Internal / External Media Card Reader
A memory card reader is a device, typically having a USB interface, for accessing the data on a memory card such as aCompactFlash (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 multi card reader is used for communication with more than one type of flash memory card. Multi card readers do not have built-in memory capacity, but are able to accept multiple types and styles of memory cards.