Firewire 800 Plug is Too Big for Socket in Back of my iMac
I have an external hard drive which I wish to use for my Time Machine backups and wish to connect it to my iMac using the FireWire 800 Socket.
I have purchased a lead which has a Firewire 9pin 800 plug on it, which is too big for the socket on my iMac. The plug on the other end fits okay into my Western Digital 2TB External Drive.
But can anybody tell me what sort of plug I need (or adaptor) to fit my iMac?
Thank you
iMac 21.5", macOS 10.13