no ability to communicate with this drive

Power Mac - Late 2003 - Western Digital Black 1T Hard Drive ( 2019 ) - SATA Hard Drive . Power Mac ( Late 2003 ) had no ability to communicate with this drive as it shipped. Enable/Activate OPT1 ( 1.5 Gb/s Data Transfer Speed ) with a Jumper On/Between Pins 5 & 6. Instructions can be found here . . . https://support-en.wd.com/app/answers/de...

With Hard Drive ( label up communication / power connectors down )

it is the ( 3rd set of pins from Right = 2nd set of pins from Left ) I used a

jumper from an old drive no longer in use. This will force the drive to use

the appropriate 1.5 Gb/s Data Transfer Speed/Mode.