How to replace the HD of my old Airport Time Capsule

I will answer my own question...this is for anyone who is not really technical but wants to keep his old Airport Time Capsule's Wi-Fi functioning while easily replacing the old worn out or outdated hard drive. I simply bought a WD My Passport for Mac (4TB HD) and connected it to the USB port on the back of the Time Capsule. But first, let me tell you about the computers I have connected to my network. I have a mid-2011 iMac 21.5", a late 2012 iMac 21.5" and a mid-2012 MacBook Pro 13." All of these computers were expanded to the max on RAM memory back in 2014-5 and then again here recently I replaced all of their Hard Drives with Solid State HDs (SSHD). This last step, upgrading to SSHD, gave my computers another 5 years of life. Power on to log on screen in less than a minute. So when my 2012 era Time Capsule began having Hard Drive issues I started looking around for a replacement and did not find anything I liked. I had bought some small external HD's which I began using for back up and storage for my portable MacBook Pro. So I decided to just attach one 4 TByte external HD to my Time Capsule when I realized that it has a USB port and see what happens. I searched for it through Finder on my Time Capsule and I found it. So, using Time Machine I disabled the "Data" drive on the Airport Time Capsule and enabled the 4T "My Passport for Mac" that was now visible on the Time Capsule.

Now, let me tell you something about these WD "My Passport for Mac" cheap ($60-$80) external HDs. They connect to the USB port and are therefore extremely slow; not to be used for anything other than mass storage and back up data. When I say slow, I mean slow. When connected directly to the USB port of an old iMac it can take 10-12 hours to make your first backup of 500 GBytes to the external drive. After the first one it works in the background and only has to back up a couple hundred MBytes and goes quickly with out you noticing it. Let me warn you that you might have to use the Mac "Disk Utility" to format the HD even though it claims to be for Mac. Connect the HD to your Mac and just get the Mac Disk Utility to erase the HD and use the default formatting. Then you can plug it in to the Time Capsule start making the first backup. You do not need any of the WD utility files, you just want to use the HD as a backup. Just forget the WD App; they just want to sell you stuff you don't need nor want.

Six months ago I went through the process of connecting the the Passport for Mac to my Airport Time Capsule. It took a couple of days to get two iMacs backed up the first time by Wi-Fi onto the HD attached to the USB port. (Do them one after the other and not both at the same time.) However, since that time, I have had Zero problems with the Time Capsule overheating or the Hard Drive failing. The backup process works seamlessly in the background and I do not worry about it. I just opened Time Machine and saw that a backup was recently completed and that I have 2.85 TB of 3.8 TB available on the My Passport for Mac. So, it is working and I don't have to worry about it.

See the attached images.

Thank you.