Drive letters/numbers keep changing

I'm running Win 10 Pro.

I have two hard drives in my PC, both are exactly the same - I use Acronis TrueImage to regularly clone one drive to another as a backup. I've done this for a long time on my old PC running Win 7 64-Bit but have recently bought another PC (spec'd by myself) that's running Win 10 Pro.

I should say that this doesn't affect the booting of the PC, it always boots the correct drive with the most current data, it's just that if I go into Disk Management the PC sometimes states that drive 0 has letter D assigned to it and drive 1 has letter C assigned.

What SHOULD be the case is that drive 0 is always C and drive 1 is always D. The only way that I can revert it to this order is by messing around in the BIOS and often swapping the SATA cables around.

I should re-stress that the PC still always boots to the correct drive with the most recent data (I can tell by the contents), it's just the numbering/letters that get swapped around.

I suspect that Windows updates (any updates) and subsequent reboots are causing the problem.

How can how set things so that drive 0 is always C and drive 1 is always D?

Part of the reason that I want to do this is because when I clone the drives I like to clone low to high, so drive 0 overwrites drive 1 - with the swapped letters/numbers I may one day, by accident, clone OLD data over NEW data .........

My PC has an ASUS Prime B350-Plus motherboard, AMD Ryzen 5 1600 CPU, NVIDIA GeForce GTX 1060 6GB video card, 2 x 2TB hard drives, 8GBytes RAM, DVD/Blu-ray drive

The problem is when windows sees a new drive it writes a signature to it so it know what it is if you clone a drive and both are in at the same time windows can get confussedas it sees the same signature for both drives. The o/s doesnt always boot disk 0 it boot the one with an active parition.

Its simpler to make iamges to the second drive and with compression you can get a lot of images on a drive so you can role back if you image a drive then find its infected you have both infected with images you can go back to an earlier image

Thanks for the replies. The thing is, I didn't have this problem with Windows 7. So what in Windows 10 doing that is different?

CountMike said:

Nothing is different in that regard with disks/partitions and their letters. It's all same since first DOS.

Thanks, but why then do I have this issue under Win 10 and not Win 7 ? :)