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  2. USB mass storage device class - Wikipedia

    en.wikipedia.org/wiki/USB_mass_storage_device_class

    The USB mass storage device class (also known as USB MSC or UMS) is a set of computing communications protocols, specifically a USB Device Class, defined by the USB Implementers Forum that makes a USB device accessible to a host computing device and enables file transfers between the host and the USB device. To a host, the USB device acts as an ...

  3. SD card - Wikipedia

    en.wikipedia.org/wiki/SD_card

    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.

  4. USB communications - Wikipedia

    en.wikipedia.org/wiki/USB_communications

    Data stage (optional): This contains the information described (in the case of a host-to-device transfer) or requested (in the case of a device-to-host transfer) by the setup stage. This may consist of multiple transactions, and is terminated under multiple conditions: [15]

  5. Memory card reader - Wikipedia

    en.wikipedia.org/wiki/Memory_card_reader

    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 ...

  6. ExpressCard - Wikipedia

    en.wikipedia.org/wiki/ExpressCard

    Originally developed by the Personal Computer Memory Card International Association (), the ExpressCard standard is maintained by the USB Implementers Forum ().The host device supports PCI Express, USB 2.0 (including Hi-Speed), and USB 3.0 (SuperSpeed) [2] (ExpressCard 2.0 only) connectivity through the ExpressCard slot; cards can be designed to use any of these modes.

  7. USB On-The-Go - Wikipedia

    en.wikipedia.org/wiki/USB_On-The-Go

    The USB OTG and Embedded Host Supplement to the USB 2.0 specification introduced three new communication protocols: . Attach Detection Protocol (ADP): Allows an OTG device, embedded host or USB device to determine attachment status in the absence of power on the USB bus, enabling both insertion-based behavior and the capability to display attachment status.