What’s the difference between USB2.0 and USB3.0?

After reading the following three points, you will understand the difference between USB 3.0 and 2.0.
What's the difference between USB2.0 and USB3.0

Table of Contents

Why is USB3.0 better than USB2? Why do we recommend buying USB3? After reading the following three points, you will understand the difference between USB 3.0 and 2.0.

▮ data transmission

USB3.0 introduces complete duplex data transmission. Of the five lines, two are for sending data, the other two are for receiving data, and one is connected to the ground. In other words, USB 3.0 can read and write synchronously at full speed. Previous USB versions did not support full-duplex data transfer.

▮ Data transmission rate

The USB flash drive is connected to the system through a USB interface, and the speed of the interface limits the data transfer rate of the portable hard drive. Currently, the maximum transfer bandwidth of USB 2.0 is 480Mbps (60MB/s), while the maximum transfer bandwidth of USB 3.0 is up to 5.0Gbps (500MB/s). The USB 3.0 standard requires that the current capacity of the USB3.0 interface is 1A, while that of the USB 2.0 interface is 0.5A. However, the transmission speed in the application slows down for objective reasons (e.g. whether the production quality of the main control chip and the circuit board used in the storage device is good or not).

▮ Connector

Look at the USB port (itself) and the USB port on the computer. The color of the plastic sheet in the middle is USB3.0 – blue. USB – black. Of course, some devices’ color distinction is not standard, for example, some main control chips support non-native USB3.0 can not be blue, some USB 2.0 devices such as MP3, the data cable can be black or white plastic film. Also, USB 3.0 lines are “thicker” because USB 3.0 has four internal wires more than two. 0 wires. However, this connector is USB 3.0 by default. Includes additional connected devices.

▮ Datasheet comparison of USB2.0 & USB3.0

Transfer SpeedLow-Speed (1.5Mbit/s)
Full-Speed (12Mbit/s)
High-Speed (480Mbit/s)
SupcrSpccd (5.0Gbit/s)
Low-Speed (1.5Mbit/s)
Full-Speed (l2Mbit/s)
High-Speed (480Mbi(/s)
Name of large
transmission speed
SuperSpeed USB (SS)Hi-Speed USB (HS)
Max transmission
Max Range3m (Under normal conditions)5m
Data InterfaceDual simplex
The four-wire differential signal is separated from the USB2.0 signal and real at the same time
Bidirectional data flow
Half duplex, two wire differential signal
Bus transaction protocolHost-oriented, bound step transfer stream, USB packet transfer has a determined routeHost directed, polling transfer stream, USB packet broadcast to
All the equipment
Bus TypeUSB 3.0 uses a dual simplex four-wire differential signal line for point to point
Full duplex communication
USB 2.0 is based on a half-duplex and two-wire bus for broadcast mode communication
CableUSB 3.0 Shielded Differential Pair (SDP) The sheltered
Differential signal PAIR) line
USB 2.0 uses a slim, unshielded pair
Shielded Twisted Pair (Unshielded Twisted Pair)
Number of Cable signalsA total of 6
Four are used for ultra-high speed data transmission (SSTX+, SSTX-, SSRX+, SSRX-).
The other two are for general transmission (D+, D-)
2 (D+, D-)
Port StatePort hardware detection connection parts. And set the port to the operation state for super high
Fast data communication
Port hardware detects connection events. Use of system software
Port command to switch the port zhao status
Data transmission typeUSB type with ultra-high speed constraintsOnly four basic transport types are supported
Power ManagementMultilevel power management: standby, sleep, pause, and enableOnly device-level power management is supported
Bus power supply capabilityLow power equipment: 5V, maximum 150mA
High power consumption device: 5V, maximum 900mA
Low power equipment: 5V, maximum 100mA
High power consumption device: 5V. Maximum 500mA

▮ Words in the end

In short, USB 3.0 has the advantages of fast transmission speed, simple operation, hot swap support, flexible connection, and independent power supply. But for device compatibility, USB 2.0 is currently better.


DiskMFR Field Sales Manager - Leo

It’s Leo Zhi. He was born on August 1987. Major in Electronic Engineering & Business English, He is an Enthusiastic professional, a responsible person, and computer hardware & software literate. Proficient in NAND flash products for more than 10 years, critical thinking skills, outstanding leadership, excellent Teamwork, and interpersonal skills.  Understanding customer technical queries and issues, providing initial analysis and solutions. If you have any queries, Please feel free to let me know, Thanks

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