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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. Some printers and Smartphones have a built-in card reader, as do many laptops and the ...
Although many personal computers accommodate SD cards as an auxiliary storage device using a built-in slot, or can accommodate SD cards by means of a USB adapter, SD cards cannot be used as the primary hard disk through the onboard ATA controller, because none of the SD card variants support ATA signalling.
The Sansa e100 series has a monochrome display with a blue backlight, FM tuner with 20 presets, SRS WOW technology, an SD card slot supporting cards up to 2 GB, an internal memory of 512 MB (e130) or 1 GB (e140), and a single AAA battery for power. It supports MP3, WMA and Audible file formats. The e140 was also known as the SDMX2.
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.
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 ...
As some newer card types are smaller, they can be used directly in a CF card slot with an adapter. Formats that can be used this way include SD/MMC, Memory Stick Duo, xD-Picture Card in a Type I slot and SmartMedia in a Type II slot, as of 2005. Some multi-card readers use CF for I/O as well.
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