主机电源上1分2的电源线，D型4针接口，通常是IDE硬盘、光驱的电源接口。

电源大4P扁口接头的补给线/扩展线

针对电源P4口不足的补给
Host power on the 1 minute 2 power cord, D-type 4-pin interface, usually IDE hard drive, optical drive power connector.

Power supply 4P flat connector supply line / extension line

Ports for the lack of supply port P4