Find an available 15-pin SATA power cable from the power supply unit. Plug the power cable into the Western Digital hard drive. Insert the drive into an available bay at the front of the computer.

If you have a 3.5-inch hard drive and a 3.5-inch drive bay, ... Plug the drive's power adapter into an electric outlet, ... The SATA power connector looks like the data connector but is much wider.

If your motherboard controller is in AHCI mode, your SATA power plugs support hotswap (99.99999% do in common desktops) and your Windows driver does, yeah, you could theoretically do it.

I have a lot of extra hard drives laying around. Some of the drives are SATA and some of them are old IDE drives. I am thinking about getting rack/removable tray to go into one of my 5.25" bays so ...