dual-boot-arch

System Info

• Firmware Interface = UEFI
• Architecture = 64-bit
• Manufacturer - Asus
• HDD = 431 GB
• RAM = 8 GB
• OS0 = Win10
• OS1 = Manjaro KDE

Check UEFI or BIOS [Legacy]

• Run msinfo32
• BIOS Mode = EFI or UEFI, not Legacy

Create Bootable USB

• Get Rufus
• Select GPT+UEFI if possible
• Start and remove USB after done.

Create Disk Partition

• Run diskmgmt.msc
• Shrink necessary drives
• Leave the unallocated space

Disable Fast Startup

Control Panel ➤ Hardware and Sound ➤ Power Options ➤ Choose what the power buttons do ➤ Turn on fast startup box [Uncheck]

Disable Secureboot

Settings ➤ Update ➤ Recovery ➤ Advanced ➤ Restart ➤ Troubleshoot ➤ Advanced ➤ UEFI ➤ Restart ➤ Security ➤ Secure Boot [Disable] ➤ Save & Exit

Installation

Boot USB with UEFI ➤ Connect Internet ➤ Launch Installer ➤ Manual partitioning

Partitions

	Size [MB]	Filesystem	Mountpoint	Flags
EFI	512	FAT32	/boot/efi	boot
Swap	10240	linuxswap	-	-
Root	40960	ext4	/	-
Home	Rest	ext4	/home	-

GRUB

Verify Boot Rank

• Do not Reboot
• Remove USB
• Open Terminal
• Enter efibootmgr

Open Windows

• Open BIOS on restart
• Select Windows Boot Manager
• Quickly select Windows from Linux GRUB

Install GRUB

• Run CMD as administrator
• Enter bcdedit /set {bootmgr} path \EFI\manjaro\grubx64.efi
• Reboot

Restore USB

• Run CMD as administrator
• Enter diskpart
• Enter list disk
• Enter select disk x [x = disk number of USB drive]
• Enter clean
• Enter create partition primary
• Enter active
• Enter format fs=fat32 quick
• Enter exit

Remove OS1

Create Recovery Drive

• Search Create A Recovery Drive
• Check Backup system files to the recovery drive
• Choose USB drive and finish

Delete Partitions

• Run diskmgmt.msc
• Format, Delete and Extend drives

Fix Bootloader

Boot to USB with UEFI ➤ Repair PC ➤ Troubleshoot ➤ Command Prompt ➤ Enter bootrec.exe /fixmbr ➤ Restart