Hallo there, i have imac 5K 2015 with fusion drive 2tb. I feel comfortable with disk speed, but i hate the noise of spining hard disk, i thing its overall noisy. My friend have the same configuration with SSD and its far less noisy) Iam not heavy user, just wathing few films, office, browsing and my medical programs( now i have 200 gb used from 2tb capacity and half of that are old unusefull files which iam lazy to delete) I would like to unfuse the drive, instal system just on internal 120 gb SSD drive a unmount/deactive the spining disk. Is it possible? I found some commands but no one tried it on 5k imac. I would like to buy external thunderbolt/ usb SSD disk to use it for data (for downloads, big files ETC) Is this fine solution, any hints? Thanks in advice, R.