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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.
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| 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.
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Multimedia Card |
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| 16 MB | 32 MB | 64 MB |
| Sandisk | Sandisk | Sandisk |
| Viking | Viking | Viking |
| Delkin | Delkin | n/a |
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Multimedia Card |
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| 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.
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Secure Digital Card |
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| 16 MB | 32 MB | 64 MB | 128 MB |
| Sandisk | Sandisk | Sandisk | Sandisk |
| Viking | Viking | Viking | Viking |
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Secure Digital Card |
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| 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.
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| Sandisk Secure Digital Card Reader | Sandisk MMC Card Reader Buy at Amazon | Sandisk FlashPath MMC Reader |
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