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 protection
The ability to switch the card to read-only mode, which allows you to protect important data from accidental overwriting or erasure. Usually implemented in the form of a mechanical slider switch, the position of which determines the card's operating mode. However, it is worth considering that this slider is only an indicator that signals the card reader about the selected mode, and its position does not affect the card itself; in some card readers,
the write protection function may simply be absent - such devices will not "see" the position of the slider.
