Convert the D-type 4-pin power plug to a SATA power plug, so that the computer power supply without a SATA power plug can power SATA devices. Commonly used SATA devices are: SATA hard disks, SATA optical drives, etc. Wire description: The large 4P port used for the power supply in the chassis becomes two SATA hard disk power supply ports, which can supply power for more SATA devices.