23) Multi Card Reader PC (SM, SD, MS (Memory Stick), Memory Stick PRO (MS-PRO), MS-Duo, microSD, miniSD, Multi Media Card (MMC), eSATA)

23) Multi Card Reader PC (SM, SD, MS (Memory Stick), Memory Stick PRO (MS-PRO), MS-Duo, microSD, miniSD, Multi Media Card (MMC), eSATA)
- A memory card reader is a device for accessing data on a memory card such as CompactFlash (CF), Secure Digital (SD) or MultiMediaCard (MMC). Most card readers also offer writing capability, and along with the card, this can work as a pen drive.
Some printers and smartphones have a built-in card reader, as do most personal computers and most tablet computers.
A multiple card reader is used for communication with more than one type of flash memory card. Multiple card readers do not have built-in memory capacity, but can accept multiple types and styles of memory cards.
The number of compatible memory cards varies from one reader to another and can include more than 20 different types. The number of different memory cards that a multiple card reader can accept is expressed as x-in-1, where x is a number that indicates the number of memory cards accepted, such as 35 in 1. There are three categories of card readers sorted by type and number of card slots: individual card reader (for example, 1x SD-only), multiple card reader (for example 9-in-1) and serial card reader (for example, 4x SD-only )
Some types of memory cards with their own USB functions do not need the card reader, such as the Intelligent Stick memory card, which can be connected directly to a USB slot.
The USB device class used is 0x08.
Modern UDMA-7 CompactFlash and UHS-I Secure Digital cards provide data rates greater than 89 MB / s and up to 145 MB / s, [1] when used with memory card readers with USB 3.0 data transfer capability.