Some progress updates:
I got fed up of waiting for the final step, so I shutdown the PC and disconnected the secondary drive, when I'm back at windows, the Optane software shows its disabled.
Reconnecting the secondary drive did not yield anything on this PC (for some odd reason Optane software can see the drive but says it is incompatible), so I transferred the drive to another PC that's not running Optane or RAID (it's a simple AHCI setup).
Luckily my files on the secondary drive is still intact, I can view documents and run my programs off of it on the new PC.
The drive remains invisible to the original PC when i connect it back. I uninstall the Optane software, I did receive a warning that data might be lost but push on ahead anyway.
Even after uninstalling the Optane software, my system remains in RAID/Optane mode. I believe this is probably the reason it is not seeing the secondary drive.
I changed the SATA mode in BIOS to AHCI but windows refused to boot, automatic repairs doesn't work either (The NVME drive was originally installed on AHCI mode prior to the introduction of Optane into the system).
So I want to know if there's anything I can do to revert back to AHCI mode without me going through a complete re-installation of windows (in AHCI mode), I also hope by reverting back to AHCI mode I can reconnect the secondary drive and get it recognized (since it works on another PC).
This whole ordeal has really sour my experience with Intel Optane, yea it is a great product and works perfectly but the removal process is a giant pain, Im not looking forward to upgrading because of the risks of losing precious data.
Hope you can help