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USB ports and connectors are often color-coded to distinguish their different functions and USB versions. These colors are not part of the USB specification and can vary between manufacturers; for example, the USB 3.0 specification mandates appropriate color-coding while it only recommends blue inserts for Standard-A USB 3.0 connectors and plugs.
As of April 2011, the Inspiron and Dell XPS series were available with USB 3.0 ports, and, as of May 2012, the Dell Latitude laptop series were as well; yet the USB root hosts failed to work at SuperSpeed under Windows 8.
Additionally, USB ports are color-coded according to the specification and data transfer speed, e.g. USB 1.x and 2.x ports are usually white or black, and USB 3.0 ones are blue. SuperSpeed+ connectors are teal in color. [2] FireWire ports used with video equipment (among other devices) can be either 4-pin or 6-pin. The two extra conductors in ...
Standard USB hub ports can provide from the typical 500 mA/2.5 W of current, only 100 mA from non-hub ports. USB 3.0 and USB On-The-Go supply 1.8 A/9.0 W (for dedicated battery charging, 1.5 A/7.5 W full bandwidth or 900 mA/4.5 W high bandwidth), while FireWire can in theory supply up to 60 watts of power, although 10 to 20 watts is more typical.
Dell Inspiron 3891 is newer than 3880 and 3881, with support for 11th gen Intel Core i5/i7, as well as 10th gen Intel CPUs. There were similar specs, but the 3891 has two USB 2.0 ports, one USB 3.2 ports, and one USB-C port, which the Dell Inspiron 3880 and 3881 lacked.
I/O ports: 2 USB 3.0, 1 USB 2.0, 1 eSATA, 1 HDMI port, 1 VGA (D-Sub) port, 4-in-1 SD Card Reader, 1 Ethernet port, 1 headphone, 1 microphone jack, 1 security lock, 1 power adapter port. Dimensions and weight: 2.6 kg with battery, 376 mm width, 260.2 mm depth, 35.3 mm rear to 30.7 mm front height
Differences include that the 600M does not work with the Dell D-Dock, and the case styling is slightly different. The motherboards, screens, and hard drive caddies are all physically interchangeable. The Latitude D600 used a PA-10/PA-12 charger and came with a DVD drive, 2 x USB, 1 x TV, 1 x network, 1 x parallel, 1 x serial, and 1 monitor output.
Because the USB port connectors on a computer housing are often closely spaced, plugging a flash drive into a USB port may block an adjacent port. Such devices may carry the USB logo only if sold with a separate extension cable. Such cables are USB-compatible but do not conform to the USB standard. [35] [36]