สาย USB ผิดประเภททำให้อุปกรณ์เสียหายได้หรือไม่?

## The Short Answer: Yes, It's Possible

While modern devices have protection circuits, bad cables can still cause problems.

## The Benson Leung Incident

In 2016, Google engineer Benson Leung famously destroyed a Chromebook Pixel by testing a poorly made USB-C cable. The cable had incorrect resistor values that allowed excessive current to flow.

## Real Risks

- **Cheap USB-C cables without e-markers**: May negotiate wrong power levels
- **USB-A to USB-A cables**: Never use these — connecting two hosts can fry both
- **Wrong voltage chargers**: A 20V charger on a 5V device (if no protection)
- **Counterfeit Thunderbolt cables**: May lack proper shielding, causing data corruption

## Modern Protections

- **USB PD negotiation**: Devices agree on voltage/current before power flows
- **E-marker chips**: USB-C cables over 3A must have identification chips
- **Over-current protection**: Most modern devices shut off if current exceeds limits

## Stay Safe

Buy from reputable brands. Look for USB-IF certification. Avoid suspiciously cheap cables on marketplace sites.