Help on how to boot from old SSD on newest Motherboard

[gab]

Hi,

I have a PC with a motherboard ASROCK H510M-HDV/M2 retail and a disk SSD Patriot P300 512GB NVME M.2 PCIE GEN 3 X4.
On hand I have an older SSD Apacer 240GB with Windows 10 Pro on it.
I want (and need) to set the old Apacer as the boot drive but :

In the BIOS
1. It is recognized as a SATA disk
2. It does not show up in the boot menu. Only the newer NvMe is shown in the boot manager.
3. When I remove the NVME disk, there is no boot disk available.

There must be some BIOS tweak to make the "legacy" SSD as boot disk but I cannot find it.
Any help appreciated.

Thanks

 

[root]

Hey @gab, welcome to CF.

If you're certain the SSD has a copy of windows that's set up to boot in legacy BIOS mode, the first place I would explore in those BIOS menus is the 'CSM' compatibility support module - you should find the option to enable legacy boot in there hopefully.