USB详解：类型、速度和你真正需要的
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理清USB困惑：Type-A vs Type-C，USB 2.0 vs 3.2 vs USB4，以及该买哪种线缆。
## The USB Naming Problem
USB naming is notoriously confusing. Here's the simplified version:
| Marketing Name | Technical Name | Speed |
|---|---|---|
| USB 2.0 | USB 2.0 | 480 Mbps |
| USB 3.0 / USB 3.1 Gen 1 / USB 3.2 Gen 1 | USB 3.2 Gen 1 | 5 Gbps |
| USB 3.1 Gen 2 / USB 3.2 Gen 2 | USB 3.2 Gen 2 | 10 Gbps |
| USB 3.2 Gen 2x2 | USB 3.2 Gen 2x2 | 20 Gbps |
| USB4 | USB4 Gen 3x2 | 40 Gbps |
| USB4 v2.0 | USB4 Gen 4 | 80 Gbps |
## Connector Types
- **USB-A**: The classic rectangular plug. Found on PCs, chargers, and flash drives
- **USB-C**: The small, reversible oval plug. The future standard for everything
- **USB-B**: Square-ish plug for printers
- **Micro-B**: Small plug for older Android phones (pre-2017)
- **Lightning**: Apple's proprietary connector (iPhone 14 and earlier)
## What Cable Should You Buy?
For most people in 2024:
- **Charging**: Any USB-C cable with PD support (check wattage rating)
- **Data transfer**: USB-C cable rated for USB 3.2 Gen 2 (10 Gbps)
- **Docking/displays**: Thunderbolt 4 or USB4 cable
- **Phone charging**: USB-C to USB-C with 60W+ PD