what is the different of MMC card & SD CARD?

Answer 1

The SD Memory Card is a groundbreaking new bridge media that's helping to pave the way for tomorrow's fully networked society. This tiny, easy-to-use card offers a host of powerful advantages. It links various kinds of digital equipment through its easy connectivity, that supports a host of application formats and does not require the use of a PC. Further, the SD Memory card has the broad interoperability and compatibility needed to ensure that its applications will continue to expand far into the future. Already supported by more than 665* companies around the world, the SD Memory Card is well on its way to becoming the de facto standard memory card for digital connectivity. Soon, the SD Memory Card will provide universal access to an even wider array of multi-media data. The ubiquitous network era is coming, and its key is the SD Memory Card.

MultiMediaCard (MMC) and the lately released MultiMediaCard Plus based on MMC System Specification v4.0, are tiny memory cards that make storage portable among various devices, such as portable multimedia players, digital camcorders, handheld PCs, mobile phones and other devices that feature a MultiMediaCard-compliant slot.

Answer 2

Dear,

The MultiMediaCard (MMC)

The MultiMediaCard (MMC) is a flash memory memory card standard. Unveiled in 1997 by Siemens AG and SanDisk, it is based on Toshiba's NAND-based flash memory, and is therefore much smaller than earlier systems based on Intel NOR-based memory such as CompactFlash. MMC is about the size of a postage stamp: 24 mm x 32 mm x 1.5 mm. MMC originally used a 1-bit serial interface, but newer versions of the specification allow transfers of 4 or sometimes even 8 bits at a time. They have been more or less superseded by Secure Digital cards, but still see significant use because MMC cards can be used in any device which supports SD cards.

Typically, an MMC card is used as storage media for a portable device, in a form that can easily be removed for access by a PC. For example, a digital camera would use an MMC card for storing image files. With an MMC reader (typically a small box that connects via USB or some other serial connection, although some can be found integrated into the computer itself), a user could copy the pictures taken with the digital camera off to his or her computer. Modern computers, both laptops and desktops, often have SD slots, which can read MMC cards.

MMC cards are currently available in sizes up to and including 8 GB, and are used in almost every context in which memory cards are used, like cellular phones, digital audio players, digital cameras and PDAs. Since the introduction of Secure Digital card few companies build MMC slots into their devices, but the slightly thinner, pin-compatible MMC cards can be used in almost any device that supports SD cards. An exception is some mobile devices like the Nokia 9300 communicator, where the smaller size of the MMC card is a benefit.

Secure Digital (SD)

Secure Digital (SD) is a flash memory (non-volatile) memory card format used in portable devices, including digital cameras and handheld computers. SD cards are based on the older MultiMediaCard (MMC) format, but most are physically slightly thicker than MMC cards. They also boast higher data transfer rates, but this is always changing, particularly in light of recent improvements to the MMC standard. Most offer a write-protect switch on the side. Digital rights management features are available but are little used. SD cards generally measure 32 mm × 24 mm × 2.1 mm, but can be as thin as 1.4 mm, just like MMC cards (see below).

There are different speed grades available which use the same measurement system as CD-ROMs: a multiple of 150 KB/s. Basic cards transfer data up to 6 times as fast (900 KiB/s) as the standard CD-ROM speed. High-speed cards are made with higher data transfer rates like 66x (10 MB/s), and high-end cards have speeds of 133x or higher. Some digital cameras require high-speed cards to record video smoothly or capture multiple still photographs in rapid succession. As of December 2005, most devices comply to the SD card specification 1.01, with maximum speed of 66x. Higher speeds of up to 133x are defined by specification 1.1.

Devices with SD slots can use the thinner MMC cards, but the standard SD cards will not fit into the thinner MMC slots. SD cards can be used in CompactFlash or PC Card slots with an adapter. miniSD and microSD cards can be used directly in SD slots with a physical interface adapter. There are some SD cards with a USB connector for dual-purpose use, and there are card readers which allow SD cards to be accessed via many connectivity ports such as USB, FireWire, and the common parallel port. SD cards can also be accessed via a floppy disk drive with a FlashPath adapter.


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Answer 3

Different size slot and connectors :)

I know its a simplistic answer but as far as most consumers are concerned its the most important distinguishing factor