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The following article was published in our article directory on January 3, 2011.
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How to Distinguish a Secure Digital Memory Card

Article Category: Computers and Technology

Author Name: Leo Schwartz

The Secure Digital Memory Card is not to be mistaken with its extended form in the MultiMediaCard (MMC) and its contemporaries in the miniSD and microSD versions. This memory card played its part as the first wave of non-volatile formats developed by the triumvirate of Matsushita, Toshiba, and SanDisk as a delayed response to Sony's Memory Stick. By non-volatile or involatile, this characteristic means that even without any form of power running, the object is able to keep all the information that is stored onto it unless it is edited by the user or is destroyed altogether.

As a flash memory card, Secure Digital became dominant in the digital storage market because people needed a backup to their primary storage data aside from their own computer's random access memory (RAM). When computers crash, all the data and information is irretrievable and that is why a flash memory card is crucial so that all is not lost.

The flash memory card can be considered similar to the Electrically Erasable Programmable Read-Only Memory (EEPROM, i.e. USB flash drives) in the sense that it is in a solid state but it can retain a higher amount of memory in a small piece of chip. Flash memory cards such as Secure Digital are also likely to be found in PC basic input-output system (BIOS) chips. It runs on NOR and NAND architecture flash memories and use pages, or the building blocks and packets by where all the needed information is stored.

Physically, it is easy to differentiate the standard version of an SD memory card with its peers. It measures 24mm x 32mm as compared to the miniSD and microSD, that are a lot smaller, as their names suggest. Telling a standard memory SD card apart from an MMC is trickier as they are both of the same size, but the former is asymmetrically-shaped so that it will only fit one possible way into the slot while an MMC may appear to fit either way even if it really cannot.

There are also instances when certain SD slots can fit right into slimmer MMCs, but not the other way around. This happens when SD memory cards are too bulky to fit into tighter MMC card reader slots. MMC tend to have backward compatibility and there is no definite rule on whether one will work on the other. The only way to find out is by researching and updating oneself beforehand prior to purchase to avoid incurring unnecessary costs.

There have been issues raised on how hard it is to develop I/O slots for standard SD cards and the same problems are posed on its smaller counterparts. There may be problems in compatibility with devices that run on Bluetooth, but recent improvements and developments have curbed this matter.

Secure Digital High Capacity 2.0 (SDHC) is the newer version and works a lot faster by using sector addressing instead of the standard SD's byte addressing. While some SDHC cards carry with it backward compatibility, it would be wise to constantly update the firmware of the device to ensure that it can be supported.

Keywords: Secure Digital

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