Steps in fdisk for /dev/sdb

1. Create the Boot Partition (500 MB)

1. Press n to create a new partition.
2. Choose p for a primary partition.
3. Enter 1 for the partition number.
4. Press Enter to accept the default starting sector.
5. Enter +500M for the size.
6. Press t to change the partition type.
7. Enter 83 for Linux filesystem (or b for W95 FAT32 if using BIOS boot).

2. Create the EFI Partition (500 MB)

1. Press n to create a new partition.
2. Choose p for a primary partition.
3. Enter 2 for the partition number.
4. Press Enter to accept the default starting sector.
5. Enter +500M for the size.
6. Press t to change the partition type.
7. Enter ef for EFI System.

3. Create the Swap Partition (8 GB)

1. Press n to create a new partition.
2. Choose p for a primary partition.
3. Enter 3 for the partition number.
4. Press Enter to accept the default starting sector.
5. Enter +8G for the size.
6. Press t to change the partition type.
7. Enter 82 for Linux swap.

4. Create the Root Partition (remaining space)

1. Press n to create a new partition.
2. Choose p for a primary partition.
3. Enter 4 for the partition number.
4. Press Enter to accept the default starting sector.
5. Press Enter again to use the remaining space.

5. Write Changes and Exit

1. Press w to write the changes and exit fdisk.

Formating partitions

Format the boot partition

mkfs.ext4 /dev/sdb1

Format the EFI partition

mkfs.fat -F32 /dev/sdb2

Format the root partition

mkfs.ext4 /dev/sdb4

Initialize the swap partition

mkswap /dev/sdb3

Mount these drives

Mount the root partition /mnt

mount /dev/sdb4 /mnt

Create and mount the boot partition /boot

mkdir /mnt/boot

mount /dev/sdb1 /mnt/boot

Create and mount the EFI partition /efi

mkdir /mnt/boot/efi

mount /dev/sdb2 /mnt/boot/efi

Enable the swap partition

swapon /dev/sdb3

Arch base install KDE

pacstrap /mnt base linux linux-firmware

Generate fstab

genfstab -U /mnt >> /mnt/etc/fstab

Arch chroot into /mnt

arch-chroot /mnt

Chroot tuning

Create user

useradd -m -G wheel -s /bin/bash yourname

Passwd the user

passwd newusername

Edit visudo envs

visudo

and enable or copy

%wheel ALL=(ALL) ALL

Install plain clean plasma env

pacman -S plasma-desktop sddm vim nano networkmanager git github-cli ufw

Create grub files

pacman -S grub efibootmgr

grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=grub

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

Last part

exit

reboot

It should start with grub if not then shady boy you can try again these steps because linux is awesome <3