I have a Gigabyte p35x laptop it came with 1 SSD, 1HDD, and i can replace the optical drive with another HDD. It has Windows 10 installed on the SSD. So i removed my HDD(having windows 7) from a previous laptop, and replaced the optical drive with that. Now how can i boot on the second HDD(windows7) ? when i try from the bios to choose the booting device, i have only one option which is the SSD (NVMe)

Any idea how i can set dual boot ? so that i can choose between Windows 10 or 7 when it boots ?

  • Its worth remembering many SKUs of windows don't have transferable licences or activation locked to specific hardware. – Journeyman Geek Apr 3 '17 at 10:51

If the Windows 7 disk is visible when booting into Windows 10, then you could add it to the boot menu by using the tool bootrec.exe that is built-in to the Windows recovery environment.

This is the procedure :

  1. Hold down either SHIFT key while clicking on Restart, available from any Power icon, and wait for the Advanced Startup Options menu to appear.​ In case of any difficulty, alternate methods to get to this menu are described here.

  2. Open Command Prompt from Advanced Startup Options or System Recovery Options menu.

  3. At the prompt, type the command Bootrec.exe /ScanOS, to determine if the system recognizes windows 7.

  4. To add Windows 7 to the boot menu execute: Bootrec.exe /RebuildBcd, which will scan the disks for all compatible installations with Windows and let you choose which to add to the Boot Configuration Data (BCD) store.

  • Use classic MBR boot mode if you have UEFI BIOS.

  • Connect only one drive. Install Operating system on it.

  • Disconnect the initial drive, connect second one, install second operating system there.

  • Reconnect the initial drive.

  • Select which one you want to boot from using the BIOS hot-keys.

  • Is it not possible to do that without the need to reinstall ? Because my system is up and running with all my programs tools and settings... And I really want to avoid reinstall again – Xsmael Apr 3 '17 at 11:38
  • You can do it without reinstall by just rebuilding the boot sector of the not working one. Connect it, start the OS by it's installation disk, open a command prompt and fix the MBR. – Overmind Apr 5 '17 at 8:17

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.