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A memory card reader is a device for accessing the data on a memory card such as a CompactFlash (CF), Secure Digital (SD) or MultiMediaCard (MMC). Most card readers also offer write capability, and together with the card, this can function as a pen drive .
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 ...
XM (requires an eXternal electro-mechanical adapter) – Technically the same as EM, 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.
After determining that the SD card supports it, the host device can also command the SD card to switch to a higher transfer speed. Until determining the card's capabilities, the host device should not use a clock speed faster than 400 kHz. SD cards other than SDIO (see below) have a "Default Speed" clock rate of 25 MHz.
Other external or dockable peripherals that have expandable removable media capabilities, usually via a USB port or memory card reader. USB hubs; Wired or wireless printers; Network routers, access points and switches; Using removable media can pose some computer security risks, including viruses, data theft and the introduction of malware. [6]
New products of Sony (previously only using Memory Stick) and Olympus (previously only using XD-Card) have been offered with an additional SD-Card slot beginning in 2010. [23] Effectively the format war has turned in SD-Card's favor. [24] [25] [26
Three different Micro Center-branded digital media, showing a USB flash drive, an SD card, and a Micro-SD card, all having a capacity of 8 GiB, next to a U.S. 5-cent coin for size comparison. Flash memory cards, e.g., Secure Digital cards, are available in various formats and capacities, and are used by many consumer devices. However, while ...
The physical dimensions of Microdrive were 1.65" × 1.42" × 0.197" (42.0 mm × 36.0 mm × 5.0 mm) and conformed to CompactFlash Type II card standard. A second generation of Microdrive was announced by IBM in June 2000 with increased capacities at 512 MB and 1 GB, with the 512 MB model costing $399 and the 1 GB model costing $499.