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The size of SD cards can vary significantly depending on the family of card being compared. Some SDIO cards also provide memory functions that can be used in devices which are designed to support SDIO cards. The SDIO card family was created by the SDA in order to provide enhanced input and output functions. Since each of these card types redefines the interface with the host device, they are not able to be used in legacy or older SD card devices. These cards are referred to as SDXC ( Secure Digital eXtended Capacity) and SDHC (Secure Digital High Capacity). The SDA also defined higher capacity SD cards with increased capabilities. Similarly, RS MMCs (Reduced Size MultiMediaCards) are just shorter MMCs that are able to be used in MMC slots through the use of an extending pice to the cards. The cards were originally branded TransFlash or TF. The miniSD and microSD cards were defined which are able to be used in larger SD card slots by use of a passive adapter. The SD Association has extended the specification in a number of ways since the spec was first published.ĭefinition of Electrically Identical Cards in Small Sizes If an SDIO card is going to be used however, the device must be able to support the various input and output functions that the card provides. Additionally, when new host devices are produced, they are typically designed with a fresher or newer version of the SD card specification that allows for backwards compatibility for older cards. In order to allow a smaller SD card to be used in a device designed to make use of a larger SD card, there are electrically passive adapters produced to provide compatibility of the card(s) with the host machine. Manufacturers are able to combine the different device families and form factors when producing cards for commercial or academic use. The form factors for SD cards include the micro size, mini size, and original size of the cards.
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The four families of card that are in use in the market include: SDHC (High Capacity), SDSC (Standard Capacity), SDXC (eXtended Capacity), and SDIO (combined input/output functions along with data storage). SD Card FamiliesĪt the time of this writing, the SD format includes four different card families and three different form factors. The standard for SD cards is maintained by the SDA (SD Card Association) and has been implemented in more than 400 brands and greater than 8,000 models across a large number of product categories. The SD standard was first introduced in 1999 as an improvement over MultiMediaCards. The cards are commonly used in tablet computers, cell phones, digital cameras, and GPS devices.
#Cprm sd card crack portable#
A SD card, or Secure Digital card, is a memory card used in portable devices for non-volatile memory storage.