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Model A1419 / EMC 2806 / Late 2014 or Mid 2015. 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (iMac17,1) All with Retina 5K displays

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How to use BootCamp on replaced SATA&NVME ssd properly?

*Please understand that English is not my native language. :)

I am currently using the iMac in its original configuration. (2015 late 27" 5k, 2TB fusion drive, MacOS Monterey)

I want to replace the 2TB hard drive with a sata ssd(870 evo), and the old blade ssd with a new nvme ssd(SN750).

The original goal was to install MacOS on SATA and Windows (BootCamp) on NVME SSD.

However, I found out that my Mac does not support this configuration (two separate internal drives).

My questions:

1. In order to install Windows using Boot Camp, is it true that two SSDs must be combined into a fusion drive? Is SSD RAID impossible?

2. Will performance decrease if combined with fusion drive?

Thank you!

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You don’t have many options here. Fusion Drives where a stopgap solution Apple did as the cost of the faster I/O of the blade SSD (even mSATA at the beginning) was quite high. Today that is less so and PCIe/NVMe 2 then 4 lanes has pushed the performance well beyond what a SATA III (6.0 Gb/s) drive can offer.

But Apples custom interface creates some issues! First off I really don’t recommend trying to force fit M.2 SSDs into iMacs. While a light user might find them workable, a serious amateur or Pro will quickly encounter issues. Then when trying to combine OS’s like you want to do it adds additional complexities.

So I would either stick with a Fusion Drive setup with a SSD/HDD configuration or run with a Apple, OWC or Transcend blade SSD running Boot Camp so you can then get MS Windows running within it. You might be able to setup a try dual boot macOS / Windows setup but most find that is painful having to restart to jump between hence why most stick with BootCamp. As far as the SATA drive what ever you put in is just a data drive. It won’t hold the OS’s (nor does it need to)

1 - You can’t run a RAID internally as the I/O speeds are to different. One can create and use an external RAID system. As an example I use two M2 RAID boxes connected to my Mac Pro. I don’t use Windows on my Mac Pro and even MS recommends you don’t run Windows on a RAID drive set.

2 - Two SSD’s running in a Fusion Drive set won’t increase performance (mostly it lowers it) the SSD with an original Fusion Drive setup is used as a Caching drive to speed up often accessed data blocks (not files) then if the block was altered write it back this is done at the OS level (macOS) which is why you can’t run Windows natively.

To expand this a bit. The premise to create performance is to use a dual drive setup where the blade SSD is the OS and App holder and a far amount of free space is left for the OS to have elbow room for Virtual RAM and Caching. And if your applications can leverage it use the space for scratch space. So your media and data is strictly on the SATA drive! I like using 512GB for low end amateurs, and 1 or 2TB blade drives for advanced and pro users that do image, video or music work.

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Thank you for your reply.

I changed my configuration a little bit based on your reply. Is this possible?

First: Install MacOS on 2TB blade SSD(not Fusion Drive, leave SATA 2TB SSD alone).

Second: Install windows with BootCamp on also blade SSD (I am concerned that there have been reports of errors occurring at this stage, reason why I thought I should use Fusion Drive at first. Link: https://discussions.apple.com/thread/250... )

Lastly: Use SATA 2TB SSD as a standalone media and data storage (Maybe have to Format as exFAT to use both windows and MacOS?)

Once again, thank you for your thoughtful response! It's like a ray of hope for me.

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@tommy18286 - the issue these others had was the Windows OS was incorrectly installed onto a removable drive so when the drive was removed MacOS BootCamp services couldn’t find the OS!

The OSs must be on a non-removable drive so when it’s running there is no loss of access to the OS files - This is not an issue here.

The PCIe/NVMe drive is where both OS’s sit and the internal SATA drive is your data drive. Before you commit to a given file system on the SATA drive I recommend you play around with a few of them so you know what issues you are likely to encounter.

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