Difference Between SD and MMC

SD and MMC are used for storage in a portable device. They are available in various sizes.


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SD stands for Secure Digital, whereas MMC stands for MultiMediaCard. They have their characteristics and differ from each other.

A non-volatile memory format is in SD.


SD can only be used if the device has an SD slot and it is compatible, whereas MMC should have its slot so that it can sit in the device. The transfer rate of SD cards is 20MB per second, but MMC has 8 MB per second. SD is used in mobile phones, not in digital cameras. Digital cameras use MMC.


SD full form is Secure Digital. SanDisk, Toshiba, and Panasonic made SD together.

This is only used in digital cameras and music players. It has various storage differences.

It ranges from 152 MB to 2 GB. It is also found in high capacity, which is available for 4GB to 32 GB

The latest version now allows up to 2TB.

MMC’s full form is MultiMediaCard. It is a memory card.

Siemens SG and SanDisk developed the MMC together. Toshiba’s NAND-based flash memory inspired to make MMC.

It can store from 152MB to 32GB. The length of the card is 24mm, breadth is 32mm, and height is 1.4mm.

Comparison Table

Parameters of ComparisonSDMMC
Full-FormSecure DigitalMultiMedia Card
DevelopersSanDisk, Toshiba and PanasonicSanDisk and Siemens
Dimensions32.0mm x 24.0mm x 2.1mm24.0mm x 32.0mm x 1.4mm
TypesminiSD, microSDRS-MMC, MMC PLUS, metal extender
UsageMobile phoneDigital Camera

What is SD?

SD cards were made in an updated version of MMC. SD cards are differentiated based on their capacities.

It ranges from 152 MB to 2 GB. High-capacity SD cards can hold data from 4GB to 32 GB.

These high-capacity SD cards are known as SDHC. The latest version is known as the Extended Capacity SD card.

It can hold data up to 2TB. It is a non-volatile card.

It gets invented in 1999.

It is found in three different sizes. They are SD, miniSD, and microSD.

SD has SPI bus mode. The microcontrollers in the SD card use this bus.

A 3.3-volt interface is used in that SD card. It does not need any host license.

There are many transfer modes available on SD cards.

The one-bit SD bus mode has a transfer format and separates commands and the various data channels. There are 9 pins inside the SD card.

The four-bit SD bus mode has reassigned pins that use four data lines to transfer data faster. Host devices are applicable to send 48-bit commands.

A host device is capable of determining memory capacity, type and writing to flash memory. It also determines the capabilities of the SD card.


What is MMC?

MMC is known as MultiMedia card. The developers are Siemens SG and SanDisk.

It was invented in the year 1999. The dimensions of the card are 24mm x32mm x 1.4mm.

It transfers the data at the rate of 20MB per second. It can store data up to 512 MB.

It uses 1-bit serial interface.

With digitalization, it has been upgraded, and now it is capable enough to transfer 4 or 8 bits per second. These are used in all kinds of digital devices.

There are four types of MMC available in the market.

They are MMC, RS-MMC, MMC PLUS, and metal extender. There are many more types that were later introduced in the market.

It has to be put into a mechanical adapter.

It can store data of about 2GB. Nokia used RS-MMC in their 770 internet tablet and generation 65.

Later, when Nokia switched to microSD, the RS-MMC was dropped out.

These were no longer in use. MMC can store enough of 32MB.

It has a transfer rate of up to 8MB per second. SanDisk and Siemens joined together in the making of the card.

The range is from 152MB to 32GB. RS-MMC is found in very small size.

It is half of the size of MMC.


Main Differences Between SD and MMC

  1. The full form of SD is Secure Digital, but the full form of MMC is MultiMediaCard.
  2. SD was built by SanDisk, Toshiba, and Panasonic, but MMC was built by SanDisk and Siemens.
  3. The SD card can keep up to 4TB of data, but MMC can hold up to 32 MB.
  4. The dimensions for SD card is 32.0mmx24.0mmx2.1mm but for MMC is 24.0mmx32.0mmx1.4mm.
  5. SD can be found in SD, miniSD, and microSD, whereas MMC can be found in MMC, RS-MMC, MMC PLUS, and metal extender.
  6. SD card is used in mobile phones, whereas MMC is used in digital cameras.
Difference Between SD and MMC


  1. https://books.google.com/books?hl=en&lr=&id=pJaiMUkcpDwC&oi=fnd&pg=PP1&dq=sd+card&ots=jfSfB9hPmd&sig=8ajkiI9ucQwy9rrRUXxhZtqH3GU
  2. https://en.cnki.com.cn/Article_en/CJFDTotal-JSJZ200501028.htm
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