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Secure Digital (SD) are one of the most popular types of flash cards which allow you keep your information on a small and thin "plastic". The contributing factors to Secure Digital's success are simple, size and price.

Secure Digital flash card standard was developed by three big companies -Panasonic, SanDisk, and Toshiba. SD is based on the Toshiba's Multi Media Card (MMC) format. Panasonic was the first of many companies who began to use Secure Digital Cards with their products. Now more than 665 different manufacturers support SD. Mainly, we find Slots for SD in portable devices such as PDA, digital cameras, cell phones, digital music players, digital video camcorders, smart phones, car navigation systems, electronic books etc. For example companies such as Dell, palmOne, HP, Toshiba, Sharp each have SD slots with theirs PDAs.

The size of a Secure Digital card is 24mm by 32mm by 2.1mm. It's size and weight (approximately two grams) is amazing because this small thing can contain different information up to 2 gigabytes. There are different standards of capacity for SD: 16MB, 32MB, 64MB, 128MB, 256MB, 512MB, 1GB and 2GB. It means that you can choose a card according to your finances. By the way, 4GB and 8 GD SDs are on the way.

First of all it should be said that SD cards are one of the best ways to keep your information. You can write, copy, download, and backup any information with it. It doesn't need any power to store any data, so don't be afraid of using it as a portable CD. Also, it is proven that any data can be re-written up to 1 million times. It means that it is more than enough to re-write daily 25 times for 10 years.

As previously mentioned, SD has a predecessor - Multi Media Card (MMC). Both cards have almost the same physical dimensions, so you can use MMC card with an SD slot. Also we can mark other differences:
1. Content protection. SD has content Protection for Recordable Media (CPRM), the copyright protection technology. This technology helps to protect different types of media content. It was developed by 4C (IBM, Intel, Matsushita(Panasonic trademark), and Toshiba). Also we should mention SDMI - Secure Digital Music Initiative conference which was established by UMG, BMG, EMI, WMG and SME. Their purpose is protection of music copyrights.
2. Planned capacity growth. As was written before in near future there will be available 4GB and 8 GB SD cards.
3. High-speed data transfer. There are three transfer modes supported by SD: SPI mode (separate serial in and serial out), 1 bit SD mode (separate command and data channels and a proprietary transfer format), and 4 bit SD mode (uses extra pins plus some reassigned pins) to support 4 bit wide parallel transfers. Low speed cards support 0 to 400 kbit/s data rate, SPI and 1 bit SD transfer modes. High speed cards support 0 to 100 Mbit/s data rate in 4 bit mode and 0-25 megabit per second in SPI and 1 bit SD modes.
4. Write protect switch which is switched by user to prevent data erasure.

The next step after SD is miniSD card which could be used in cell phones or smart phones. There are no any differences in cards. But miniSD is only 37% the volume of an SD Memory Card. Also, it is size is not as large as SD ones.

By the way, SD slots which support SDIO (Secure Digital Input Output) can be used with different devices like GPS receivers, WiFi or Bluetooth adapters, modems, barcode readers, IrDA adapters, FM radio tuners, RFID readers or digital cameras. Theoretically, RS-232 serial adapters, TV tuners, fingerprint scanners, SDIO to USB host/slave adapters, magnetic stripe readers, combination Bluetooth/WiFi/GPS receivers, Ethernet adapters and cellular modems also can be plugged in SD slot. For example SanDisk produces SanDisk's 256MB + Wi-Fi SD. Of course all these things are most useful for PDAs or cell phones with SD slots. SD is very reliable standard of keeping of data. But, it is not insured and your can be corrupted. Thankfully, with the help of Flash File Recovery, you have the ability to restore any photos unintentionally deleted. So, don't waste your time, and insure your photos with Flash File Recovery!"

It should be said that all our tests of Flash File Recovery with Secure Digital cards were realized perfectly. Any deleted, lost or damaged photos were recovered very fast and with their original quality. In our tests we tried different cards, manufacturers, and cameras. There were no problems with recovering.

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