The terms and USB E34 are most commonly found in motherboard manuals and PC building contexts, where they refer to specific internal headers for connecting front-panel USB ports. The numbers "12" and "34" typically denote the pairs of ports that the header supports (e.g., ports 1 & 2 vs. ports 3 & 4) rather than a difference in technical speed. Internal USB Headers: E12 vs. E34
| Feature | USB E12 | USB E34 | |---------|---------|---------| | | USB 3.2 Gen 1 (5 Gbps) | USB 3.2 Gen 2 (10 Gbps) | | Max Read Speed | Up to 120 MB/s | Up to 400 MB/s | | Max Write Speed | Up to 40 MB/s | Up to 200 MB/s | | Capacities | 16 GB – 128 GB | 64 GB – 512 GB | | Connector | Type‑A (fixed) | Type‑A + Type‑C (dual) | | Build | Plastic body, capless sliding design | Metal casing, detachable cap | | LED Indicator | No | Yes (activity light) | | Price per GB | Low | Medium | usb e12 vs usb e34