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SpinDistribute.com Article Directory

The following article was published in our article directory on December 28, 2010.
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What to Expect in a Secure Digital Memory Card

Article Category: Computers and Technology

Author Name: Leo Schwartz

When Sony released the Memory Stick back in 1998, there was a buzz on whether this would turn out to be the beginning of the next wave of high-density file storage data. It was about as small as a slice of chewing gum and it was ideally supposed to provide more storage capacity and faster data transfer that hard disks could only dream of doing. The response was quick and Matsushita (Panasonic), Toshiba, and SanDisk all joined forces to come up with a standardized competitor for this product. Thus, in 2001, the Secure Digital Memory Card was born, ready for mass consumption.

The Secure Digital Memory Cards were based upon their forerunners, the MultiMediaCard (MMC) but were improved through the addition of two distinct features that were not available on MMCs back then. These two bonuses were a write-protected switch and an integrated copyright protection, of both will be elaborated on.

Think of the write-protected switch the way the floppy disk worked when it was still the gadget used to save files and not the universal serial bus (USB) that are a necessity today. There is a switch in the corner of the 3.5-inch floppy that provides the user with the option of whether the work can be edited and rewritten in the future or if it will be set in stone once the work is complete. The same holds true for the flash memory cards. A small tab seen in most, not all, SD memory cards gives users that similar option of whether all data input can still be changed accordingly or not.

On the other hand, the integrated copyright protection was an add-on that was not directed towards public demand or but rather to address to ever-growing issue of piracy that is still a major concern until today. To help remedy and alleviate this problem, the gadget has encryptions that prevent pirates from duplicating content just like that.

This move is a response to the content protection for recordable media (CPRM), as Secure Digital cards are normally built in with a particular cryptographic scheme that block attempts of duplication of physical media. This is particularly geared towards music files in mp3 format that are becoming easier and easier to manipulate and move at anyone's beck and call. At least, that has been the ideal. The tendency of manufactures to fail to install the necessary drivers that apply CPRM renders this technology useless and allows pirates to bypass into the system and copy every music file they want to their heart's content.

In terms of speed, SD memory cards easily jackrabbit past CompactFlash (CF) and MMC memory cards. Data transfer is done by 1-bit protocol, although it has evolved into 4-bit protocol and SPI. Remember that a higher amount of storage does not necessarily translate into a faster data transfer speed. So don't expect a 32GB to transfer files any faster than a 4MB would. It will just hold more inside that little chip. Remember that in the end, whether it be a SanDisk Secure Digital or not, choosing the right flash memory card is an art as much as it is a science.

Keywords: Secure Digital

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