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Some SD card manufacturers even sell microSDHC cards together with SDHC-sized adapters to make it easier to move the cards between devices.

An SD card is a storage device that has many useful features depending on how and where its used.

Here are some common ways you might already use SD cards: You can add an SD card to a small device, like a mobile phone, to extend the storage space available for ringtones, texts, apps, music and other data.

When one SD card in your camera fills up with photos and videos, you can swap it out for an empty SD card instead of deleting any files.

You can save files to an SD card to transfer them between devices or give them to someone else.

SD cards conform to standards developed and maintained by the Secure Digital Association.

Panasonic, SanDisk and Toshiba formed the SD Association in January 2000 with the goal of developing and promoting standards for flash-memory storage.

SanDisks technology, already a global leader in flash memory products, became a template for the new standards.

Advertisement Headquartered in San Ramon, Calif., the SD Association doesnt make or market any products on its own.

However, more than 1,000 association members, primarily major electronics manufacturers worldwide, currently contribute to the ongoing improvements in SD standards.

You may have used other words, such as memory cards or flash memory, to describe SD cards in conversation.

The word memory, however, might be misleading to some people since its also used to talk about Random Access Memory ( RAM ), which serves a completely different purpose in computing.

The word flash describes the means in which the data is saved onto the solid-state material inside the SD card, which you can read about in How Flash Memory Works.

Here, well use the term SD card since were speaking of a flash-memory device that conforms to the SD standard and sports the SD Associations trademark.

In this article, well zoom in on SDs various form factors, capacities and speeds and take a look at the features, advantages and challenges of Secure Digital cards.

Advertisement Contents Types of SD Cards Speed Class and UHC Speed Class The Security in Secure Digital Inside the SD Card Challenges in Using SD Hardware The Future for Secure Digital Cards Types of SD Cards.

Shown here are a standard SD card, two SDHC cards and a microSDHC card.

Here are the physical sizes youll see for SD cards: 32 x 24 millimeters, 2.1 millimeters thick - This is the most common size youll see.

This size has nine pins and features a write-protection switch on one side to toggle between read-only and read-write states.

This is the mini version with 11 pins, and its less common than the other two sizes.

This is the micro version with eight pins.

Because its so small, this size has become popular in mobile devices like smartphones.

Its not just the physical makeup of the card thats standardized.

These are the capacity formats for SD cards listed in order from oldest to newest: Advertisement SD - Standard format with up to 2 GB per card, available in all three sizes, under 10 SDHC - High-capacity format with 4 to 32 GB per card, available in all three sizes, 10 to 100 SDXC - eXtended capacity format with 32 GB to 2 TB per card, available in the larger and micro sizes only, starting around 80 Thats three capacity formats, each in two or three sizes.

To read and write data to the card, youll need card-reader hardware that can handle both the size factor and the capacity class indicated.

Also, if youre using a mini- or micro-size card but have the large-size reader, you can insert the smaller card into a special adapter in the shape of the larger card.

Cprm Decrypter Sony Digital Camera