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Message: <blockquote data-quote="rasmasyean" data-source="post: 551101" data-attributes="member: 50625">How exactly does this work?In the past I installed Windows 8.1 with Windows 7 on an old HD.I forgot exactly what I did, but it turned into a multi-boot prompting startup.Then I found out later on when I removed one of the HD's, it can no longer boot.Recently, I did a Windows 8.1 with another Windows 8.1 on the first HD and it had the mutli-boot thing.So I reinstalled it with the old HD removed.So when I boot the new HD with the old HD reconnected, it works as intended.When I boot the old HD, it gives me THREE Windows 8.1 options to select.How did this happen, as I didn't even have the old HD connected when I installed the OS.  Does it detect a new OS and modify itself while you're booting it?Is there a way to correct it? i.e. turn it into a single-boot HD?</blockquote>