Windows 10: win10 64..second drive

I just got 2 HP590s with win10-1803.
They provide a second sata port and in previous PCs I installed 2 SSD-cloned to second drive-set up EasyBCD and could dual boot with no problem.
Now they have UEFI and I can only boot from the second drive if I disconnect the other.
I also see in BCD that entry #1 is listed as Windows Boot Manager. The other 2 drives are listed OK with drive letters.

If I switch both drives to legacy boot, will my dual boot begin to function as in the past.
I never had a virus problem with legacy before but the secure boot says only it is safe.

I spent a lot of time with HP support on this but received scripted answers that made no sense.

Thanks for any help..

:)

 

Make second drive bootable

Thanks guys. The first drive is actually now in another computer. I was trying to cheat to make the drive that was the second drive bootable. I downloaded Partition Wizard Bootable CD and was able to make it the primary drive, but that still didn't work since it had installed BOOTMGR on the first drive. Secondly, I'm short one DVD drive ATM. I'll have a new DVD drive here on Friday and then I will try newtekie's suggestion, mostly out of curiosity. It has 32 bit on it now and I'm going to give 64 bit a try. Anyone have the RC1 64 bit ISO?

 

Post your source for the best Stepping for Amd 64's and Optys

Post your Stepping and o/c for Amd 64's Am2 /939 and Optys

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Dual Boot Win10 64 bit and Win10 32 bit

When I originally installed Win10 I installed the 32 bit version. I have a blank drive, and would like to install the 64 bit version on that, creating a dual boot system.

What are the steps I need to follow? I'm reasonably intelligent but not tech savvy.