Hi Marty. How to fix a split Fusion Drive This is a support document from Apple USA. There is a problem with your Mac, so it's worth a try. The backup will be in the external SSD. Another way is to kill a small built-in SSD. Boot from the recovery area and format it with Disk Utility. Leave as it is. Or start up in target disk mode and connect to Windows 10 machine. Hit the Disk Part with the power shell with administrator privileges. List Disk Find the small SSD number of your Mac. Select Disk * * is the target number. Check well and type crean. Although SSD exists physically, it does not exist ethically. The disturbing person disappeared. Good Luck
Ya, it's Can do it. 1st need all parts remove. 2nd genteelly undo cpu hold screws and GPU hold one. Heatsink surfaces are really rough finish, you’ll LOL. cuz Shanghai assembler put on tooooo much thermal grease. CPU had remove socket by donkey grease. Really careful remove it. never vend socket pin. If vend 10 or more, logic board will gone. Remove old dried grease , then paste high-end one. Set 7700K, first boot during max rev fan. never mind. remake Apple Nvme + SSD’s fusion drive and reinstall you like Mac OS X. OS X make and compile for i7. Well, it’s easy to PC/AT self made one. Not easy to what is this something flat one? Please think twice. it’s all-right. may-be. but it’s not so hard but take a long time. yes, long time. Thanks.