An electrical adapter assembly for connecting a first hard disk drive and a second hard disk drive. The electrical adapter assembly includes a first connector and a second connector. The first connector includes a first golden fingers capable of electrically inserting into the first hard disk drive and a second golden fingers electrically connecting to the first golden fingers. The second connector includes a first plug electrically connecting the second connector to the second golden fingers, a second plug capable of electrically inserting into the second hard disk drive, a chip configured for controlling data transfer between the first hard disk drive and the second hard disk drive, and circuits connecting the chip to the first connector and the second connector.