USBの完全な歴史：1.0からUSB4 v2.0まで
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27年間のUSB進化史：12Mbpsから120Gbps、Type-AからType-Cまで。
## Timeline
| Year | Standard | Speed | Connector |
|---|---|---|---|
| 1996 | USB 1.0 | 12 Mbps | Type-A/B |
| 2000 | USB 2.0 | 480 Mbps | Type-A/B/Mini/Micro |
| 2008 | USB 3.0 | 5 Gbps | Type-A (blue) |
| 2013 | USB 3.1 Gen 2 | 10 Gbps | Type-A/C |
| 2014 | USB-C connector | — | Type-C |
| 2017 | USB 3.2 Gen 2x2 | 20 Gbps | Type-C only |
| 2019 | USB4 v1.0 | 40 Gbps | Type-C only |
| 2022 | USB4 v2.0 | 80/120 Gbps | Type-C only |
## Key Turning Points
1. **USB 2.0 (2000)**: Made USB the default for everything
2. **USB 3.0 (2008)**: 10x speed jump enabled external SSDs
3. **USB-C (2014)**: Reversible, universal connector
4. **USB4 (2019)**: Merged Thunderbolt 3 into USB standard
## The Naming Disaster
USB-IF has renamed standards multiple times. USB 3.0 became USB 3.1 Gen 1, then USB 3.2 Gen 1. This confusion has led consumers to distrust USB branding and rely on speed numbers (5/10/20/40 Gbps) instead.