What is the difference between class two&class four micro sd cards?

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Different SD cards have the same general shape and size, making it is hard to tell the difference between one and the other unless you look closely. SD cards have different speed classes. SD cards are labeled as Class 2, Class 4, Class 6 and Class 10.

Speed Class

Speed class determines the transfer speed for each variety of card. Transfer speed refers to the amount of information that can be transferred to the card in a single second, analogous to the miles-per-gallon for a car.

Difference Between Each Class

The Class 2 is the slowest speed class with a minimum transfer speed of 2 mega bytes per second. The Class 4 is twice as fast with a minimum transfer speed of 4 mega bytes per second.

Different Transfer Speeds

Depending on the kind of information you will be transferring you may want a faster card. If you have a digital camera and you want to use the burst mode feature, which allows you to shoot a rapid series of continuous shots, a higher-class SD card can allow you to shoot longer while in this mode.

Class and Speed

Class number does not necessarily determine the speed. The class number determines the minimum transfer rate that an SD card is capable of. The SD class system is managed by the SD Card Association who provide performance testing to manufacturers who want to have the logo and speed certifications on their SD cards. However, SD cards tend to under- and over-perform depending on the manufacturer. Class 6 cards have been found with transfer rates between 3.6 mega bytes per second and 18.5 mega bytes per second.

Higher Class SD Card

Primarily, higher speed SD cards are good when dealing with higher quantities of information, such as high-resolution photos or video. Higher Class SD cards are also helpful when it comes to transferring information from the SD card to the computer because they reduce the transfer time.

Source:

CNet:SD Cards Hit Class 10

http://robgalbraith.com/bins/camera_multi_page.asp?cid=6007-9597">SDCard.org:Speed Class

Digital Photography Insights:Speed Transfer Rates

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What is the difference between class two&class four micro sd cards?

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