USB 3.0 - Wikipedia USB 3.0 `` SuperSpeed '' redirects here. For other uses, see Super Speed. USB 3.0 SuperSpeed USB logo Type USB Production history Designed November 2008 Manufacturer USB 3.0 Promoter Group ( Hewlett - Packard, Intel, Microsoft, NEC, ST - Ericsson, and Texas Instruments ) Superseded USB 2.0 Hi - Speed Superseded by USB 3.2 ( September 2017 ) General specifications Width 12 mm ( A plug ), 8 mm ( B plug ), 12.2 mm ( Micro-A & Micro-B plugs ) Height 4.5 mm ( A plug ), 10.44 mm ( B plug ), 1.8 mm ( Micro-A & Micro-B plugs ) Pins 9 Electrical Max. current 900 mA Data Data signal Yes Bitrate 5 Gbit / s ( 625 MB / s ) 10 Gbit / s ( 1250 MB / s ) 20 Gbit / s ( 2500 MB / s ) USB 3.0 is the third major version of the Universal Serial Bus ( USB ) standard for interfacing computers and electronic devices. Among other improvements, USB 3.0 adds the new transfer rate referred to as SuperSpeed USB ( SS ) that can transfer data at up to 5 Gbit / s ( 625 MB / s ), which is about 10 times as fast as the USB 2.0 standard. Manufacturers are recommended to distinguish USB 3.0 connectors from their USB 2.0 counterparts by blue color - coding of the Standard - A receptacles and plugs, and by the initials SS. USB 3.1, released in July 2013, is the successor standard that replaces the USB 3.0 standard. USB 3.1 preserves the existing SuperSpeed transfer rate, giving it the new label USB 3.1 Gen 1, while defining a new SuperSpeed+ transfer mode, called USB 3.1 Gen 2 which can transfer data at up to 10 Gbit / s over the existing USB - type - A and USB - C connectors ( 1250 MB / s, twice the rate of USB 3.0 ). USB 3.2, released in September 2017, replaces the USB 3.1 standard. It preserves existing USB 3.1 SuperSpeed and SuperSpeed+ data modes and introduces two new SuperSpeed+ transfer modes over the USB - C connector using two - lane operation, with data rates of 10 and 20 Gbit / s ( 1250 and 2500 MB / s ). Contents 1 Overview 1.1 Architecture and features 1.2 Data transfer and synchronization 1.3 Data encoding 1.4 Power and charging 2 Availability 2.1 Adding to existing equipment 2.2 Adoption 3 Issues 3.1 Speed and compatibility 3.2 Radio frequency interference 4 Connectors 4.1 Pinouts 4.2 Backward compatibility 5 USB 3.1 6 USB 3.2 7 See also 8 References 9 External links Overview The USB 3.0 specification is similar to USB 2.0, but with many improvements and an alternative implementation. Earlier USB concepts such as endpoints and the four transfer types ( bulk, control, isochronous and interrupt ) are preserved but the protocol and electrical interface are different. The specification defines a physically separate channel to carry USB 3.0 traffic. The changes in this specification make improvements in the following areas : Transfer speed -- USB 3.0 adds a new transfer type called SuperSpeed or SS, 5 Gbit / s ( electrically, it is more similar to PCI Express 2.0 and SATA than USB 2.0 ) Increased bandwidth -- USB 3.0 uses two unidirectional data paths instead of only one : one to receive data and the other to transmit Power management -- U0 to U3 link power management states are defined Improved bus use -- a new feature is added ( using packets NRDY and ERDY ) to let a device asynchronously notify the host of its readiness, with no need for polling Support for rotating media -- the bulk protocol is updated with a new feature called Stream Protocol that allows a large number of logical streams within an Endpoint USB 3.0 has transmission speeds of up to 5 Gbit / s, about ten times faster than USB 2.0 ( 480 Mbit / s ) even without considering that USB 3.0 is full duplex whereas USB 2.0 is half duplex. This gives USB 3.0 a potential total bidirectional bandwidth twenty times greater than USB 2.0. Architecture and features Front view of a Standard - A USB 3.0 connector, showing its front row of four pins for the USB 1. x / 2.0 backward compatibility, and a second row of five pins for the new USB 3.0 connectivity. The plastic insert is in the USB 3.0 standard blue color known as Pantone 300C. In USB 3.0, dual - bus architecture is used to allow both USB 2.0 ( Full Speed, Low Speed, or High Speed ) and USB 3.0 ( SuperSpeed ) operations to take place simultaneously, thus providing backward compatibility. The structural topology is the same, consisting of a tiered star topology with a root hub at level 0 and hubs at lower levels to provide bus connectivity to devices. Data transfer and synchronization The SuperSpeed transaction is initiated by a host request, followed by a response from the device. The device either accepts the request or rejects it ; if accepted, the device sends data or accepts data from the host. If the endpoint is halted, the device responds with a STALL handshake. If there is lack of buffer space or data, it responds with a Not Ready ( NRDY ) signal to tell the host that it is not able to process the request. When the device is ready, sends an Endpoint Ready ( ERDY ) to the host which then reschedules the transaction. The use of unicast and the limited amount of multicast packets, combined with asynchronous notifications, enables links that are not actively passing packets to be put into reduced power states, which allows better power management. Data encoding The `` SuperSpeed '' bus provides for a transfer mode at a nominal rate of 5.0 Gbit / s, in addition to the three existing transfer modes. Accounting for the encoding overhead, the raw data throughput is 4 Gbit / s, and the specification considers it reasonable to achieve 3.2 Gbit / s ( 400 MB / s ) or more in practice. All data is sent as a stream of eight - bit ( one - byte ) segments that are scrambled and converted into 10 - bit symbols via 8b / 10b encoding ; this helps the receiver to decode correctly even in the presence of electromagnetic interference ( EMI ). Scrambling is implemented using a free - running linear feedback shift register ( LFSR ). The LFSR is reset whenever a COM symbol is sent or received. Unlike previous standards, the USB 3.0 standard does not specify a maximum cable length, requiring only that all cables meet an electrical specification : for copper cabling with AWG 26 wires, the maximum practical length is 1.3 meters ( 4.3 ft ). Power and charging As with earlier versions of USB, USB 3.0 provides power at 5 volts nominal. The available current for low - power ( one unit load ) SuperSpeed devices is 150 mA, an increase from the 100 mA defined in USB 2.0. For high - power SuperSpeed devices, the limit is six unit loads or 900 mA ( 4.5 W ), almost twice USB 2.0 's 500 mA. The term `` available current '' can be misunderstood. It implies that if a low power device or a USB2 device is connected to a USB3 port it can only draw 150 mA or 500 mA from that port. However, the available current for any USB device plugged into a USB3 port is 900 mA ( unless it is charging port compliant ) as defined by the USB3 spec. The actual current draw is determined by the device capability. The Vbus, pin 1, and Ground, pin 4, are the same for USB 1, 2, or 3. A USB2 HDD with 2 USB2 connectors needing a total of 800 mA will draw full power from a single USB3 port. A USB2 phone will probably charge faster since 900 mA is `` available '' to it. USB 3.0 ports may implement other USB specifications for increased power, including the USB Battery Charging Specification for up to 1.5 A or 7.5 W, or, in the case of USB 3.1, the USB Power Delivery specification for charging the host device up to 100 W. Availability A USB 3.0 four - port hub, using a VIA Technologies chipset The USB 3.0 Promoter Group announced on 17 November 2008 that the specification of version 3.0 had been completed and had made the transition to the USB Implementers Forum ( USB - IF ), the managing body of USB specifications. This move effectively opened the specification to hardware developers for implementation in future products. The first USB 3.0 consumer products were announced and shipped by Buffalo Technology in November 2009, while the first certified USB 3.0 consumer products were announced on 5 January 2010, at the Las Vegas Consumer Electronics Show ( CES ), including two motherboards by ASUS and Gigabyte Technology. Manufacturers of USB 3.0 host controllers include, but are not limited to, Renesas Electronics, Fresco Logic, ASMedia Technology, Etron, VIA Technologies, Texas Instruments, NEC and Nvidia. As of November 2010, Renesas and Fresco Logic have passed USB - IF certification. Motherboards for Intel 's Sandy Bridge processors have been seen with Asmedia and Etron host controllers as well. On 28 October 2010, Hewlett - Packard released the HP Envy 17 3D featuring a Renesas USB 3.0 host controller several months before some of their competitors. AMD worked with Renesas to add its USB 3.0 implementation into its chipsets for its 2011 platforms. At CES2011, Toshiba unveiled a laptop called `` Toshiba Qosmio X500 '' that included USB 3.0 and Bluetooth 3.0, and Sony released a new series of Sony VAIO laptops that would include USB 3.0. 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. On 11 June 2012, Apple announced new MacBook Airs and MacBook Pro with USB 3.0. Adding to existing equipment A USB 3.0 controller in form of a PCI Express expansion card Side connectors on a laptop computer. Left to right : USB 3.0 host, VGA connector, DisplayPort connector, USB 2.0 host. Note the additional pins on the top side of the USB 3.0 port. In laptop computers that lack USB 3.0 ports but have an ExpressCard slot, USB 3.0 ports can be added by using an ExpressCard - to - USB 3.0 adapter. Although the ExpressCard port itself is powered from a 3.3 V line, the connector also has a USB 2.0 port available to it ( some express cards actually use the USB 2.0 interface rather than the true express card port ). However, this USB 2.0 port is only capable of supplying the power for one USB 3.0 port. Where multiple ports are provided on the express card, additional power will need to be provided. Additional power for multiple ports on a laptop PC may be derived in the following ways : Some ExpressCard - to - USB 3.0 adapters may connect by a cable to an additional USB 2.0 port on the computer, which supplies additional power. The ExpressCard may have a socket for an external power supply. If the external device has an appropriate connector, it can be powered by an external power supply. USB 3.0 port provided by an ExpressCard - to - USB 3.0 adapter may be connected to a separately - powered USB 3.0 hub, with external devices connected to that USB 3.0 hub. On the motherboards of desktop PCs which have PCI Express ( PCIe ) slots ( or the older PCI standard ), USB 3.0 support can be added as a PCI Express expansion card. In addition to an empty PCIe slot on the motherboard, many `` PCI Express to USB 3.0 '' expansion cards must be connected to a power supply such as a Molex adapter or external power supply, in order to power many USB 3.0 devices such as mobile phones, or external hard drives that have no power source other than USB ; as of 2011, this is often used to supply two to four USB 3.0 ports with the full 0.9 A ( 4.5 W ) of power that each USB 3.0 port is capable of ( while also transmitting data ), whereas the PCI Express slot itself can not supply the required amount of power. If faster connections to storage devices are the reason to consider USB 3.0, an alternative is to use eSATAp, possibly by adding an inexpensive expansion slot bracket that provides an eSATAp port ; some external hard disk drives provide both USB ( 2.0 or 3.0 ) and eSATAp interfaces. To ensure compatibility between motherboards and peripherals, all USB - certified devices must be approved by the USB Implementers Forum ( USB - IF ). At least one complete end - to - end test system for USB 3.0 designers is available on the market. Adoption The USB Promoter Group announced the release of USB 3.0 on November 2008. On 5 January 2010, USB - IF announced the first two certified USB 3.0 motherboards, one by Asus and one by Gigabyte. Previous announcements included Gigabyte 's October 2009 list of seven P55 chipset USB 3.0 motherboards, and an ASUS motherboard that was cancelled before production. Commercial controllers were expected to enter into volume production in the first quarter of 2010. On 14 September 2009, Freecom announced a USB 3.0 external hard drive. On 4 January 2010, Seagate announced a small portable HDD bundled with an additional USB 3.0 ExpressCard, targeted for laptops ( or desktops with ExpressCard slot addition ) at the CES in Las Vegas Nevada. The Linux kernel mainline contains support for USB 3.0 since version 2.6. 31, which was released in September 2009. FreeBSD supports USB 3.0 since version 8.2, which was released in February 2011. Windows 8 was the first Microsoft operating system to offer built in support for USB 3.0. In Windows 7 support was not included with the initial release of the operating system. However, drivers that enable support for Windows 7 are available through websites of hardware manufacturers. Intel released its first chipset with integrated USB 3.0 ports in 2012 with the release of the Panther Point chipset. Some industry analysts have claimed that Intel was slow to integrate USB 3.0 into the chipset, thus slowing mainstream adoption. These delays may be due to problems in the CMOS manufacturing process, a focus to advance the Nehalem platform, a wait to mature all the 3.0 connections standards ( USB 3.0, PCIe 3.0, SATA 3.0 ) before developing a new chipset, or a tactic by Intel to favor its new Thunderbolt interface. Apple, Inc. announced laptops with USB 3.0 ports on 11 June 2012, nearly four years after USB 3.0 was finalized. AMD began supporting USB 3.0 with its Fusion Controller Hubs in 2011. Samsung Electronics announced support of USB 3.0 with its ARM - based Exynos 5 Dual platform intended for handheld devices. Issues Speed and compatibility Various early USB 3.0 implementations widely used the NEC / Renesas μD72020x family of host controllers, which are known to require a firmware update to function properly with some devices. A factor affecting the speed of USB storage devices ( more evident with USB 3.0 devices, but also noticeable with USB 2.0 ones ) is that the USB Mass Storage Bulk - Only Transfer ( BOT ) protocol drivers are generally slower than the USB Attached SCSI protocol ( UAS ( P ) ) drivers. On some old ( 2009 -- 2010 ) Ibex Peak - based motherboards, the built - in USB 3.0 chipsets are connected by default via a 2.5 GT / s PCI Express lane of the PCH, which then did not provide full PCI Express 2.0 speed ( 5 GT / s ), so it did not provide enough bandwidth even for a single USB 3.0 port. Early versions of such boards ( e.g. the Gigabyte Technology P55A - UD4 or P55A - UD6 ) have a manual switch ( in BIOS ) that can connect the USB 3.0 chip to the processor ( instead of the PCH ), which did provide full - speed PCI Express 2.0 connectivity even then, but this meant using fewer PCI Express 2.0 lanes for the graphics card. However, newer boards ( e.g. Gigabyte P55A - UD7 or the Asus P7P55D - E Premium ) used a channel bonding technique ( in the case of those boards provided by a PLX PEX8608 or PEX8613 PCI Express switch ) that combines two PCI Express 2.5 GT / s lanes into a single PCI Express 5 GT / s lane ( among other features ), thus obtaining the necessary bandwidth from the PCH. Radio frequency interference USB 3.0 devices and cables may interfere with wireless devices operating in the 2.4 GHz ISM band. This may result in a drop in throughput or complete loss of response with Bluetooth and Wi - Fi devices. Various strategies can be applied to resolve the problem, ranging from simple solutions such as increasing the distance of USB 3.0 devices from Wi - Fi routers and Bluetooth devices, to applying additional shielding around internal computer components. There were some devices ( for example Vivo Xplay 3S ) which were promised to come with USB 3.0, however ultimately did n't ship with USB 3.0, because of manufacturer 's inability to resolve the electromagnetic interference caused by the USB 3.0. Connectors See also : USB § Connectors USB 3.0 Standard - A receptacle ( top, in the blue color `` Pantone 300C '' ), Standard - B plug ( middle ), and Micro-B plug ( bottom ) A USB 3.0 Standard - A receptacle accepts either a USB 3.0 Standard - A plug or a USB 2.0 Standard - A plug. Conversely, it is possible to plug a USB 3.0 Standard - A plug into a USB 2.0 Standard - A receptacle. This is a principle of backward compatibility. The Standard - A is used for connecting to a computer port, at the host side. A USB 3.0 Standard - B receptacle accepts either a USB 3.0 Standard - B plug or a USB 2.0 Standard - B plug. Backward compatibility applies to connecting a USB 2.0 Standard - B plug into a USB 3.0 Standard - B receptacle. However, it is not possible to plug a USB 3.0 Standard - B plug into a USB 2.0 Standard - B receptacle, due to a physically larger connector. The Standard - B is used at the device side. Since USB 2.0 and USB 3.0 ports may coexist on the same machine and they look similar, the USB 3.0 specification recommends that the Standard - A USB 3.0 receptacle have a blue insert ( Pantone 300C color ). The same color - coding applies to the USB 3.0 Standard - A plug. USB 3.0 also introduced a new Micro-B cable plug, which consists of a standard USB 1. x / 2.0 Micro-B cable plug, with an additional 5 - pin plug `` stacked '' inside it. That way, the USB 3.0 Micro-B host connector preserved its backward compatibility with the USB 1. x / 2.0 Micro-B cable plugs. However, it is not possible to plug a USB 3.0 Micro-B plug into a USB 2.0 Micro-B receptacle, due to a physically larger connector. To be perfectly clear, you can run a device with a USB3 Micro-B socket on a USB2 Micro-B cable at USB2 speeds. Pinouts USB 3.0 Standard - A plug ( top ) and receptacle ( bottom ), with annotated pins The connector has the same physical configuration as its predecessor but with five more pins. The VBUS, D −, D+, and GND pins are required for USB 2.0 communication. The additional USB 3.0 pins are two differential pairs and one ground ( GND_DRAIN ). The two additional differential pairs are for SuperSpeed data transfer ; they are used for full duplex SuperSpeed signaling. The GND_DRAIN pin is for drain wire termination and to control EMI and maintain signal integrity. USB 3.0 connector pinouts Pin Color Signal name Description A connector B connector Shell N / A Shield Metal housing Red VBUS Power White D − USB 2.0 differential pair Green D+ Black GND Ground for power return 5 Blue StdA_SSRX − StdB_SSTX − SuperSpeed transmitter differential pair 6 Yellow StdA_SSRX+ StdB_SSTX+ 7 N / A GND_DRAIN Ground for signal return 8 Purple StdA_SSTX − StdB_SSRX − SuperSpeed receiver differential pair 9 Orange StdA_SSTX+ StdB_SSRX+ The USB 3.0 Powered - B connector has two additional pins for power and ground supplied to the device. 10 N / A DPWR Power provided to device ( Powered - B only ) 11 DGND Ground for DPWR return ( Powered - B only ) Backward compatibility USB Micro-B USB 2.0 vs USB Micro-B SuperSpeed ( USB 3.0 ) USB 3.0 and USB 2.0 ( or earlier ) Type - A plugs and receptacles are designed to interoperate. USB 3.0 Type - B receptacles, such as those found on peripheral devices, are larger than in USB 2.0 ( or earlier versions ), and accept both the larger USB 3.0 Type - B plug and the smaller USB 2.0 ( or earlier ) Type - B plug. USB 3.0 Type B plugs are larger than USB 2.0 ( or earlier ) Type - B plugs ; therefore, USB 3.0 Type - B plugs can not be inserted into USB 2.0 ( or earlier ) Type - B receptacles. Micro USB 3.0 ( Micro-B ) plug and receptacle are intended primarily for small portable devices such as smartphones, digital cameras and GPS devices. The Micro USB 3.0 receptacle is backward compatible with the Micro USB 2.0 plug. A receptacle for eSATAp, which is an eSATA / USB combo, is designed to accept USB Type - A plugs from USB 2.0 ( or earlier ), so it also accepts USB 3.0 Type - A plugs. USB 3.1 In January 2013 the USB group announced plans to update USB 3.0 to 10 Gbit / s ( 1.25 GB / s ). The group ended up creating a new USB specification, USB 3.1, which was released on 31 July 2013, replacing the USB 3.0 standard. The USB 3.1 specification takes over the existing USB 3.0 's SuperSpeed USB transfer rate, also referred to as USB 3.1 Gen 1, and introduces a faster transfer rate called SuperSpeed USB 10 Gbps, referred to as USB 3.1 Gen 2, putting it on par with a single first - generation Thunderbolt channel. The new mode 's logo features a caption stylized as SUPERSPEED+. The USB 3.1 Gen 2 standard increases the maximum data signaling rate to 10 Gbit / s ( 1.25 GB / s ), double that of SuperSpeed USB, and reduces line encoding overhead to just 3 % by changing the encoding scheme to 128b / 132b. The first USB 3.1 Gen 2 implementation demonstrated real - world transfer speeds of 7.2 Gbit / s. The USB 3.1 standard is backward compatible with USB 3.0 and USB 2.0. It defines the following transfer modes : USB 3.1 Gen 1 - SuperSpeed, 5 Gbit / s ( 0.625 GB / s ) data signaling rate over 1 lane using 8b / 10b encoding, the same as USB 3.0. USB 3.1 Gen 2 - SuperSpeed+, new 10 Gbit / s ( 1.25 GB / s ) data rate over 1 lane using 128b / 132b encoding. USB 3.2 On 25 July 2017, a press release from the USB 3.0 Promoter Group detailed a pending update to the USB Type - C specification, defining the doubling of bandwidth for existing USB - C cables. Under the USB 3.2 specification, existing SuperSpeed certified USB - C 3.1 Gen 1 cables will be able to operate at 10 Gbit / s ( up from 5 Gbit / s ), and SuperSpeed+ certified USB - C 3.1 Gen 2 cables will be able to operate at 20 Gbit / s ( up from 10 Gbit / s ). The increase in bandwidth is a result of multi-lane operation over existing wires that were intended for flip - flop capabilities of the Type - C connector. The USB 3.2 standard is backward compatible with USB 3.1 / 3.0 and USB 2.0. It defines the following transfer modes : USB 3.2 Gen 1x1 - SuperSpeed, 5 Gbit / s ( 0.625 GB / s ) data signaling rate over 1 lane using 8b / 10b encoding, the same as USB 3.1 Gen 1 and USB 3.0. USB 3.2 Gen 1x2 - SuperSpeed+, new 10 Gbit / s ( 1.25 GB / s ) data rate over 2 lanes using 8b / 10b encoding. USB 3.2 Gen 2x1 - SuperSpeed+, 10 Gbit / s ( 1.25 GB / s ) data rate over 1 lane using 128b / 132b encoding, the same as USB 3.1 Gen 2. USB 3.2 Gen 2x2 - SuperSpeed+, new 20 Gbit / s ( 2.5 GB / s ) data rate over 2 lanes using 128b / 132b encoding. In May 2018, Synopsys demonstrated the first USB 3.2 connection, where a Windows PC was connected to a storage device, reaching a speed of 1.6 GB / s average. USB 3.2 is supported with the default Windows 10 USB drivers and in Linux Kernel 4.18. See also Computing portal Electronics portal Computer bus Extensible Host Controller Interface ( XHCI ) List of computer peripheral bus bit rates Mobile High - Definition Link References Jump up ^ `` Intel Universal Serial Bus ( USB ) Frequently Asked Questions ( FAQ ) ''. Intel Corporation. Retrieved 26 December 2014. Jump up ^ `` Universal Serial Bus Revision 3.1 Specification ''. usb.org. pp. 5 -- 20. Archived from the original ( ZIP ) on 12 April 2016. Retrieved 12 April 2016. Jump up ^ McFedries, Paul ( 2013 ). `` Connecting USB Devices ''. PCs for Grown - Ups : Getting the Most Out of Your Windows 8 Computer. Indianapolis : Que Publishing. ISBN 978 - 0 - 13 - 303501 - 8. Retrieved 2016 - 02 - 18. 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Jump up ^ Thomas Soderstrom ( 2009 - 12 - 09 ). `` New Motherboards From Asus And Gigabyte - USB 3.0 Performance : Two Solutions From Asus And Gigabyte ''. Tomshardware.com. Retrieved 2014 - 01 - 22. Jump up ^ Patrick Schmid and Achim Roos ( 2010 - 08 - 26 ). `` Gigabyte P55A - UD6 And UD7 ( NEC PD720200 ) - Not All USB 3.0 Implementations Are Created Equal ''. Tomshardware.com. Retrieved 2014 - 01 - 22. Jump up ^ PLX model numbers are from the P55A - UD7 manual, page 7 and ASUS P7P55D - E Premium manual p. 2 - 2 ; the P55A - UD7 has a block diagram on page 8 Jump up ^ USB 3.0 * Radio Frequency Interference Impact on 2.4 GHz Wireless Devices ( PDF ) Jump up ^ Lynn, Samara ( 2013 - 09 - 05 ). `` Wireless Witch : The Truth About USB 3.0 and Wi - Fi Interference ''. PCMag.com. Retrieved 2014 - 07 - 14. Jump up ^ 手机 厂商 阉割 Type - C 接口 的 真相 : 影响 手机 信号 ! Jump up ^ `` USB 3.0 Interface Bus, Cable Diagram ''. 100806 interfacebus.com Jump up ^ Total Phase Corporation. `` USB Background ''. Retrieved 2016 - 09 - 11. USB 3.0 includes a variant of the Standard - B connectors which has two additional conductors to provide power to USB adapters. Image courtesy of USB Implementers Forum Jump up ^ `` SuperSpeed USB ( USB 3.0 ) Performance to Double with New Capabilities '' ( PDF ) ( Press release ). Implementers Forum. 6 January 2013. Archived from the original ( PDF ) on 13 January 2013. Jump up ^ `` SuperSpeed USB 10 Gbps -- Ready for Development '' ( PDF ) ( Press release ). Hillsboro, Ore. July 31, 2013. Archived from the original ( PDF ) on 2016 - 01 - 27. Jump up ^ http://www.usb.org/developers/ssusb/USB_3_1_Language_Product_and_Packaging_Guidelines_FINAL.pdf Jump up ^ `` SuperSpeed USB 10 Gbps - Ready for Development ''. Rock Hill Herald. Archived from the original on 11 October 2014. Retrieved 31 July 2013. Jump up ^ `` Synopsys Demonstrates Industry 's First SuperSpeed USB 10 Gbps Platform - to - Platform Host - Device IP Data Transfer '' ( Press release ). Mountain View, California : Synopsys. 2013 - 12 - 10. Retrieved 2013 - 12 - 23. As measured by the Ellisys USB Explorer Protocol Analyzer, the IP realized 10 Gbps USB 3.1 effective data rates of more than 900 MBps between two Synopsys HAPS - 70 FPGA - based prototyping systems while using backward compatible USB connectors, cables and software. Jump up ^ Saunders, Brad ; Nardozza, Liz ( 25 July 2017 ). `` USB 3.0 Promoter Group Announces USB 3.2 Update '' ( PDF ). USB.org. USB 3.0 Promoter Group. Retrieved 27 July 2017. Jump up ^ Bright, Peter ( 26 July 2017 ). `` USB 3.2 will make your cables twice as fast... once you 've bought new devices ''. Ars Technica. Retrieved 27 July 2017. ^ Jump up to : `` Synopsys Shows World 's First USB 3.2 Demo With 20Gbps Speeds ''. Tom 's Hardware. 2018 - 05 - 25. Retrieved 2018 - 05 - 27. ^ Jump up to : Synopsys ( 2018 - 05 - 18 ), World 's First USB 3.2 Demonstration, retrieved 2018 - 05 - 27 Jump up ^ `` USB 3.2 Work Is On The Way For The Linux 4.18 Kernel - Phoronix ''. www.phoronix.com. Retrieved 2018 - 05 - 27. External links Wikimedia Commons has media related to USB 3.0. USB 3.0 Standard - A, Standard - B, Powered - B connectors pinouts, pinoutsguide.com Supreme Port : 4 Huge Changes Coming to USB, laptopmag.com -- CES 2014 report of a laptop docking port using a single USB 3.1 port to supply power, video and USB peripherals USB USB - IF specifications USB 3.0 USB 3.1 USB 3.2 USB Type - C USB On - The - Go USB device classes Mass storage Flash drive FlashCard Human interface Video Communications Other Enhanced mini-USB Ethernet over USB USB decoration USB hub USB adapter DC power delivery USB based Common External Power Supply ( for mobile phones ) USB Power Delivery PoweredUSB Not USB based AC adapter Power supply unit ( computer ) Universal Power Adapter for Mobile Devices ( IEEE P1823 ) DC Power supply for notebook computer ( IEC 62700 ) Technical and de facto standards for wired computer buses General System bus Front - side bus Back - side bus Daisy chain Control bus Address bus Bus contention Bus mastering Network on a chip Plug and play List of bus bandwidths Standards SS - 50 bus S - 100 bus Multibus Unibus VAXBI MBus STD Bus SMBus Q - Bus Europe Card Bus ISA STEbus Zorro II Zorro III CAMAC FASTBUS LPC HP Precision Bus EISA VME VXI VXS NuBus TURBOchannel MCA SBus VLB PCI PXI HP GSC bus InfiniBand UPA PCI Extended ( PCI - X ) AGP PCI Express ( PCIe ) Direct Media Interface ( DMI ) RapidIO Intel QuickPath Interconnect NVLink HyperTransport Infinity Fabric Intel UltraPath Interconnect Storage ST - 506 ESDI IPI SMD Parallel ATA ( PATA ) SSA DSSI HIPPI Serial ATA ( SATA ) SCSI Parallel SAS Fibre Channel SATAe PCI Express ( via AHCI or NVMe logical device interface ) Peripheral Apple Desktop Bus DCB HP - IL HIL MIDI RS - 232 RS - 422 RS - 423 RS - 485 DMX512 - A IEEE - 488 ( GPIB ) IEEE - 1284 ( parallel port ) UNI / O ACCESS. bus 1 - Wire D2B I2C SPI Parallel SCSI Profibus IEEE 1394 ( FireWire ) USB Camera Link External PCIe Thunderbolt Audio ADAT Lightpipe AES3 Intel HD Audio I2S MADI McASP S / PDIF TOSLINK Portable PC Card ExpressCard Embedded Multidrop bus CoreConnect AMBA Wishbone SLIMbus Interfaces are listed by their speed in the ( roughly ) ascending order, so the interface at the end of each section should be the fastest. Basic computer components Input devices Keyboard Image scanner Microphone Pointing device Graphics tablet Joystick Light pen Mouse Optical Pointing stick Touchpad Touchscreen Trackball Webcam Softcam Refreshable braille display Output devices Monitor Refreshable braille display Printer Speakers Plotter Removable data storage Optical disc CD DVD Blu - ray Disk pack Floppy disk Memory card USB flash drive Computer case Central processing unit ( CPU ) HDD / SSD / SSHD Motherboard Network interface controller Power supply Random - access memory ( RAM ) Sound card Video card Fax modem Expansion card Ports Ethernet FireWire ( IEEE 1394 ) Parallel port Serial port PS / 2 port USB Thunderbolt HDMI / DVI / VGA eSATA Audio jack Retrieved from `` https://en.wikipedia.org/w/index.php?title=USB_3.0&oldid=850148478 '' Categories : USB Computer - related introductions in 2008 Hidden categories : All articles with dead external links Articles with dead external links from March 2011 Articles with dead external links from July 2010 CS1 German - language sources ( de ) Use dmy dates from August 2016 Wikipedia articles in need of updating from December 2011 All Wikipedia articles in need of updating Talk Contents About Wikipedia বাংলা Български Català Deutsch Eesti Ελληνικά Español 한국어 Lietuvių Српски / srpski Suomi Tiếng Việt 中文 4 more Edit links This page was last edited on 13 July 2018, at 23 : 23 ( UTC ). 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Question: what does a usb port with ss mean
Answer: SuperSpeed USB (SS) that can transfer data at up to 5 Gbit/s (625 MB/s)