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I have a laptop (say, Laptop1) with an hard drive (say hdd1) on which Windows 8.1 is pre-installed (with UEFI, I'm told) -- and there is a dual boot with Kubuntu 15.04.

I also have another drive (ssd1), with currently Windows 7 installed (but not pre-installed), which I previously used on another PC.

Now, I want to replace hdd1 with sdd1 into Laptop1, wipe everything on ssd1 and install Xubuntu 15.04.

However, I also want to be able to put hdd1 back into Laptop1 at any time and be able to use the pre-installed Windows 8.1 without any trouble (that is, as if nothing had happened).

How do I need to proceed when installing Xubuntu on ssd1?


Thanks for your help.

  • UEFI seems to forget entries when a drive is disconnected. Not sure if after a couple reboots it will find the ESP - efi system partition and add the Windows 8 entry back into UEFI or not. You can always use efibootmgr from a Ubuntu live installer flash drive to add a Windows UEFI boot entry if required. – oldfred Oct 11 '15 at 14:37
  • @oldfred I'm not familiar with these technicalities (actually, I don't even know what exactly UEFI is). Could you elaborate your explanation a bit? Thanks in advance. – user458292 Oct 11 '15 at 14:41
  • This will be too much info for you now, but at bottom is a list of terms and links with further explanation. ubuntuforums.org/showthread.php?t=2147295 Also has links to many useful UEFI instructions. – oldfred Oct 11 '15 at 14:45
  • @oldfred Thanks, I'll have a look at it. But could you tell me in a few words if I need to do anything in particular when installing Xubuntu on the new drive and if I'll be able to put hdd1 back and use Windows normally after? – user458292 Oct 11 '15 at 14:48
  • @oldfred Also, when you say "you can always use efibootmgr from a Ubuntu live installer flash drive to add a Windows UEFI boot entry if required", do you mean that, when I may want to switch drives again, I just have to put hdd1 back and use this command to repristinate things as they were? – user458292 Oct 11 '15 at 15:26

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