How to remove duplicated OS on separate HDD, and how to store OS and boot manager on a single drive

[Windows 10]

Okay this is going to be a long story: Previous setup: 1 SSD as OS, 1 HDD (HDD-A) which somehow later found out has a Windows Boot Manager, and 1 HDD (HDD-B). System: Win10 Home, version 22H2I was getting a new desktop so I removed HDD-A, and unleashed a whole disaster. The computer won't boot and went straight to 'Install Windows'. Not knowing why it does this, and having no room on SSD, I opted to install a new Windows on HDD-B. And regretted very soon, because now it only boot from HDD-B with the new OS. While I can still access the SSD and saw the original OS with all the documents and sav

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