An SD card's transfer speed is the rate at which the card is able to move data files from one place to another. This rate is typically measured in the number of megabytes that a card can transfer each second, often abbreviated as the unit "MB/s." The higher the transfer speed, the faster your camera will be able to write the photos onto your memory card when you take them, allowing you to take many high-resolution photos in quick succession without your camera's SD card getting clogged up.
Instructions
1. Pick up any SD or SDHC card. Look at the front of the card. The front is the side with the writing and/or graphics on it, while the back should be blank.
2. Look at the general center of the card, underneath and slightly to the right of the large "SD" letters on the front. If your card was manufactured since 2006 and is an SDHC, you should see a small symbol that looks like the letter "C" with a small number in the center. The number in the center of the "C" corresponds with the number of megabytes per second, or MB/s, at which your card can transfer files. For example, the letter "C" with a small "4" inside would indicate that your memory card has a transfer speed of 4 MB/s.
3. Search online for details on the SD card that you own if your SD card is an older make. If you still have the original package that your SD card came in, or the small user's manual paper that may have come with your card, you can look at that for the speed of your particular SD card. The letter "X" in the speed number stands for 150 kilobytes per second, or 150 KB/s. This is equivalent to 0.15 MB/s. The speed is defined as the number shown, multiplied by "X," or 0.15 MB/s. For example, the number "40x" on any SD card package would be equivalent to a transfer speed of 6.0 MB/s.
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