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#11
If you previously had Windows installed on a different drive and then installed Windows on Disk 1, Windows would not install a hidden System Partition on Disk 1, it would use the already existing System Partition on the previous Windows drive. If you were to remove that drive, then Windows will not boot. The other way is to clone just the Windows Partition and not the Hidden System Partition.
As for Safe Mode, go to Settings/Update and security/Recovery/Advanced Startup/Restart Now/Trouble Shoot it will give you Safe Mode as one of the options.
If you can't boot, just keep spamming F8. You may have to restart several times to get to Trouble Shooting.