![]() ![]() If you see an asterisk in the Gpt column corresponding to the HDD, then is GPT. Launch diskpart from cmd and type list disk. Here is how you can check the HDD in Windows. Windows booted from MBR cannot be installed on GPT disk. You just have to know how the primary OS was installed and boot from the installation media of the second one in the right mode. Modern OSes (Windows newer than 7 and 64 bits Ubuntu newer than 12.04.2 and 64 bits) can be booted and installed in both EFI and BIOS modes. What is the problem here? Well, if you have a GPT partitioned disk (by an installation started in EFI mode) and try to install Windows by booting it in compatibility mode (MBR), it will recognize the drive partitions but will ask you to format the entire HDD. Otherwise, it is very probable to be MBR, no matter if the PC supports UEFI. If the OS has been installed in EFI mode, the partition table is GPT. It's just the same partition table information it used, also known as MBR (master boot record). Of course I'm not talking about the operating system. But now I have to reinstall one of the OSes. Here are some common situations that we will talk about: Because Ubuntu is one of the most popular Linux distributions, it will be used during this tutorial. This post will give solutions to some common situations. Before wiping the whole HDD to install Windows, consider dual booting. Several manufacturers also started to sell preinstalled Linux computers. That's because they can't find an alternative for their everyday apps on Linux or can't play some games. But before completely giving up Windows, many users want to have both OSes on their PCs. Linux distributions are becoming more and more popular. See how to dual boot Windows and Linux Ubuntu, what you do to modify or reinstall each operating system without affecting the other and how to remove one of them. ![]()
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