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The limit to device power draw is stated in terms of a unit load which is 100 mA for USB 2.0, or 150 mA for SuperSpeed (i.e. USB 3.x) devices. Low-power devices may draw at most 1 unit load, and all devices must act as low-power devices before they are configured.
All devices must act as low-power devices when starting out as unconfigured. For USB devices up to USB 2.0 a unit load is 100 mA (or 500 mW), while USB 3.0 defines a unit load as 150 mA (750 mW). Full-featured USB-C can support low-power devices with a unit load of 250 mA (or 1250 mW).
The written USB 3.0 specification was released by Intel and its partners in August 2008. The first USB 3.0 controller chips were sampled by NEC in May 2009, [4] and the first products using the USB 3.0 specification arrived in January 2010. [5] USB 3.0 connectors are generally backward compatible, but include new wiring and full-duplex operation.
A flash drive (also thumb drive [US], memory stick [UK], and pen drive / pendrive elsewhere) [ 1 ][ note 1 ] is a data storage device that includes flash memory with an integrated USB interface. A typical USB drive is removable, rewritable, and smaller than an optical disc, and usually weighs less than 30 g (1 oz).
All models support USB memory devices; flash drives and external hard drives are both automatically recognized. However, they must be formatted with the FAT32 file system. [29] Earlier systems supported up to four USB 2.0 ports at the front (20 and 60 GB models, as well as the NTSC 80 GB), but the 40 GB and 80 GB PAL models only have two USB ...
A deprecated [ 2 ] SuperSpeed USB 5 Gbit/s packaging logo. Universal Serial Bus 3.0 (USB 3.0), marketed as SuperSpeed USB, is the third major version of the Universal Serial Bus (USB) standard for interfacing computers and electronic devices. It was released in November 2008.