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So I have installed Ubuntu to a 1 TB hard drive.(I have a laptop) I want to install Windows 7 to another 500 Gb hard drive and be able to switch out between the two hard drives. Is this possible? Will this cause a fuss with GRUB / Windows bootloader? Does having only one HDD slot in my laptop affect this? Help appreciated.

marked as duplicate by David Foerster, Anwar, Eric Carvalho, Zanna, TheWanderer Nov 9 '16 at 0:15

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  • is this other hard drive a usb external or will you actually be swapping the internal drive with this other one? – Klyn Oct 10 '16 at 23:10
  • I will be swapping the internal hard drive out. – EpicCode Oct 10 '16 at 23:11
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    @EpicCode I wouldn't be swapping drives in my laptop 1 TB is enough for both OSs. – WinEunuuchs2Unix Oct 10 '16 at 23:26
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Install the other hard drive and install Windows like you normally would. Then you can swap them with no issue.

One thing you might see is the internal system clock will be incorrect when you go back to Windows, because Linux uses GMT while Windows uses your local time zone. Windows can auto update the clock when its online but it's something you will have to look out for. Here is a registry edit you can do in Windows to fix this.

  • OK! Thank you! Just wanted clarification before installing Windows. – EpicCode Oct 11 '16 at 1:07
  • Is there any chance that installing the two OSes in different boot modes (EFI and legacy) would cause any problems? – wjandrea Oct 11 '16 at 1:40
  • yes make sure to keep the same boot modes for both – Klyn Oct 11 '16 at 1:50
  • If you don't see Windows as a GRUB boot option then ~> After installing Windows to the 2nd HDD, you may need to possibly use sudo update-grub. – David your friend Oct 11 '16 at 2:41
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    @David-yourfriend Windows shouldn't be listed as a boot option because the two HDDs won't both be installed at the same time. – wjandrea Oct 11 '16 at 4:19

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