Не могу удалить\создать раздел. fdisk сообщает, что он занят, кем занят непонятно

root@archiso ~ # mount         
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
sys on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
dev on /dev type devtmpfs (rw,nosuid,relatime,size=8121480k,nr_inodes=2030370,mode=755,inode64)
run on /run type tmpfs (rw,nosuid,nodev,relatime,mode=755,inode64)
efivarfs on /sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
copytoram on /run/archiso/copytoram type tmpfs (rw,relatime,size=12246648k,mode=755,inode64)
cowspace on /run/archiso/cowspace type tmpfs (rw,relatime,size=262144k,mode=755,inode64)
/dev/loop0 on /run/archiso/airootfs type squashfs (ro,relatime,errors=continue,threads=single)
airootfs on / type overlay (rw,relatime,lowerdir=/run/archiso/airootfs,upperdir=/run/archiso/cowspace/persistent_/x86_64/upperdir,workdir=/run/archiso/cowspace/persistent_/x86_64/workdir)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,inode64)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
cgroup2 on /sys/fs/cgroup type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
bpf on /sys/fs/bpf type bpf (rw,nosuid,nodev,noexec,relatime,mode=700)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=34,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=14475)
debugfs on /sys/kernel/debug type debugfs (rw,nosuid,nodev,noexec,relatime)
tracefs on /sys/kernel/tracing type tracefs (rw,nosuid,nodev,noexec,relatime)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,pagesize=2M)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,size=8164432k,nr_inodes=1048576,inode64)
mqueue on /dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime)
fusectl on /sys/fs/fuse/connections type fusectl (rw,nosuid,nodev,noexec,relatime)
configfs on /sys/kernel/config type configfs (rw,nosuid,nodev,noexec,relatime)
ramfs on /run/credentials/systemd-firstboot.service type ramfs (ro,nosuid,nodev,noexec,relatime,mode=700)
ramfs on /run/credentials/systemd-sysctl.service type ramfs (ro,nosuid,nodev,noexec,relatime,mode=700)
ramfs on /run/credentials/systemd-sysusers.service type ramfs (ro,nosuid,nodev,noexec,relatime,mode=700)
ramfs on /run/credentials/systemd-tmpfiles-setup-dev.service type ramfs (ro,nosuid,nodev,noexec,relatime,mode=700)
ramfs on /etc/pacman.d/gnupg type ramfs (rw,relatime)
ramfs on /run/credentials/systemd-tmpfiles-setup.service type ramfs (ro,nosuid,nodev,noexec,relatime,mode=700)
ramfs on /run/credentials/systemd-resolved.service type ramfs (ro,nosuid,nodev,noexec,relatime,mode=700)
tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=1632884k,nr_inodes=408221,mode=700,inode64)
root@archiso ~ # cat /proc/swaps
Filename                                Type            Size            Used            Priority
root@archiso ~ # 

root@archiso ~ # lsblk
NAME      MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINTS
loop0       7:0    0   673M  1 loop  /run/archiso/airootfs
sda         8:0    0 223.6G  0 disk  
└─sda1      8:1    0 223.6G  0 part  
  └─md127   9:127  0 223.4G  0 raid1 
sdb         8:16   0 223.6G  0 disk  
sdc         8:32   0   1.8T  0 disk  
├─sdc1      8:33   0    16M  0 part  
└─sdc2      8:34   0   1.8T  0 part  
sdd         8:48   1   3.7G  0 disk  
├─sdd1      8:49   1   778M  0 part  
└─sdd2      8:50   1    15M  0 part  
sr0        11:0    1    24M  0 rom 

root@archiso ~ # cat /proc/mdadm
cat: /proc/mdadm: No such file or directory