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Installation: Reworked Dual Boot guide
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‎src/content/docs/installation/installation_on_root.mdx‎

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@@ -225,88 +225,106 @@ The partition table for each boot manager varies. Please follow the correct inst
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</Tabs>
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## Dual Booting
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## Dual Booting Windows and CachyOS
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:::note[This guide assumes that Windows is already installed on the system and you decided to install CachyOS alongside it. ]
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:::note[This guide assumes that Windows is already installed on the system and you decided to install CachyOS alongside it sharing the same drive.]
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:::
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:::caution
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Make sure that Windows Fast Startup is disabled.
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Dual booting Windows and Linux is not 100% reliable. Windows updates can break the bootloader by overwriting the EFI partition.
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In some cases issues might never occur, but for some users it can be a recurring problem.
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One way to avoid this issue is to install each operating system on separate drives.
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:::
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:::note[systemd-boot and rEFInd should automatically detect Windows and add it to the boot menu.]
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:::
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### Prerequisites
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- Disable Windows Fast Startup and Hibernation
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- Open Windows Powershell as Administrator and execute the following command:
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```ps
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powercfg /H off
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```
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Reboot the system to make sure the changes take effect.
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- Windows BitLocker must be disabled
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- Checking if BitLocker is enabled:
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```ps title='Open a Command Prompt as administrator and execute the following command'
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manage-bde -status
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```
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If Encryption Method shows as `None`, then BitLocker is disabled.
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- Secure Boot must be disabled.
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- A +30GB empty partition
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- Guide on how to shrink a Windows partition:
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- Press `Win + R`, type `diskmgmt.msc`, and press Enter to open Disk Management.
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- Identify your main Windows partition (usually C:) and right-click on it.
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- Click on `Shrink Volume...` and specify at least **30720MB** (30GB) and click on `Shrink`.
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- Booteable USB with CachyOS
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- Refer to the [Creating a Bootable CachyOS USB Drive](/installation/installation_prepare#creating-a-bootable-cachyos-usb-drive) section.
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### Installing CachyOS
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<Steps>
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1. Boot into the CachyOS ISO and click on **Launch Installer**.
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2. Select your preferred Boot Manager. Check the [Boot Managers](/installation/boot_managers) section for more information.
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3. Choose your Language, Timezone and Keyboard Layout.
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4. Make sure your Windows drive is selected on the **Select storage device** field.
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5. Select `Replace a partition` with `btrfs` as the filesystem.
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6. Highlight your empty partition below **Select a partition to install on**
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:::note[Usually it shows as a dark gray color and the size should match the one you created in Windows.]
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:::
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7. Choose your [Desktop Environment](/installation/desktop_environments) and select the packages you want to install.
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8. Create a user and set a password for the root account.
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9. Carefully review the installation summary on the Overview Page. If everything looks correct, click on **Install Now** to proceed with the installation. If you need to make any changes, go back and adjust the settings as necessary.
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10. After the installation is complete, reboot the system.
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:::note
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If after rebooting, the system boots directly into Windows. Reboot again and enter the BIOS/UEFI settings. Look for the Boot Menu order and ensure that `CachyOS` or the boot manager you selected during installation is set as the first boot option.
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:::
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</Steps>
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### Adding Windows entry to GRUB or Limine
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<Tabs>
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<TabItem label='systemd-boot'>
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**We need to copy the Windows EFI binaries to the Linux EFI partition so that the boot manager can recognize them.**
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<Steps>
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1. Locate the **Windows EFI partition** with `lsblk`
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```sh title='Execute this command in the terminal'
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lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT
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```
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```sh title='Example output'
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NAME FSTYPE SIZE MOUNTPOINT
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zram0 15.3G [SWAP]
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nvme0n1 476.9G
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├─nvme0n1p1 vfat 100M
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├─nvme0n1p2 16M
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├─nvme0n1p3 ntfs 234.4G
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├─nvme0n1p4 ntfs 830M
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├─nvme0n1p5 vfat 2G /boot
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└─nvme0n1p6 btrfs 239.6G /var/tmp
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```
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EFI partitions are almost always formatted as `FAT32/vfat`. Since `nvme0n1p1` does not have a Linux mount point, we can assume that this partition is the Windows EFI partition.
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2. Temporarily mount the Windows EFI partition
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```sh
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sudo mkdir /mnt/WinBoot
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sudo mount /dev/nvme0n1p1 /mnt/WinBoot # Replace `nvme0n1p1` with the name of the Windows EFI partition.
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```
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3. Copy the EFI binaries from the **Windows EFI partition** to the **Linux EFI partition**:
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```sh
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sudo cp -r /mnt/WinBoot/EFI/* /boot/EFI
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```
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4. Unmount the previously mounted partition, and Windows should appear in the boot menu on the next startup.
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```sh
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sudo umount /mnt/WinBoot
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sudo rm -r /mnt/WinBoot
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```
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</Steps>
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</TabItem>
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<TabItem label='GRUB'>
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**GRUB uses os-prober to automatically detect the Windows EFI partition and add it to the boot menu.**
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<Steps>
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1. Install and execute **os-prober**
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```sh
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sudo pacman -S os-prober
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sudo os-prober
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```
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2. Enable **os-prober** in the GRUB configuration file
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```sh title='Press CTRL+S to save and CTRL+Q to exit from Micro'
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sudo micro /etc/default/grub
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# /etc/default/grub
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# Probing for other operating systems is disabled for security reasons. Read
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# documentation on GRUB_DISABLE_OS_PROBER, if still want to enable this
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# functionality install os-prober and uncomment to detect and include other
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# operating systems.
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GRUB_DISABLE_OS_PROBER=false
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sudo grub-mkconfig -o /boot/grub/grub.cfg
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```
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**Windows should now be added to the boot menu.**
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</Steps>
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</TabItem>
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<TabItem label='GRUB'>
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<Steps>
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1. Open a terminal and enter the following command:
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```bash
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sudo micro /etc/default/grub
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```
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2. Find the line that says `GRUB_DISABLE_OS_PROBER=false` and remove the `#` at the beginning of the line to uncomment it.
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3. Save the file by pressing `CTRL + S` and quit the editor by pressing `CTRL + Q`
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4. Regenerate the GRUB configuration file by executing:
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```bash
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sudo grub-mkconfig -o /boot/grub/grub.cfg
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```
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If in the output you see a line similar to:
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```bash title='Example'
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Found Windows Boot Manager on /dev/nvme0n1p1@/EFI/Microsoft/Boot/bootmgfw.efi
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```
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Then Windows has been successfully added to the GRUB boot menu.
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5. Reboot the system, and Windows should now appear in the GRUB boot
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</Steps>
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</TabItem>
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<TabItem label='Limine'>
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Limine provides a script that can be used to add Windows to the boot menu.
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Open a terminal and execute the following command:
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```bash
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sudo limine-scan
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```
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Reboot and Windows should now appear in the Limine boot menu.
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</TabItem>
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</Tabs>
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### [Video Tutorial](https://www.youtube.com/watch?v=mVXONaHZvFU)
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Credits go to [Ksk Royal](https://www.youtube.com/@kskroyaltech) for creating this video tutorial and being the inspiration for this section.

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