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Windows 7 & 10 dual boot question(s)
When first installing Win7 Pro x64 to my desktop a few years ago, it was done in BIOS/CSM/MBR mode.
I want to keep W7, and also install W10 Pro, with a view to phasing out W7 (by the time all support stops in 2020), but have each on a separate SSD.
I'm considering 3 possible scenarios:
1. Dual boot 7 & 10, both as CSM/BIOS/MBR (W10 install only).
2. Dual boot 7 & 10, both as UEFI/GPT, which would require me to (first) reinstall W7.
3. Install 10 only as UEFI/GPT, and select the os disk from the firmware boot menu.
My data is on a separate MBR HDD, and backups on external MBR HDDs.
Both 7 & 10 are full 'retail' versions (W7 disc/W10 USB)
I'm aware of issues with firmware Secure Boot & os Fast Boot, Windows Update problems regarding re-installation of W7, and would be disconnecting/disabling other drives during os installation.
Any advice as to which (if any) of the above scenarios is preferable, and other potential issues you can foresee would be appreciated.