HI, I am upgrading my 11,3 mid 2010 iMac with a new internal 500Gb SSD and a new 2Tb HDD as the internal HDD has failed. It was actually a new internal Toshiba replaced by Apple under warranty but still failed after only two years. So have bought a WD HDD and a Crucial MX500 SSD. Anyway....can I do my OSX install using an external dock and then put the SSD and HDD inside the mac? Sounds like thats what you did. I want to start with a clean install rather than cloning back my backup which is full of **bleep**. Also I was intending on using High Sierra and APFS. Any residual issues with APFS. Alot of forums suggest satying with HFS J. I currently use Mavericks but a couple of programs like Logic Pro need the later OSX if I want to use the latest iteration. Similalrly I am thinking of updating Parallels (currently using 10) so I can use Windows 10, and thus I need a newer version of OSX.
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