SDHC Memory Card

SDHC (Secure Digital High Capacity) Memory Card
Secure Digital (SD) is a non-volatile memory card format developed by Matsushita, SanDisk, and Toshiba for use in portable devices. Today it is widely used in digital cameras, digital camcorders, handheld computers, PDAs, media players, mobile phones, GPS receivers, and video games. Standard SD card capacities range from 1 MB to 4 GB. The capacity range for high capacity SDHC cards overlap, beginning at 4 GB but reaching as high as 32 GB as of mid-2009. The SDXC (eXtended Capacity), a new specification announced at the 2009 Consumer Electronics Show, will allow for up to 2 TB capacity cards.

What is the SDHC Memory Card?
At the 2006 International CES, the SD Card Association (SDA) announced their establishment of the SD Specification Version 2.0 for the SDHC (Secure Digital High Capacity); making way for the SDHC to be the next generation SD Card. Engineered to meet higher memory capacities, the SDHC will meet the higher requirements in a new generation of technology that enables SD cards to reach higher capacities of 4GB to 32GB. New electronic devices that will utilize SDHC memory cards include audio/video and telecommunications gadgets such as digital cameras, camcorders, mobile phones, computers, PDAs, plasma televisions, and many more.

The growing demand for high-capacity flash memory springs partially from the increasing use of high-definition video and high-resolution digital photography. SDHC cards meet the challenge of these demanding products not only by providing ample storage but also by introducing a new feature: classifications of data transfer speed (DTS). Consumers can get the best performance value out of their digital products by using flash memory cards that support the device's highest standards for data transfer speed. The SDHC specification 2.00 calls for cards to be classified according to the minimal sustained DTS as follows:
• Class 2: minimum sustained DTS of 2MB/sec
• Class 4: minimum sustained DTS of 4MB/sec
• Class 6: minimum sustained DTS of 6MB/sec

What Speed Do You Need?
To help you find the right speed, SD/SDHC cards are broken down into four classes: Class 2, Class 4, Class 6 and Class 10. Class 2 cards offer a minimum sustained data rate of 2 megabytes per second (MBps), Class 4 of 4MBps and Class 6 of 6MBps and Class 10 of 10MBps. Depending on which manufacturer is selling the card, the speed class will either be prominently displayed or buried in the specs. Either way, look for it.

The benefits of SDHC memory cards extend beyond mere matters of size. Along with their tiny physical profile, there is also the fact that they hold a remarkable amount of memory and have blazingly fast data transfer speeds. While USB-based flash memory cards may be faster and offer more memory, they are much larger. Additionally, SDHC memory cards have an updated file storage system that allows them to store data more efficiently than SD memory cards.



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SDHC Memory Card