How do I make an HDD as fast as an SSD? I have a really slow iMac that I bought 2 years ago. I've been so annoyed about how I have to wait for the rainbow circle to stop loading. I did some research and found out it's about the hard drive. My iMac had an HDD drive. I didn't want to buy an SSD so I thought why not do something to make the HDD as fast as an SSD.
Can you please help me on making an HDD as fast as an SSD?

Here are my imac specs
I'm afraid that's impossible. Your hard drive is essentially not much different from an old record turntable: it has spinning disks and a 'head' that writes or reads the magnetic stripe at a point on the wheel.
There are many different mechanical parts that all contribute limitations to the maximum possible speed.
Furthermore: it's a sealed unit, made in a factory. If there was some easy 'tweak' to make it as fast as an SSD, the manufacturers would have done it.