NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 1.8T 0 disk
└─sda1 8:1 0 1.8T 0 part /data
sdb 8:16 0 232.9G 0 disk
├─sdb1 8:17 0 300M 0 part /boot/efi
├─sdb2 8:18 0 223.8G 0 part /home
│ /
└─sdb3 8:19 0 8.8G 0 part [SWAP]
sdc 8:32 1 57.3G 0 disk
├─sdc1 8:33 1 57.2G 0 part /run/media/xircon/ventoy
└─sdc2 8:34 1 32M 0 part
So:
sudo mount /dev/sdb1 /mnt #efi
sudo mount /dev/sdb2 /mnt/root -o subvol=@
sudo arch-chroot /mnt
Sorry, really really warm today and we brits do not function well unless it is cold and wet 