🚀 Arch Linux Dual Boot Guide (Speedrun Version)

1. Prepare Windows

• Shrink Windows Partition
  • Open diskmgmt.msc, shrink C: by 50GB+ (Unallocated Space).
• Check Boot Mode
  • Press Win + R, type msinfo32, check BIOS Mode:
    • UEFI → Continue with UEFI
    • Legacy (MBR) → Use MBR installation

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2. Boot into Arch Live USB

• Create USB:

  dd if=archlinux.iso of=/dev/sdX bs=4M status=progress
  

• Boot from USB in BIOS.

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3. Partition the Disk

lsblk  # Identify your disk (e.g., /dev/nvme0n1)
cfdisk /dev/nvme0n1

• Keep Windows partitions
• Create Linux Root Partition (ext4, 50GB+)
• (Optional) Create Swap Partition (8GB)

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4. Format & Mount

mkfs.ext4 /dev/nvme0n1p3
mount /dev/nvme0n1p3 /mnt
mkdir -p /mnt/boot/efi
mount /dev/nvme0n1p1 /mnt/boot/efi  # Use Windows' EFI partition

mkswap /dev/nvme0n1p4
swapon /dev/nvme0n1p4

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5. Install Arch

pacstrap /mnt base linux linux-firmware vim
genfstab -U /mnt >> /mnt/etc/fstab
arch-chroot /mnt

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6. Basic Config

ln -sf /usr/share/zoneinfo/Region/City /etc/localtime
hwclock --systohc
echo "LANG=en_US.UTF-8" > /etc/locale.conf
echo "archlinux" > /etc/hostname
passwd  # Set root password

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7. Install & Configure GRUB

pacman -S grub efibootmgr os-prober
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=GRUB
os-prober
grub-mkconfig -o /boot/grub/grub.cfg

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8. Finish Installation

exit
umount -R /mnt
reboot

• Select Arch Linux from GRUB 🎉
• If Windows is missing from GRUB:

  os-prober
  grub-mkconfig -o /boot/grub/grub.cfg
  

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Done! 🚀