sata电源接口解析
Serial ATA Power connector
sata硬盘的电源接口有用的有2对，分别是5v电源和12V电源，但是我在部分设备中发现电源11号引脚Gnd貌似有特殊的用处。
网上查到资料如下：
Pins 1, 2, and 3 are optional.
Pins 3, 7, 13 and Ground are longer on the plug so they connect first.
Pin 11 can be used for activity indication, staggered spin-up, both, or nothing.
