Editing MultiMediaCard (section)

{{short description|Memory card format}}
{{distinguish|SD card}}
{{Infobox media
| logo          = 
| image         = 15-04-29-MMC-Karte-RalfR-dscf4734-d.jpg
| caption       = 32&nbsp;[[Megabyte|MB]] MMCplus card
| type          = [[Memory card]]
| capacity      = Up to 512&nbsp;GB
| read          = 
| write         = 
| standard      = 
| owner         = [[JEDEC]]
| use           = Portable devices
| dimensions    = Standard: 32&nbsp;×&nbsp;24&nbsp;×&nbsp;1.4&nbsp;mm
| weight        = Standard: ~2.0 g
| extended from =
| extended to   = [[Secure Digital]] (SD)
| released      = 1997
}}
{{Memory types}}

'''MultiMediaCard''', officially abbreviated as '''MMC''', is a [[memory card]] standard used for [[solid-state storage]]. Unveiled in 1997 by [[SanDisk]] and [[Siemens]],<ref>{{cite book |url=https://www.tomshardware.com/reviews/flash-removable-storage-ssd-drive,3626-3.html |title=Upgrading And Repairing PCs 21st Edition |publisher=Que Publishing |author=Scott Mueller |date=3 August 2014 |isbn=978-0789750006 }}</ref> MMC is based on a surface-contact low-pin-count serial interface using a single memory stack substrate assembly, and is therefore much smaller than earlier systems based on high-pin-count parallel interfaces using traditional surface-mount assembly such as [[CompactFlash]]. Both products were initially introduced using SanDisk [[NOR flash|NOR-based flash]] technology.

MMC is about the size of a postage stamp: 32&nbsp;mm&nbsp;× 24&nbsp;mm&nbsp;× 1.4&nbsp;mm.  MMC originally used a 1-[[bit]] [[serial interface]], but newer versions{{when|date=March 2018}} of the specification allow transfers of 4 or 8 bits at a time. MMC can be used in many devices that can use [[Secure Digital]] (SD) cards. MMCs may be available in sizes up to 16 [[gigabyte]]s (GB).

They are used in almost every context in which [[memory card]]s are used, like [[mobile phone|cellular phone]]s, digital audio players, [[Digital camera|digital cameras]], and [[Personal digital assistant|PDA]]s. Typically, an MMC operates as a storage medium for devices, in a form that can easily be removed for access by a [[Personal computer|PC]] via a connected MMC reader.

'''eMMC''' ([[embedded system|embedded]] MMC) is a small MMC chip used as [[Embedded system|embedded]] [[non-volatile memory]] that is normally soldered on [[printed circuit boards]], though pluggable eMMC modules are used on some devices (e.g. [[Orange Pi]] and [[ODROID]]).<ref>{{Cite web |last=Hunt |first=Cale |date=2023-02-06 |title=eMMC vs. SSD storage: What's the difference? |url=https://www.windowscentral.com/emmc-vs-ssd |url-status=live |archive-url=https://web.archive.org/web/20240218153058/https://www.windowscentral.com/emmc-vs-ssd |archive-date=2024-02-18 |access-date=2024-03-04 |website=Windows Central |language=en}}</ref><ref>{{Cite web |last=Ree |first=Brian |title=eMMC Memory Modules: A Simple Guide |url=https://magazine.odroid.com/article/emmc-memory-modules-a-simple-guide/ |url-status=live |archive-url=https://web.archive.org/web/20230921195144/https://magazine.odroid.com/article/emmc-memory-modules-a-simple-guide/ |archive-date=2023-09-21 |access-date=2024-03-04 |website=ODROID Magazine |language=en-US}}</ref><ref>{{Cite web |title=Orange Pi 32GB/64GB/256GB eMMC Module |url=http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/details/Orange-Pi-emmc.html |url-status=live |archive-url=https://web.archive.org/web/20240206002753/http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/details/Orange-Pi-emmc.html |archive-date=2024-02-06 |access-date=2024-03-04 |website=www.orangepi.org}}</ref>