SD-CARDS.NET

There are some standards involved to measure the card speed. SD card speed is measured as ‘x’ factor like 20x or 100x. The x is how much data can a SD card can read or write in 1 second. The SD card which has more write speed or greater x is faster than the less x or write speed. There is a base line which is equal to 150KB per second which a card can write data. Here is the simple formula to calculate the actual speed of your SD card.

• 1x * 150KB/s
• For example: 5 * 150 = 750KB per second

As the theory says faster cards with high x with them can write or even read data fast per second. But for some digital devices it doesn’t matter whether the card is fast or not as this is more happened in digital cameras. Some devices like digital cameras can’t capture and write the picture or video date immediately on the SD card. These cameras are designed to first store this date to their SD which is called a buffer than slowly camera transfers the data from buffer SD to the SD card. Now here is the major part, these digital devices are designed to transfer this data with specific speed so if the transfer or write speed of any particular device for example is 40x, that is 6MB per second than there will be no effect on this transfer or write speed if you use a greater SD card speed. The speed of the card also depends on the specific digital device. If you have digital device which can write or read at higher speed than it is better to have a high speed SD card because most devices that have slower speed cards can not able to write or read proper data and in some cases these devices does not support these cards.