30 Jun 2010 @ 11:15 PM 

SD, SDHC, SDXC, SDHC UHS-I,SDXC UHS-I, (normal-) SD, mini-SD, micro-SD size

credit: SD Videos – SD Association.

SD cards – Usage Tip Videos

See what’s new with SD technology! Find out how to use all SD memory cards and the new UHS-I high speed performance option available for SDXC and SDHC. Learn how to match the new UHS symbols on memory cards to your devices and other usage tips to achieve the best performance.

Watch this video and see how easy it is to use SD Memory Cards in all of the new and exciting SDXC and SDHC devices. To enjoy the optimum experience, simply check your device’s Owners Manual and then match your SD memory card to the device. Since SD is backwards compatible, you can even use your existing cards in new products, too.

Find the Right SD Memory Card

SD miniSD microSD
Full Size
(Up to 2GB)
SD miniSD microSD
High Capacity
(4GB to 32GB)
Extended Capacity
(Over 32GB up to 2TB)

SD memory cards come in a variety of speed classes and three different physical sizes: SD, miniSD, and microSD. The SD card is typically used in personal computers, video cameras, digital cameras and other large consumer electronics devices. The microSD and miniSD cards are commonly used in smaller electronic devices like mobile phones. Some manufacturers offer adapters to fit a traditional SD card slot, allowing even greater versatility and flexibility to use the card in a mobile phone as well as a computer or video camera.

To determine the right card for your device, always consult the device’s user manual or contact the manufacturer. All SD memory card formats are readily available in the marketplace and can be found in a range of retail outlets including drug stores, electronics and computer shops and Internet sites.

Choosing the Best Card – What Memory Capacity do I Need?

SD memory cards come in a variety of memory capacities designed to fit your needs and budget. The next-generation SD memory card specification, SDXC, offers the greatest memory capacity and UHS SDHC and SDXC products offer the fastest performance. Your device’s users manual may help you select the memory that is right for your device. You can also determine the best memory capacity based on how you plan to use the card. For cameras, consider the picture resolution of every photo, and for your MP3 player, the bit-rate required for smooth playback. Take a look at our reference chart that illustrates the various storage capacities.

2 GB 4 GB 8 GB 16 GB 32 GB
(Hi-def movie recording MPEG-4. H.264)
Fine mode (13Mbps/CBR) 20 min. 40 min. 80 min. 160 min. 320 min.
Normal mode (9Mbps/VBR) 30 min. 60 min. 120 min. 240 min. 480 min.
Economy mode (6Mbps/VBR) 45 min. 60 min. 180 min. 360 min. 720 min.
10 Megapixels, 3648×2736, Fine mode 770 photos 1,540 photos 3,080 photos 6,160 photos 12,320 photos
ACC, MP3 HQ mode, 128Kbps 34 hr. 7 min. 68 hr. 14 min. 136 hr. 27 min. 272 hr. 54 min. 545 hr. 48 min.

* All numbers are approximate. Actual storage will depend on size of data and compression used.

How to Pick the Best Speed

For greatest performance, users should pair their devices with the corresponding SD memory card. Your device user’s manual will help you select the SD memory card performance that will maximize your device performance.

SD Speed Class/UHS Speed Class

Greater Performance Choices

There are two kinds of Speed Class, “Speed Class” and “UHS Speed Class.”

As a characteristic of flash memory, actual transfer speed varies. Variable speeds are difficult to reliably record streaming content such as video because it requires a constant writing speed. Speed Class and UHS Speed Class provide the constant speed necessary for video recording by designating a minimum writing performance so that minimum and constant speed is guaranteed for camcorders, video recorders and other devices with video recording capabilities under the conditional write operation specified in the specification.

Speed Class, designated as Class 2, 4, 6 and 10, is designed for normal and high speed bus interface (mode) and UHS Speed Class 1 is designed for UHS-I bus interface*. (Speed Class and the UHS Speed Class are not compatible.)

*UHS (Ultra High Speed), the fastest performance category available today, defines bus-interface speeds up to 104 Megabytes per second for greater device performance in SDXC and SDHC host products.

Marks Operable Under… Applications SD Memory Card
Speed Class 2 Normal Bus I/F SD video recording SD, miniSD, microSD
SDHC, miniSDHC, microSDHC
4 6 HD ~ Full HD video recording
10 High Speed Bus I/F Full HD video recording
HD still consecutive recording
UHS Speed Class 1 UHS-I Bus I/F Full higher potential of recording real-time broadcasts and capturing large-size HD videos SDHC UHS-I and SDXC UHS-I

UHS Speed Class Compatibility

Look for these logos when choosing a SD Card and host device

Speed Class Compatibility

Look for these logos when choosing a SD Card and host device

Fragmentation and Speed

The memory of a card is divided into minimum memory units. The host writes data onto memory units where no data is already stored. As available memory becomes divided into smaller units through normal use, this leads to an increase in non-linear, or fragmented storage. The amount of fragmentation can reduce write speeds, so higher SD card speeds help compensate for fragmentation.

The SD Association has specified operating conditions for SDHC, SDXC, SDHC UHS-I and SDXC UHS-I memory cards to guarantee the minimum speed according to the card’s speed class. Speed logos are provided to help identify cards that comply with these specifications.

Posted By: Teodor Muraru
Last Edit: 30 Jun 2010 @ 11:31 PM

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