Comparing high-speed SD cards means finding the best card for the application.
Secure digital, or SD, cards allow you to store digital content on several different electronic devices. A comparison of class speed needs, memory requirements and application uses will determine the desired type of high-speed SD card to purchase.
Class Identification
The most important identifier when comparing high-speed SD cards is the speed class identification. Based on information from the SD Association website, the speed rate specifications were established based on the needs of movie and video companies. Class speeds are divided into Class 2, Class 4, Class 6, Class 10 and UHS Speed Class 1. Class 2 applications include MPEG-4 video recording while Class 10 applications include full HD video recording.
Memory Capacity
In addition to the speed class, the memory capacity of a high-speed SD card is another consideration. Initially, full size SD cards only offered up to 2GB in memory storage. As of 2010, SD cards offer high-capacity storage, from 4GB to 32GB, and extended capacity memory that is more than 32GB, but less than 2TB.
Application
Common applications for a high-speed SD card are digital cameras, audio players and other electronic device. Other key applications are multi-purpose, high-speed mobile storage within devices like USB and eSATA card readers.
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