USB Vs. SD Speed ​​​​

Fast transfer speeds are critical to efficiency in professions such as digital photography and video encoding, as files can be several gigabytes in size. Secure Digital (SD) and Universal Serial Bus (USB) storage devices have comparable speeds​​, but new versions of these can transfer very large files in seconds.
Types
As of 2010, USB has three versions: 1.1, 2.0 and 3.0, according to EverythingUSB. SD cards come in regular, Xtreme (SDXC) and high capacity (SDHC). The two fastest standards of each, SDXC and USB 3.0, write at an average of 100 megabytes per second and 300 megabytes per second, respectively.

Considerations
transfer rates for SD media are highly volatile because it is based on electrical charges. To a lesser extent, USB devices have variable speeds ​​, but mainly due to differences in quality from manufacturers.
Potential
In 2012, the SD Card Association plans to pass a new SD standard that would increase recording speeds to those comparable – about 300MB/sec – with USB 3.0, according to Engadget

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