Dual Boot from cloned drive gone wrong. TL:DR at bottom
Just finished building a new desktop as I haven't updated mine in 10+ years. In my order of parts I received the OEM liscense of Acronis True Image HD 2015. Installed Windows 7 x64 Ultimate to one of the two SSD's that I ordered, and initially used the other SSD as a seperate drive to run the games that I play online. Decided I would give Windows 10 a try as it is still currently offered as a free upgrade, and didn't want to immediately commit to the new OS on the off chance I wasn't an immediate fan, but still wanted to keep it installed to have the chance to learn it. Installed the Acronis software to prepare for when I was ready to make the switch. Migrated all my game files to a 1TB storage drive and formatted the extra SSD drive. Made a clone of the OS installed SSD to the newly formatted SSD (with an included new text document on the desktop titled "This is the F: Primary Backup Drive" so that I would be able to tell the two different drives apart from original to clone.
Here's where the trouble began. Upgrade on the clone drive initially went off without a hitch during the download phase. When I returned after about 30 minutes I found out the download was finished and the upgrade was ready to roll. Restart PC to begin upgrade, select the clone drive for the upgrade and let it do its thing. During the upgrade process the PC restarts several times, and every time it would restart for configurations I would direct it to the clone drive in start up boot list. Left the PC alone for a while to continue the upgrade process only to discover that it had restarted the PC again, only this time I was not at the keyboard to direct it to the clone drive to continue, and across the screen is the error message of the MBR not being found, etc! After shouting a few words I don't prefer my toddler to hear from my mouth I restarted the PC hoping that if I directed the boot device priority that at the very least the cloned drive with Windows 10 would be up and running, to my relief it was. Allowed Windows 10 to finish configuring and started looking for any forum that might have an insight as to why the MBR was removed from my original SSD and put in tandem with the cloned SSD, and also to find out if I were to one day decide that I was not a fan of the Windows 10 OS (which I'm not impressed as of this moment, aside from the issue I'm addressing) and wanted to reformat the cloned drive and go back to using it as a seperate drive for my online games and stick with my copy of Windows 7, will I have to go back and fix the MBR.
TL:DR Thought I was clever and cloned one SSD to another SSD to upgrade from Windows 7 to Windows 10, and lost the MBR for Windows 7 as its attached now to the cloned SSD with Windows 10


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