Please do not answer this unless you know EXACTLY what you are talking about; guesses and partial answers and theories are not appreciated on this one.
I have Windows 10 installed on my Lenovo laptop. The Disk is GPT. I want to convert to MBR, even though this is generally considered a "downgrade".
Per the Windows Disk Management utility, there are several partitions, as follows:
(hidden) 1000MB Recovery Partition
(hidden) 260MB EFI System Partition
(hidden) 1000MB OEM Partition
C: 890GB System partition (Boot, Page File, Crash Dump, Primary Partition)
D: 25GB NTFS Primary partiton
(hidden) 14GB Recovery Partition
I would like to back everything up using Acronis Truimage 2016, use diskpart to wipe the drive and convert it to MBR, and then bring back only what I need to bring back, and have it be bootable.
I don't particularly need the recovery partitions, as I've created an installer thumbdrive for the OS.
So, specifically: Do I need to change anything in the laptop's BIOS (like change UEFI to Legacy)? If so, at what point in the process would I do this?
Do I need to restore the EFI System partition if the disk will be MBR rather than GPT?
If, using Acronis, I just restore C: and D:, do I need to do anything in particular so that it will boot from C: when I'm done? For example, make the partition active, or primary?
I suspect that Acronis will back up and restore a master boot record.
Will Acronis figure out that the master boot record needs to say to boot from C:, and make the necessary changes to it? Or do I need to do something in particular to ensure that I will be able to boot from C: after the restore?