the steps in which you are asked to disconnect cables are totally useless and, as shown by some requests for help, even dangerous

Also this step can be omitted: you can remove the disk even without disconnecting the red and white cable out of its connector; you just have to unscrew the controller either from one side or from the other

Also this step can be omitted: you can remove the disk even without disconnecting the ribbon cable out of its connector; you just have to unscrew the controller either from one side or from the other

this step can be omitted: you can remove the disk even without disconnecting the black and blue ribbon cable out of its connector.