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I have upgraded an second hand Imac that had a 1TB hard drive with an I7 upgrade and Replace the 1TB mechanical HD with a 1TB SSD and also installed a 1TB NVMe drive with and apple adaptor. I have been able to install a fresh copy Catalina on it and have been trying to install windows 10 on it also. I keep having errors with bootcamp. When I try to create the windows 10 install disk it give me an error formatting drive. I have searched for help on the internet but what am I doing wrong? Any help would be great. Thanks Mike
I’d suggest you use an installer USB drive created on a PC - boot from that and do a clean install of Windows on the internal SSD (wiping it in the process). If you also want MacOS put that on a second (external?) drive. Windows will usually install itself pretty well on a bare Mac but sometimes you have to find drivers for the various bits of hardware. Bootcamp isn’t a great source of drivers most are old and may not work with Windows 10. Update (12/12/2022) With a separate drive to install Windows there is no need to use BootCamp. Here I have a 2012 MacBook with the Windows USB installer inserted. Holding down the Option key when booting the Mac will allow you to boot from the USB drive and install Windows on any internal SSD or HDD. If you have made the BootCamp disk it may be useful as a source of Windows drivers but you can usually find better ones elsewhere.
BootCamp can only run from the boot drive. This is an Apple limitation. Even still you appear to be having a more basic issue, from your description it sounds like you are using a M.2 SSD with an adapter. These can be tricky! More so when used in an iMac as it’s a bear to go back in maybe two or three times trying to get it to work. Frankly, they are more of a pain than worth it. I would stick with either a real Apple SSD or use the OWC SSD which is a true pin compatible drive. Yes, both are more expensive you can thank Apple for not sticking to an industry standard. Apple 1TB SSDOWC Aura Pro X2 SSD I would also run Apples Disk Utility from your HDD until you can see the drive within it. If you can’t the connection and/or the adapter and SSD are bad.
