You always have that one friend who will boast about having got a memory card of a high capacity at a cost that is super-cheap in some deal. There is very high chance that, that memory card is of a lower 'Class' than the more expensive ones out there and it may not give him performance.
This post applies to all types of SD (Secure Digital) memory cards, be it micro-SD, mini-SD, SD, SDXC, SDHC and so on.
Now, the number written in circle, signifies the write speed of the memory card. For example, 4 means minimum 4 MBps writing speed will be ensured! It can go above that, and if it is so, it will be specified on the packaging. Higher the class, higher will be the cost of the memory card.
Question: But Nimish, how is this 'class' significant and how do I choose which class I need?
Answer: Here is a Wikipedia extract.
Source: Speed Class rating of Secure Digital(SD)
Write Speed Significance:
Like many reviews will tell you, if you have a DSLR that has a very high shutter speed, that is, it can capture photos very fast, then you will require a high performance memory card on which they can be quickly stored. Otherwise, your memory will become a limitation and you may not be able to choose a higher shutter speed. In such a case, you might have to choose a minimum class 6 or better yet, class 10.
UHS Speed may be required if you want to shoot 4K video with your camcorder.
Read Speed Significance:
If you have a performance demanding game installed on your Android smart-phone's micro-SD card, no matter how powerful the phone hardware is, your micro-SD card will become a limitation on performance if it does not offer high reading speeds.
For example, if you try to use a class 2 card for installing and playing something like Asphalt on a Galaxy Note II, it will definitely lag. But it will not lag if you use a class 6 or a class 10 card. Your general phone performance will also be affected depending on the class of the memory card, if you choose to install applications on the memory card.
So in conclusion, don't be fooled if someone offers a hard-to-believe dirt cheap price on a high capacity memory card and check the class rating on it first.
This post applies to all types of SD (Secure Digital) memory cards, be it micro-SD, mini-SD, SD, SDXC, SDHC and so on.
So to make it very simple:
Class = Speed and Performance
ALWAYS look out for 'class' logo while buying memory cards!
You will see these kind of logos on memory card which signify their class.
Here is an example of how cost differs with class.
Question: But Nimish, how is this 'class' significant and how do I choose which class I need?
Answer: Here is a Wikipedia extract.
Source: Speed Class rating of Secure Digital(SD)
Write Speed Significance:
Like many reviews will tell you, if you have a DSLR that has a very high shutter speed, that is, it can capture photos very fast, then you will require a high performance memory card on which they can be quickly stored. Otherwise, your memory will become a limitation and you may not be able to choose a higher shutter speed. In such a case, you might have to choose a minimum class 6 or better yet, class 10.
UHS Speed may be required if you want to shoot 4K video with your camcorder.
Read Speed Significance:
If you have a performance demanding game installed on your Android smart-phone's micro-SD card, no matter how powerful the phone hardware is, your micro-SD card will become a limitation on performance if it does not offer high reading speeds.
For example, if you try to use a class 2 card for installing and playing something like Asphalt on a Galaxy Note II, it will definitely lag. But it will not lag if you use a class 6 or a class 10 card. Your general phone performance will also be affected depending on the class of the memory card, if you choose to install applications on the memory card.
So in conclusion, don't be fooled if someone offers a hard-to-believe dirt cheap price on a high capacity memory card and check the class rating on it first.
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