The Fusion Drive was announced as part of an Apple event held on October 23, 2012, with the first supporting products being two desktops: the iMac and Mac Mini with OS X Mountain Lion released in late 2012. Internal slow SATA drive replaced with 2TB SSD Apple Fusion Drive System (Wiki) (If you do, you do not have to worry about Fusion Drive system link is broken or not as the internal replaced SSD is fast enough to cope with the resource hungry Big Sur operating system) If you really want to continue installing Big Sur on your Fusion Drive system Mac computer, the simplest solution is to replace the internal very slow SATA drive with a SSD first. I would not recommend installing Big Sur on a Fusion Drive system-based Apple computer at all – you are just asking for trouble. Considering the latest Windows 10 installation iso file (either Pro or Home) still fits on single layer DVD disk (4.3GB) you can see how big the macOS Big Sur installation file is.
(most likely it’s the cheapest drive in the market).īig Sur compressed installation file size is about 12GB resource hungry monster file. The *eagate SATA drive is so notorious for it’s failure rate (more than 1% – it means one in a hundred will die within a year for no reason) and I do not know why Apple keeps using this drive. I did not bother fixing the link (waste of time), instead, replaced the very notorious 1TB SATA drive (*eagate) with 2TB 2.5 inch SSD drive and setting up Big Sur 11.23 official release migrating whole data contents of 1TB SATA drive (took more than 12 hours). Starting up an iMac, you can only see the rainbow colour hour glass going around for too long that it’s almost impossible to do anything.įor whatever the reason, it appeared the internal Fusion link between a fast Apple Flash drive and a very slow 1TB SATA drive was broken. (Our client joined Apple Developer program and Big Sur was auto updated from 11.3 beta to 11.4 beta at that time) The SATA Hard Drive was about 90% full. Attended the iMac 27 inch 2014 Fusion Drive system about a little more than month and half ago (128GB Flash storage + 1TB SATA Hard Drive) where client iMac became too slow after updating Big Sur 11.3 beta to 11.4 beta.
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