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 faster than the USB 2.0 standard. It is recommended that manufacturers distinguish USB 3.0 connectors from their USB 2.0 counterparts by using blue color for the Standard-A receptacles and plugs, and by the initials SS.
SuperSpeed+ USB logo
|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|Superseded||USB 2.0 Hi-Speed|
|Superseded by||USB 3.1 (July 2013)|
|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)|
|Max. current||900 mA|
|Bitrate||5 Gbit/s (500 MB/s)|
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 USB3-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).
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 (0.48 Gbit/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 featuresEdit
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 synchronizationEdit
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.
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 3 meters (9.8 ft).
Power and chargingEdit
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.:section 188.8.131.52 Power Budgeting
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.
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, 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.[needs update] 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 equipmentEdit
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 cannot 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.
The USB Promoter Group announced the release of USB 3.0 on November 2008. On 5 January 2010, the USB-IF announced the first two certified USB 3.0 motherboards, one by ASUS and one by Giga-Byte Technology. 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.
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.
Speed and compatibilityEdit
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 interferenceEdit
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. When manufacturers were unable to resolve the interference issues in time, some mobile devices, such as the Vivo Xplay 3S, had to drop support for USB 3.0 just before they shipped. 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.
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.:sections 184.108.40.206 and 220.127.116.11
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, allowing devices with USB 3.0 Micro-B ports to run at USB 2.0 speeds on USB 2.0 Micro-B cables. 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.
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.
|A connector||B connector|
|2||White||D−||USB 2.0 differential pair|
|4||Black||GND||Ground for power return|
|5||Blue||StdA_SSRX−||StdB_SSTX−||SuperSpeed receiver differential pair|
|7||N/A||GND_DRAIN||Ground for signal return|
|8||Purple||StdA_SSTX−||StdB_SSRX−||SuperSpeed transmitter differential pair|
|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)|
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 cannot 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.
In January 2013 the USB group announced plans to update USB 3.0 to 10 Gbit/s (1250 MB/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 also reduces line encoding overhead to just 3% by changing the encoding scheme to 128b/132b, with effective data rate of 1,212 MB/s. 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 data signaling rate over 1 lane using 8b/10b encoding (effective 500 MB/s); the same as USB 3.0
- USB 3.1 Gen 2 – SuperSpeed+, new 10 Gbit/s data rate over 1 lane using 128b/132b encoding (effective 1212 MB/s)
The nominal data rate in bytes accounts for bit-encoding overhead. The physical SuperSpeed bit rate is 5 Gbit/s. Since transmission of every byte takes 10 bit times, the raw data overhead is 20%, so the byte rate is 500 MB/s, not 625. Similarly, at SS+ rate the encoding is 128/132, so transmission of 16 bytes physically takes 16.5 bytes, or 3% overhead. Therefore, the byte-rate at SS+ is 128/132 * 10 Gbit/s = 9.697 GBit/s = 1212 MB/s. In reality the SS bus has some additional service overhead (link management, protocol response, host latencies), so the best-case achievable data rates are about 10% smaller.
This rebranding of USB 3.0 as "USB 3.1 Gen 1" has allowed manufacturers to advertise products with transfer rates of only 5 Gbit/s as "USB 3.1," omitting the generation.
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, released 22 September 2017, 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 USB-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 1×1 – SuperSpeed, 5 gigabits per second (Gbit/s) data signaling rate over 1 lane using 8b/10b encoding (effective 500 MB/s) , the same as USB 3.1 Gen 1 and USB 3.0.
- USB 3.2 Gen 2×1 – SuperSpeed+, 10 gigabits per second (Gbit/s) data rate over 1 lane using 128b/132b encoding (effective 1,212 MB/s), the same as USB 3.1 Gen 2.
- USB 3.2 Gen 1×2 – SuperSpeed+, new 10 gigabits per second (Gbit/s) data rate over 2 lanes using 8b/10b encoding (effective 1 GB/s).
- USB 3.2 Gen 2×2 – SuperSpeed+, new 20 gigabits per second (Gbit/s) data rate over 2 lanes using 128b/132b encoding (effective 2,424 MB/s).
As with the previous version, the same considerations around encoding and effective data rates apply. Although both Gen 1×2 and 2×1 signal at 10 Gbit/s, Gen 1×2 uses the older, less efficient line coding which results in smaller byte-rate.
In February 2019, USB-IF simplified the marketing guidelines and required the SuperSpeed trident logos to include maximum transfer speed.
|USB-IF recommended marketing name||Logo||USB 3.2
|Older specifications ||Dual-lane||Encoding||Nominal speed||Connectors|
|Gbit/s||GB/s||USB-A, B, micro B
|SuperSpeed USB 5Gbps||USB 3.2 Gen 1×1||USB 3.1 Gen 1||USB 3.0||No||8b/10b||5||0.5||Yes||Yes|
|SuperSpeed USB 10Gbps||USB 3.2 Gen 2×1||USB 3.1 Gen 2||Does not appear||No||128b/132b||10||1.2||Yes||Yes|
|N/A||USB 3.2 Gen 1×2||Does not appear||Yes||8b/10b||10||1.0||No||Yes|
|SuperSpeed USB 20Gbps||USB 3.2 Gen 2×2||Does not appear||Yes||128b/132b||20||2.4||No||Yes|
- "Intel Universal Serial Bus (USB) Frequently Asked Questions (FAQ)". Intel.com. Intel Corporation. Retrieved 26 December 2014.
- "Universal Serial Bus Revision 3.1 Specification". USB.org. USB Implementers Forum. pp. 5–20. Archived from the original (ZIP) on 12 April 2016. Retrieved 12 April 2016.
- 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 18 February 2016 – via Internet Archive.
Most PC manufacturers label each USB port using the logo for USB type ... the USB 2.0 logo is a trident, while the USB 3.0 logo is a similar trident with the letters 'SS' (which stands for SuperSpeed) attached.
- "USB 3.1 Specification Language Usage Guidelines from USB-IF" (PDF). USB.org. USB Implementers Forum. 28 May 2015. Archived from the original (PDF) on 12 March 2016. Retrieved 10 March 2016.
- "USB 3.1 Gen 1 & Gen 2 explained". MSI.com. Micro-Star International. 5 August 2015.
- "USB 3.2 Specification". USB.org. USB Implementers Forum. Retrieved 30 August 2018.
- "Universal Serial Bus Revision 3.1 Specification". USB.org. USB Implementers Forum. Archived from the original (ZIP) on 21 November 2014. Retrieved 19 November 2014.
- Engbretson, Mike (January 2009). "USB 3.0 Physical Layer Measurements". Evaluation Engineering. Retrieved 31 January 2013.
- "USB 3.0 Technology" (PDF). hp.com. 2012. Archived from the original (PDF) on 3 January 2014. Retrieved 2 January 2014.
- "Universal Serial Bus Revision 3.0 Specification". Archived from the original on 19 May 2014. Retrieved 19 May 2014.
- Axelson, Jan. "USB 3.0 Developers FAQ". JanAxelson.com. Retrieved 14 November 2018.
- "USB Power Delivery Specification 1.0" (PDF). Archived from the original (PDF) on 4 April 2016. Retrieved 14 November 2015.
- "USB‐IF" (PDF). USB.org. USB Implementers Forum. 17 November 2008. Archived from the original (PDF) on 31 March 2010. Retrieved 22 June 2010.
- "First Certified USB 3.0 Products Announced". PC World. 7 January 2010. Retrieved 22 June 2010.
- "SuperSpeed USB Consumer Cert Final 2" (PDF). USB.org. USB Implementers Forum. Archived from the original (PDF) on 2 April 2012. Retrieved 24 June 2011.
- "USB-IF announces second certified USB 3.0 host controller" (Press release). USB Implementers Forum, Inc. 16 November 2010. Retrieved 30 August 2018.
- "USB 3". Lecroy. Retrieved 22 June 2010.
- "First Certified Superspeed USB Consumer Products Announced" (PDF) (Press release). USB Implementers Forum. 5 January 2010. Archived from the original (PDF) on 14 January 2010.
- "USB 3.0 Motherboards". Gigabyte.com. Indianapolis: Gigabyte Technology. Archived from the original on 1 June 2010. Retrieved 14 October 2019..
- "Asus cancels its first usb 3.0 motherboard". The Inquirer. Retrieved 22 June 2010.
- "Digitimes". 15 March 2009. Retrieved 22 June 2010.
- "Freecom.com". Archived from the original on 17 June 2010. Retrieved 22 June 2010.
- Ngo, Dong (5 January 2010). "Seagate ships USB 3.0-based external hard-drive kit for laptops | CES". CNET. Retrieved 22 June 2010.
- "BlackArmor PS 110 with USB 3.0 | Portable Hard Drive for Business with Backup Software". Seagate. Archived from the original on 15 August 2010. Retrieved 18 January 2014.
- "Kernel newbies". 9 September 2009. Retrieved 22 June 2010.
- "Erste USB 3.0 Treiber" [First USB 3 drivers coming with Linux 2.6.31]. Heise Online (in German). Germany: Heise Medien. 3 December 2009. Retrieved 22 June 2010.
- "First driver for USB 3.0". Linux magazine. 9 June 2009. Retrieved 22 June 2010.
- "FreeBSD 8.2-RELEASE Release Notes". FreeBSD.org. 13 November 2013. Retrieved 5 August 2015.
- McVay, Bob (15 September 2011). "Understanding USB 3.0 in Windows 8 | Build2011 | Channel 9". Channel9.MSDN.com. Retrieved 19 January 2014.
- "USB in MS Windows 7 more reliable, but no 3.0 speed boost". APCMag.com. Retrieved 22 June 2010.
- Crothers, Brooke (7 March 2010). "Long delay expected for Intel support of USB 3.0 | Nanotech – The Circuits Blog". CNet News. Retrieved 19 January 2014.
- "Spekulationen über Verzögerungen bei USB 3.0". Heise Online (in German). Germany: Heise Medien.
- Mah, Paul (23 October 2009). "Fiercecio.com". Retrieved 22 June 2010.
- "FAQ — PCI Express 3.0". PCISIG.com. Peripheral Component Interconnect Special Interest Group. 1 July 2009. Retrieved 22 June 2010.
- "PCIe 3.0 Specification Coming Soon". Enterprise Storage Forum. 5 May 2010. Archived from the original on 10 July 2011. Retrieved 22 June 2010.
- "Intel delays USB 3.0 support until 2011". TechSpot. 22 October 2009. Retrieved 22 June 2010.
- TeamVR (23 August 2011). "USB 3.0 Speed Tests: 7-way Host Controllers Roundup – Page 5 of 11". VR-Zone.com. Retrieved 19 January 2014.
- "USB 3.0: Renesas Electronics USB 3.0 Firmware Updates". DownloadCenter.Intel.com. Intel Corporation. Retrieved 19 January 2014.
These firmware updates resolve the following issues related to the USB 3.0 ports on these boards: • BIOS and operating system do not detect devices attached to the USB 3.0 ports. • System hangs on POST code 58 for one minute if any device is attached to USB 3.0 ports, and then continues the boot process. • In Device Manager, the Renesas USB 3.0 eXtensible Host Controller is shown with a yellow bang and the error message 'Windows has stopped this device because it has reported problems. Code 43'.
- "NEC uPD720200 USB 3.0 not working on Ubuntu 12.04". Ask Ubuntu. Stack Exchange Network. Retrieved 19 January 2014.
- "How to improve the compatibility of USB3.0 devices?". Gigabyte.com. Gigabyte Technology. Retrieved 19 January 2014.
- Nilsson, Lars-Göran (30 July 2010). "Gigabyte adds UASP support to its USB 3.0 motherboards". SemiAccurate. Retrieved 19 January 2014.
- Nilsson, Lars-Göran (11 August 2010). "Gigabyte's UASP USB 3.0 driver boosts USB 2.0 performance". SemiAccurate. Retrieved 19 January 2014.
- Ku, Andrew (19 June 2012). "USB Attached SCSI (UAS): Enabling Even Better USB 3.0 Performance – Faster USB 3.0 Performance: Examining UASP And Turbo Mode". Tom's Hardware. Retrieved 19 January 2014.
- Hamid, Adnan (18 March 2012). "What's the Difference Between USB UASP And BOT | Embedded content from". Electronic Design. Retrieved 22 January 2014.
- Soderstrom, Thomas (9 December 2009). "New Motherboards from Asus and Gigabyte – USB 3.0 Performance: Two Solutions from Asus and Gigabyte". Tom's Hardware. Retrieved 22 January 2014.
- Schmid, Patrick; Roos, Achim (26 August 2010). "Gigabyte P55A-UD6 and UD7 (NEC PD720200) – Not All USB 3.0 Implementations Are Created Equal". Tom's Hardware. Retrieved 22 January 2014.
- 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
- "USB 3.0 Radio Frequency Interference Impact on 2.4 GHz Wireless Devices" (PDF). USB.org. USB Implementers Forum. April 2012. Retrieved 14 October 2019.
- "手机厂商阉割Type-C接口的真相：影响手机信号！-科技频道-手机搜狐" [The Truth About Mobile-Phone Manufacturers Cutting the Type-C Interface: Affecting Cell Phone Signals!]. Sohu.com (in Japanese). 2017.
- Lynn, Samara (5 September 2013). "Wireless Witch: The Truth About USB 3.0 and Wi-Fi Interference". PC Magazine. Retrieved 14 July 2014.
- "USB 3.0 Interface Bus, Cable Diagram". 100806 interfacebus.com
- "USB Background". TotalPhase.com. Total Phase Corporation. Retrieved 11 September 2016.
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
- "SuperSpeed USB (USB 3.0) Performance to Double with New Capabilities" (PDF). Implementers Forum (Press release). 6 January 2013. Archived from the original (PDF) on 13 January 2013.
- "SuperSpeed USB 10 Gbps – Ready for Development" (PDF) (Press release). Hillsboro, Oregon. 31 July 2013. Archived from the original (PDF) on 27 January 2016.
- "Archived copy" (PDF). Archived from the original (PDF) on 12 March 2016. Retrieved 10 March 2016.CS1 maint: archived copy as title (link)
- "USB Logo Usage Guideline" (PDF). USB.org. USB Implementers Forum. 30 November 2018. Retrieved 27 February 2019.
- "SuperSpeed USB 10 Gbps – Ready for Development". Rock Hill Herald. Archived from the original on 11 October 2014. Retrieved 31 July 2013.
- "Synopsys Demonstrates Industry's First SuperSpeed USB 10 Gbps Platform-to-Platform Host-Device IP Data Transfer". News.Synopsis.com (Press release). Mountain View, California: Synopsys. 10 December 2013. Retrieved 23 December 2013.
- Bright, Peter. "USB 3.2 is going to make the current USB branding even worse". Ars Technica. Retrieved 27 February 2019.
- "The USB 3.2 Specification released on September 22, 2017 and ECNs". USB.org. USB Implementers Forum. September 2017. Retrieved 14 October 2019.
- Saunders, Brad; Nardozza, Liz (25 July 2017). "USB 3.0 Promoter Group Announces USB 3.2 Update" (PDF) (Press release). USB 3.0 Promoter Group. Archived from the original (PDF) on 21 September 2017. Retrieved 27 July 2017 – via USB.org.
- 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.
- "Synopsys Shows World's First USB 3.2 Demo With 20Gbps Speeds". Tom's Hardware. 25 May 2018. Retrieved 27 May 2018.
- "World's First USB 3.2 Demonstration". Synopsys. 18 May 2018. Retrieved 27 May 2018 – via YouTube.
- "USB 3.2 Work Is On the Way for the Linux 4.18 Kernel". Phoronix.com. Phoronix. Retrieved 27 May 2018.
- USB 3.2 Specification Language Usage Guidelines from USB-IF
- "USB 3.1 Legacy Connectors and Cable Assemblies Compliance Document Rev 1.1". USB.org. USB Implementers Forum. Retrieved 27 February 2019.
|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