that the card is guaranteed to provide. This speed is of key importance primarily in video shooting, which is why this parameter is called “Video Recording Class”; the higher it is, the higher the resolution and frame rate at which you can record using this card.
The minimum video recording class found in modern cards of the SD / microSD family is
V6, it already allows you to work with HD and Full HD video. However, for Full HD it is desirable to have a card of at least
V10 level. And the
V30 class already allows you to comfortably work with Ultra HD 4K. Faster cards are also being released — V60 and even V90, suitable already for 8K resolutions and higher.
In turn, in CompactFlash cards you can find models of classes
VPG20,
VPG65 and
VPG130
Note that the video recording class may well be higher than the general speed class and/or UHS class (see above). However, there are no
...contradictions here. The requirements for the UHS class provide a write speed "not lower than ..."; thus, for example, all cards with a video recording class of V30 and higher will comply with the UHS Class 3 standard (“at least 30 MB / s”). And the general speed class describes the card's capabilities when working with equipment without UHS support (and such equipment is practically not used in video recording).Speed value
Factor describing the maximum speed of the card in read mode. In this case, 150 KB / s is taken as a unit; thus, for example, a speed value of 533x corresponds to 150 * 533=79,950 KB / s, that is, about 80 MB / s.
In general, this parameter is quite specific; in fact, it is easier to focus on the directly claimed reading speed (see below). However, sometimes it is not indicated — in such cases, the speed value will be primarily useful.
Read speed
The maximum speed of reading data from a memory card.
Any modern memory card provides sufficient reading speed for simple everyday tasks — like copying photos from a camera to a laptop. Therefore, it makes sense to pay attention to this parameter mainly in cases where the card is purchased for professional use, or if high speed is critical for you — for example, if you often have to copy photos from the camera in a hurry. In doing so, two points should be taken into account. Firstly, the corresponding speed must be supported by the card reader where the card is used. Secondly, this paragraph indicates the theoretical maximum — in perfect conditions; the actual reading speed may be lower (if we are talking about cards with UHS, this speed can be estimated by the UHS class, see above about it). Nevertheless, it is quite possible to compare different models of cards by this indicator: differences in theoretical speed usually quite correspond to the difference in actual speed.
Write speed
The maximum speed for writing data to a memory card.
High write speed is important for tasks that involve storing large amounts of data in a limited amount of time. However, note that this paragraph indicates the theoretical maximum speed for perfect conditions; in fact, this value can be noticeably lower. Therefore, the characteristics of memory cards also indicate the minimum guaranteed write speeds in different modes — the general speed class, the UHS class, the video recording class and/or the class for applications. All of them are described in more detail above. However, you can also evaluate the capabilities of the carrier by the overall speed: other things being equal, a card with a higher theoretical speed will work faster in fact.
As for specific values, speeds
from 4 MB / s and
from 6 MB / s are practically not found nowadays,
from 10 MB / s and from
16 MB / s can be called average indicators,
from 50 MB / s — above average, and the fastest models have a maximum write speed of
100 Mbps or more.
/depending on configuration/
