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By Chris De Herrera 
Copyright 1998-2007
 All Rights Reserved
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Multimedia Cards & Secure Digital Cards
By Chris De Herrera, Copyright 2001, 2002

Version 1.02  Revised: 6/24/2002

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Introduction

Multimedia Cards (MMC) were invented by Sandisk to allow for even smaller form factor for data storage.  The Multimedia Cards are approximately the size of a postage stamp with the thickness of about 1 mm. You can use MMC cards in devices that support SD cards if you do not need encryption.

Sandisk 64 MB MMC Card Sandisk 32 MB MMC Card

Specifications

In this small size you can get 8, 16, 24, 32 or 64 MB of storage.  This storage is actually read and written serially (one bit at a time) so the speed is slower than CompactFlash or PC Cards at approximately 2 MB per second.

Multimedia Card
Purchase at Amazon.com

16 MB 32 MB 64 MB
Sandisk Sandisk Sandisk
Viking Viking Viking
Delkin Delkin n/a

 

Multimedia Card
Purchase at Amazon.de

16 MB 32 MB 64 MB
Sandisk Sandisk Sandisk
Lexar Lexar Lexar
    Nokia

Encryption

There is a special version of the Multimedia Card with built-in encryption support.  These cards are called Secure Digital (SD) Cards.  They offer hardware based encryption to prevent unauthorized tampering with the data.  The Casio EM-500, EM-505 support Secure Digital cards after you have loaded the Casio SD driver.  Also, you can use MMC cards in an SD slot.

 Secure Digital Card
Purchase at Amazon.com

16 MB 32 MB 64 MB 128 MB
Sandisk Sandisk Sandisk Sandisk
Viking Viking Viking Viking

 

 Secure Digital Card
Purchase at Amazon.de

16 MB 32 MB 64 MB 128 MB
Sandisk Sandisk Sandisk  
  Lexar Lexar  

Vendors

Currently Sandisk, Viking and others are selling the Multimedia Cards.  Since the MMC and SD cards are standards based multiple vendors will sell them and they will be compatible across platforms.

Peripherals

You can get a desktop reader for MMC or SD cards that uses the floppy disk, parallel or usb ports from Sandisk.  These adapters allow you to quickly read and write data to the MMC or SD card.  In the future, there will be support for SD based peripherals however none has arrived yet.

Sandisk Secure Digital Card Reader Sandisk MMC Card Reader Buy at Amazon Sandisk FlashPath MMC Reader

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