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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 ...
Integrated USB connector – The SanDisk SD Plus product can be plugged directly into a USB port without needing a USB card reader. [147] Other companies introduced comparable products, such as the Duo SD product of OCZ Technology and the 3 Way (microSDHC, SDHC and USB) product of A-DATA , which was available in 2008 only.
A USB card reader like this one will typically use the USB mass storage device class. 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.
The card is composed of two detachable parts, much like a microSD card with an SD adapter. The small memory card fits directly in a USB port and has MMC-compatible electrical contacts. With an included electromechanical adapter, it can also fit in traditional MMC and SD card readers.
At first intended for magnetic and optical drives, it has been extended to support flash drives and SD card readers. The ability to boot a write-locked SD card with a USB adapter is particularly advantageous for maintaining the integrity and non-corruptible, pristine state of the booting medium.
It not only has two high-speed USB 3.2 ports but also a standard USB 2.0 port, an HDMI port, an SD card reader and even a 3.5mm audio jack (something you won't find on a much more expensive Macbook).
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