Hello friends, this post is very important for users with dual OS installed, you should know if you are using a dual operating system on your computer or laptop. You have a laptop, but use the dual OS, sometimes you have a problem, so you decide to reset or reinstall your PC or laptop. If you do it will affect the other OS.
What do you mean by reset?
The operating system is installed on the hard drive partition. The location of the operating system is recorded in some places, such as the Master Boot Record (MBR).
If you have dual boots, reinstall or reset any operating system and if MBR rewrites it, you will not be able to find your other operating system. Although the OS will still be there. You need to find the location where the OS is installed and re-enter the MBR or EFI so it can be loaded by the BIOS.
If the partition containing the other operating system (OS) is overwritten or reset by the first OS, you may lose the other OS as well.
Another thing to note is that both OSes may have multiple partitions and partition mapping, for example a partition is mapped to root (/) / boot, to ensure that they are not compromised during reset.
Because it is difficult to manage, I recommend using only one core OS installed and using the Oracle Virtual Box to install other OS as needed.
Some benefits are:
Data Protection – If the first OS is overwritten, you can back up your virtual box OS and restore it anywhere.
Installing new software is safe – you can clone the virtual machine before installing any new or insecure software and roll it up with a single click if there is any problem.
Sharing the same virtual machine on devices does not require multiple settings
Take a backup copy of the OS in minutes and export and save it to back up media.
If you have deleted one of the two, you will need to re-create the dual boot after reinstalling the previously deleted OS. If you do not, the boot will only recognize the rest. What’s more, no OS can boot until you recreate the MBR. When you delete one of them, you can restart it and the message ‘Missing operating system’ will prevent the rest of the OS from running.
Then, you need to recreate your MBR with your Windows original CD or Live USB.
If any Linux OS is uninstalled on Dual Boot with Windows OS, you will need to reinstall Linux with Group 2, the equivalent dual boot that appears on the Windows screen when two OS or more are installed.
If you are trying to reset windows in a laptop that has both Linux and windows it will only affect the Windows OS nothing will happen to Linux. Same in the case of Linux OS. If you are trying to delete partitions which contains another operating system only then it will have some effect on the other. Else you will not face any issues.
If by reset you mean formatting and reinstalling a Windows OS, another OS being a lower version of Windows, then the Windows boot loader will recognize and reset both the OS. However and it may or may not work if you’re resetting a lower Windows OS version over WIN 10.
If you’re dual booting with a Linux distro, the Linux partition/ boot loader will surely be over-written by the Windows boot loader. In that case, you’ll need to reset the Linux GRUB bootloader.
And finally if you’re resetting a Linux OS, it will most probably recognize the Windows partitions and bootloader and will automatically resolve it for you. Therefore, Linux systems should always be installed last or later after Windows.
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