Thank you for contacting our support community. We understand your situation regarding the Intel® Optane™ Memory.
We would like to inform you that the Intel® Rapid Storage Technology (Intel® RST) menu is only available when the SATA mode is an Intel® Optane™ memory Enabled selection, not AHCI.
Please follow the next steps in order to be able to boot the system once you change the BIOS mode:
1- Backup all files on your system.
2- Convert partition table from MBR to GPT with MBR2GPT.exe in order to allow the system to boot after the BIOS change, Make sure that you have the Latest Windows(R) 10 updates installed:
A- Open Command Prompt with administrator privileges
B- Issue the following command: mbr2gpt.exe /convert /allowfullOS
3-Shut down and boot into your BIOS
4-We recommend you to contact the computer manufacturer in order to get assistance with the proper BIOS configuration(How to change the SATA mode for Opatne(TM)) and also how to access the Intel® Rapid Storage Technology (Intel® RST) menu because we were not able to find any information.
Please let us know the outcome of the situation.
We would like to know if you read our previous post. If you have any other questions, we'll be waiting for your response.
I contacted Dell, and they walked me through getting into the Diagnostic portion of the BIOS, which is accessed separately from the regular BIOS menu you access by pressing F2 on boot. Instead I had to hit F12 for boot options and go into the Diagnostics option, which then had the Intel RST options in it. From there the regular steps to deconcatenate the Optane worked fine.
Once I got through those steps I ran setup again and everything seems to be working properly now.
Thanks for the reply.
We are glad to hear that your situation has been resolved.
If you have further questions then feel free to contact us again.