Hard disk back plate connecting method and system supporting double control modes and connecting cable

An embodiment of the invention discloses a hard disk back plate connecting method and system supporting double control modes and a connecting cable. The method includes the steps: distributing a clk (clock) buffer for each PCIE (peripheral component interface express) interface on a host side, and dividing a clock signal into two by each clk buffer; transmitting the clock signals to 2N PCIE interfaces at one end, connected with a PCIE switch, of the cable; dividing a data channel of each PCIE interface at one end of the cable into two groups, connecting one group with a host 1, connecting theother group with a host 2, and connecting the other end of the cable to the corresponding PCIE interface on a hard disk back plate; transmitting two clock signals on each PCIE interface on the host side to the corresponding PCIE interface interfaces on the hard disk back plate through the cable. Double control is realized by the universal hard disk back plate, and the workload of designers and design cost are reduced. 本发明