Here is the procedure for install of windows on nvme drive. (this won't apply if you have fast boot time into windows 10, your nvme drive should be sub 23 seconds to boot into default windows 10, as rough guide)
1 - Make sure you unplug all SATA and USB drives, the M.2 drive has to be the only drive installed.
2 - Go into the bios, under the boot tab there is an option for CSM, make sure it is disabled.
3 - Click on secure boot option below and make sure it is set to other OS, Not windows UEFI.
4 - Click on key management and clear secure boot keys.
5 - Insert a USB memory stick with a UEFI bootable iso of Windows 10 on it. A Windows DVD won't work unless you've created your own UEFI Bootable DVD.
6 - Press F10 to save, exit and reboot.
7 - Windows will now start installing to your NVME drive as it has its own NVME driver built in, I don't think this would work with previous versions.
8 - When the PC reboots hit F2 to go back into the BIOS, you will see under boot priority that windows boot manager now lists your NVME drive.
9 - Click on secure boot again but now set it to WIndows UEFI mode.
10 - Click on key management and install default secure boot keys
11 - Press F10 to save and exit and windows will finish the install.
Once you have Windows up and running, shutdown the PC and reconnect your other SATA drives. Typically you don't put anything on SATA port 1 as this is now reserved for the NVME drive and may cause a conflict (so don't use it unless you have no choice). I cant confirm or deny if this would also effect sata port 2 given your running a second drive (maybe avoid second one as well, if you can).
In regards to transfer between two drives, make sure your using Samsung nvme driver, the default windows one tends to degrade like your seeing. Snappy driver installer is one way to get the best optimal drivers for your system. Use the lite version
https://sdi-tool.org/download/Hope you find this of help
😉
