Genuine Sandisk Extreme3 SDHC Card 4GB 20mb/s UK item

SanDisk Extreme III expands its award-winning, professional line of memory cards with a new 4GB SDHC (Secured Digital High Capacity) card.  The SanDisk Extreme III 4GB SDHC memory card offers speed, performance and reliability to ensure you get your photos every time. A 4GB memory card can store more than 2,000 high-resolution pictures or up to 8 hours of MPEG 4 video*. 

• Fast 20MB/sec sequential Read/Write speeds
• Ideal for demanding photo shoots under severe weather conditions – heat, cold, wind, rain, snow etc.
• Durable, reliable and thoroughly tested for heat, cold, shock and vibration
• Class 6 speed performance rating (based on SD 2.0 specifications)

To support higher capacity needs, SD cards now require a different design. The new SD 2.0 specification which supports 4GB and up, is called Secure Digital High Capacity (SDHC). The SD Association has created and defined 3 speed classes to help you identify speed and performance capabilities/minimum requirements of SDHC cards and their SDHC host products. Details on the SD 2.0 specification: http://www.sdcard.org or uk.SanDisk.com/SDHC

 

The SDA speed class rating was developed to identify minimum data transfer and latency requirements for a host application and provide a means for consumers to match those requirements with an appropriately rated SD card.  For example, in the emerging application of real-time video capture (camcorders, camera phones etc.), in order to ensure smooth capture and playback of video, the camera buffer RAM must never experience a data over-run or under-run.  This requires that the card communicate certain parameters to the camera and then meet some minimum governing parameters.  An SDA speed class rating of 6 means that the card will be able to transfer (with specifically defined latencies and data allocation units) data in a random fashion without interruption.  Consumers should look at the intended host device to select the correct speed class rating in the card they buy.  Since speed class 6 is currently the highest rating defined by SDA, it doesn''''''''t necessarily mean that a speed class 6 is the fastest card that a consumer can buy for all applications.