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2. Memory card reader - Wikipedia

   en.wikipedia.org/wiki/Memory_card_reader

   The number of different memory cards that a multi card reader can accept is expressed as x-in-1, with x being a figure of merit indicating the number of memory cards accepted, such as 35-in-1. There are three categories of card readers sorted by the type and quantity of the card slots: single card reader (e.g. 1x SD-only), multi card reader (e ...

3. SD card - Wikipedia

   en.wikipedia.org/wiki/SD_card

   At power-up or card insertion, the voltage on pin 1 selects either the Serial Peripheral Interface (SPI) bus or the SD bus. The SD bus starts in one-bit mode, but the host device may issue a command to switch to the four-bit mode, if the SD card supports it. For various card types, support for the four-bit SD bus is either optional or mandatory ...

4. Comparison of memory cards - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_memory_cards

   X (requires an eXternal adapter) – Technically the same as E, but such adapter usually consists of 2 parts: a pseudo-card with pin routing and physical enclosure size that perfectly match the target slot and a break-out box (a card reader) that holds a real card. Such adapter is the least comfortable to use.

5. Card reader - Wikipedia

   en.wikipedia.org/wiki/Card_reader

   A card reader is a data input device that reads data from a card-shaped storage medium and provides the data to a computer. Card readers can acquire data from a card via a number of methods, including: optical scanning of printed text or barcodes or holes on punched cards, electrical signals from connections made or interrupted by a card's punched holes or embedded circuitry, or electronic ...

6. Memory card - Wikipedia

   en.wikipedia.org/wiki/Memory_card

   A memory card is an electronic data storage device used for storing digital information, typically using flash memory. These are commonly used in digital portable electronic devices, such as Digital cameras as well as in many early games consoles such as the Nintendo Wii. They allow adding memory to such devices using a card in a socket instead ...

7. xD-Picture Card - Wikipedia

   en.wikipedia.org/wiki/XD-Picture_Card

   2009. The xD-Picture Card is an obsolete form of flash memory card, used in digital cameras made by Olympus, Fujifilm, and Kodak during the 2000s. The xD in the xD-Picture Card stands for eXtreme Digital. xD cards were manufactured with capacities of 16 MB [a] up to 2 GB. [b] [1] The standard was phased out in the late 2000s in favour of the SD ...