View source for Memory card reader

{{Short description|Device for reading data on a memory card}}
{{More citations needed|date=November 2013}}
[[File:Kingston FCR-HS219-1 20110523.jpg|thumb|Typical modern memory card reader, compatible with many common formats]]
[[File:SanDisk Extreme Pro SD UHS-II USB-C Reader.jpg|thumb|upright|[[USB-C]] UHS-II SD card reader]]
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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 card|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 [[Computer printer|printers]] and [[Smartphone]]s have a built-in card reader, as do many [[laptop]]s and the majority of [[Tablet computer]]s.

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.

Memory card readers, unlike smartphones, telephones and other devices, such as cameras and digital cameras, allow formatting in a file system other than FAT (FAT16, FAT32, exFAT) to NTFS in Windows, ext, ext2, ext3 in Linux or HFS, HFS + for Mac OS. Smartphones or other devices like cameras format them only in FAT. Internal card readers are usually connected to internal USB 1.1 / 2.0 / 3.x ports

The number of compatible memory cards varies from reader to reader and can include more than 20 different types. 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.g. 9-in-1) and series card reader (e.g. 4x SD-only).

Some kinds of memory cards with their own USB functions do not need the card reader, such as the Intelligent Stick memory card, which can plug directly into a USB slot.

The [[Universal Serial Bus#Device classes|USB device class]] used is {{mono|0x08}}.

Modern UDMA-7 CompactFlash Cards and UHS-I Secure Digital cards provide data rates in excess of 89 [[Megabyte|MB]]/[[second|s]] and up to 145 MB/s,<ref>{{Cite web |url=http://pietrzyk.us/media-card-study/ |title=UDMA-7/UHS-1 Media Card Study &#124; pietrzyk.us |access-date=2013-11-24 |archive-url=https://web.archive.org/web/20170211080838/http://pietrzyk.us/media-card-study/ |archive-date=2017-02-11 |url-status=dead }}</ref> when used with memory card readers capable of USB 3.0 data transfer rates.<ref>{{Cite web |url=http://pietrzyk.us/usb-3-0-cf-card-reader-study/ |title=USB 3.0 CF Card Reader Study &#124; pietrzyk.us |access-date=2013-11-24 |archive-url=https://web.archive.org/web/20161229054617/http://pietrzyk.us/usb-3-0-cf-card-reader-study/ |archive-date=2016-12-29 |url-status=dead }}</ref> As of 2011, Secure Digital memory cards received an additional option of a UHS-II bus interface. It increased the maximum data transfer speed to 312 MB/s.<ref>{{cite web |url=https://tenpire.com/beginners-guide-to-choosing-microsd-and-sd-memory-cards/ |title=Beginners Guide To Choosing MicroSD And SD Memory Cards |website=TenPire |date=2019-05-13 |archive-url=https://web.archive.org/web/20190514184350/https://tenpire.com/beginners-guide-to-choosing-microsd-and-sd-memory-cards/ |archive-date=2019-05-14 |first=Atko |last=Von |access-date=2019-05-14 |url-status=dead }}</ref>

<gallery>
SanDisk-memory-card-reader.jpg|USB card readers like this one typically implement the [[USB mass storage device class]]
Cfcrusb2.jpg|Generic [[CompactFlash]] card reader with high-speed storage via USB2.0
FDD-Cardreader.jpg|Cardreader combined with [[floppy disk]] drive
NV-PE150PSU CF Card Reader 91689 (cropped).jpg|[[PCIe]] 1x [[eSATAp]] controller card with [[CompactFlash]] memory card reader
</gallery>

== See also ==
{{Commons category|Memory card readers}}
* [[Card reader]]

==References==
{{reflist}}

{{Memory cards}}

{{DEFAULTSORT:Memory Card Reader}}
[[Category:Solid-state computer storage media]]
[[Category:USB]]