About Memory Card and How to Use It?
The original SD card measures just 24mm x 32mm x 2.1mm around the size of a normal postage stamp. The slim, lightweight and compact design of secure digital memory cards ensures easy handling, a very important need for a product that will be moved between different consumer products.
An SD Card compatible product or device can easily video clips and play music using the decoder software built into the card. This can be achieved without the use of a drive mechanism like those in DVD and CD players.
This has several advantages of past media storage, the main two being that the equipment can be more compact and there is a great improvement on reliability due to the fact that there are no moving parts. This gives SD Card product designers a new creative freedom to explore a wider range of design concepts.
A new specification was introduced by the SD card Association that specified the smallest data transfer rate required for standard and high-capacity SD memory cards. The specification highlighted the fact that the new SD Cards had the ability to store between 4GB to 32 GB and that you could do more at ever greater speeds across the entire SD card line. The high-capacity SD memory cards are recognized by the inclusion on all cards of "Secure Digital High Capacity" to make sure the consumer is not confused and that the new capability is clearly designated.
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Of course more storage is just one part of the SD Memory Card issue, with more memory comes the need for more speed. This problem is solved with the introduction of 3 new speed classes. The new Speed Classes will allow host products to check the Secure Digital Memory Cards fragmented state and calculate the correct write speed for each part of the card. This allows the host to quickly determine the best place to write the data to according to its data speed requirement.
There are three SDHC speed classes and they are:
Class 6, Class 4 and Class 2 - ensuring transfer speeds of at least 6, 4 and 2 MB per second. This ensures that each product can be analyzed for suitability and guarantee performance of your products.
How to use SD Memory Cards:
One of the many ways that secure digital memory cards or SD memory cards can be used by customers is in the protection of their personal data. Performing a regular back up of your computer data is a good idea and SD Memory Cards is a cost affective way of doing this. Not only can you back up your data to SD Memory Cards but you can also take it with you if you ever need it.
The SD Card technology used to make sure content protection for Recordable Media (otherwise known as CPRM) is a key enabler to control distribution of data for music and other commercial media. CPRM can guarantee a high level of data protection against any form of illegal copying. The copy protection technology was designed and developed by the organization, 4C Entity, LLC. LLC is an association made up of IBM, Toshiba, Panasonic, and Intel.
Built into secure digital memory cards is an enhanced form of "Key revocation" technology, first used to great success in DVD format.
The data can be read and written only if the correct external devices are detected using the card's control circuitry. The SD Card is restricted to three copies from a PC to the SD card and this is in compliance with the specification for SDMI. All SD Audio products and technology comply with SDMI.
The following functions can be expected on your SD card in term of copyright protection:
• Any access to an SD card must be enabled by the use authentication between devices.
• Whenever there is exchange of security.
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