iMac with SSD + normal HD = a Brand NEW iMac!

My Problem

My mechanical hard drive was working very, very, very slowly.

Everytime I was opening a new file, the waiting cursor appeared, when I wanted to read a file, it was very slow, etc..

The mac was not "usable".

My Fix

Perfectly, in 30min, it was finished !

My Advice

Take your time, go step by step, and be careful.