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UHS-II (which has a two rows of pins on the back of the card) has as transfer speed of up to 312MB/sec.UHS-I (which has a single row of pins on the back of the card) has a maximum transfer speeds of 104MB/sec.There are two UHS speeds, which indicate how quickly you can transfer data from the card onto another device, like a hard drive or SSD: Now, if you weren’t already confused with the three speed designations we just mentioned– Speed Class, UHS Speed Class, and Video Speed Class – there’s a fourth speed to learn about: UHS Bus Speed. When it comes to shooting 4K video, your card should have at least a V30 (for 30 MB/sec) designation.įor shooting 8K, most would suggest that it have either a V60 (for 60 MB/sec) or a V90 (for 90 MB/sec) designation. Lastly, in addition to the Speed Class and UHS Speed Class designations, the SDA also has a Video Speed Class designation: The symbol for this class has a large letter “V” net to the following numbers 6, 10, 30, 60, or 90, which can also be written as V6, V10, V30, V60, or V90.
HOW TO USE SD ADAPTER AS MEMORY CARD FULL
Additionally, to shoot full HD resolution video, you may be able to get by with a Class 4 memory card, but most experts would suggest getting a Class 10 memory card (for sustained shooting at 10 MB/sec.) 4K video requires the card to capture video at 30MB/sec. Also, on the right, you can see which write speed and speed class are required for a specific video format (8K, 4K, HD/Full HD and SD video).Īccording to the Secure Digital Association and others in the industry, the top designation of U3 Class is the only one suitable for 4K-resolution video capture. In this chart (from page 2 of the SD Association's SD Standards-Universal, High Performance Mobile Storage brochure), you can match an SD memory card's speed class with the specific minimum sequential write speed. Your safest bet is to make sure this minimum rating is above the video bitrate of your camera. Each of these refers to a card's minimum write-speed. Written on SD cards you should see either the Speed Class (the symbol for Speed Class has one of the following numbers-2, 4, 6 or 10-with a circle around it) or the UHS Speed Class (the symbol for UHS Speed Class has either the number 1 or 3 inside the letter “U”). For example, a camera that writes video at 400 Mbps will require a card with a minimum sustained write speed of 50 MB/s (400 Mbps ÷ 8 = 50 MB/s). So, how do you figure out what card speed is required for your particular camera? One MB (megabyte) is equal to 8 Mb (megabits), so we can divide the maximum write speed of the camera in Mbps by 8 to get MBps. In contrast, cameras list their fastest write speeds in Mbps (mega bits per second). Memory cards list their rated speed in MB/s (mega bytes per second). Note that confusingly, cameras and memory cards typically use different, though similar sounding, units for speed ratings. Even if they do, it's important to note that often, a stated write speed is only a maximum - it's not necessarily a guarantee of sustained performance. However, most memory cards do not list it on the card. Write speed is the more important specification, particularly for video. Sometimes, you’ll also see other numbers like “1066x” or “133x,” which are mostly found on CompactFlash cards – they’re essentially a multiplier of the data-transfer rate of audio CD files, which is 150 KB a second. For example, your card may be labeled as “300MB/s,” which tells you that your card supports data-reading (say, transferring to your computer) at a maximum rate of 300 megabytes per second. On most memory cards, of all types, you’ll often see a number followed by “MB/s,” which is an indication of the card’s maximum sequential read speed in megabytes per second. But the latest SDXC-compatible card readers will be backwards compatible with older SD-formats, such as SDHC and SD memory cards. Note that you can’t use an old SDHC card reader to read files from an SDXC memory card due to the different file systems. SDHC (Secure Digital High Capacity) uses a FAT32 file system and can store between 4GB and 32GB data, while SDXC (Secure Digital Extended Capacity) has an exFAT file system and can store 64GB and 2TB of data. These two abbreviations refer to the type of SD memory card or its format. We’ve also annotated an SDXC memory card to show you what these marking look like on an actual memory card. Because of the large variety of different types, SD cards are arguably the worst culprits.īelow, we’ve included a list of common symbols, abbreviations and numbers you’ll often find on SD memory cards. You’ll find various cryptic marking on your memory cards, which at times may be confusing to understand.