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Alienware M14x second hard drive and Dual System Boot

Hi guys, please help me with the following issue.  I have bought a new hard drive for my Dell Alienware  M14x laptop and installed it instead of my CD drive. Everything is fine and when I boot my alien I see my second hard drive instead of CD drive.

But now I want to install a second windows 7 system on it. However, I cannot choose in Bios to load from my second drive. Is that possible to do somehow??? Maybe there is other way???

Thanks!!!!

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RE: Alienware M14x second hard drive and Dual System Boot

If the system is running in UEFI mode, Windows 7 must be installed in GPT mode to a GPT-partitioned disc.

If windows 7 is installed in MBR mode (the usual mode for it), you must turn off secure boot and enable legacy BIOS to boot the disc (and reverse the settings to boot windows 8, since you cannot change the boot mode  unless you reinstall Windows 8 on the master disc).

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