Multimedia Card

A MultiMediaCard ( MMC) is a digital storage medium.

The MMC standard was developed in 1997 by the Siemens subsidiary Ingentix together with SanDisk. A MultiMediaCard stores data via flash storage. She is 24 mm × 32 mm × 1.4 mm in size and has seven pins that are driven via an integrated controller. The storage capacity is between 2 MB and 8 GB. The data transfer speed is 2.5 MB / s Uses an MMC for example, in digital cameras, MP3 players, mobile phones.

Devices with SD memory card slot is backward compatible with Multi Media Cards in the rule. Thus, MMCs can usually operate in devices that are designed for SD memory card. The operation of SD card in devices that are designed only for MMC, however, is not possible. To avoid incorrect uses, SD cards have a slightly thicker body than MMC cards. Therefore SD cards will not fit in the MMC slots because of their thickness.

Although the MultiMediaCard is more and more displaced from the SD Memory Card, in February 2004, the MMCA ( MultiMediaCard Association ), a new standard, MMC 4.0, presented the below- optional on 4 or 8 bit increased bus width and higher clock rate other higher read and write speeds (ideally up to 52 MB / s) supported. The MMCplus cards (High Speed) support a read speed of up to 20MB / s and a write speed of 17 MB / s

The MMC interface lives on in the CE - ATA specification.

Reduced Size MultiMediaCard

The so-called RS- MMC ( Reduced Size MultiMedia Card ) is a scaled down by half version of the MMC, which is used especially in mobile phones. An adapter This is also usable in normal MMC devices. The biggest RS- MMCs currently hold (July 2007) 4096 MB ( 4 GB). The card is 24 mm × 18 mm × 1.4 mm in size and is also about 7 pins driven.

Some newer devices ( mostly mobile phones ) only deliver a supply voltage of 1.8 volts, in this case, is a dual voltage card required ( DV RS-MMC or MMC mobile, also up to 4096 MB available ). These cards can then be operated with two different supply voltages, namely 1.8 V or 3 V.

MultiMediaCard micro

Since early 2005, there is also the micro-MMC memory cards. This variant is only about one-third as large as the RS- MMC. The card is only 12 mm × 14 mm × 1.1 mm in size and so much bigger than a fingernail.

According to Samsung, the card reaches a reading performance of 10 MB / s and a write speed of up to 7 MB / s The card was designed especially for mobile phones and digital cameras. She works with an operating voltage of 3.3 or 1.8 volts.

The cards are available up to a memory size of 16 GB, this can by an adapter which is usually settled, be read also in normal MMC slots.

MMC micro has now been largely replaced by microSDHC. This format has a maximum capacity of 32 GB and offers the possibility of storing DRM license information in a protected memory area to prevent unauthorized use and dissemination of intellectual property. microSDHC cards offer, however, an even higher read and write speeds and memory sizes currently up to 64GB (November 2013) which sometimes, the reason why MMC card de facto no longer supported by mobile phones.

EMMC

A eMMC (embedded MultiMediaCard) is a specified by JEDEC, anabolic on the MMC standard energy-and space -saving storage medium, which was developed for use as an internal data storage in mobile devices.

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