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I rarely use disk commands that why I often forget them and spend minutes to find the right command that I already used.
Here are some of the most useful disk commands I use:
# List all existing disks fdisk -l # Show mounted partitions, modify them in /etc/fstab, to mount use "-all" argument mount # Build a RAID 1 from 2 disks /dev/sda3 & /dev/sdb3 mdadm -C /dev/md3 --level=raid1 --raid-devices=2 /dev/sda3 /dev/sdb3 # Details about RAID /dev/md3 mdadm --detail /dev/md3 # Update mdadm.conf, delete lines before mdadm --examine --scan >> /etc/mdadm/mdadm.conf # Format /dev/md3 in ext4 mke2fs -t ext4 /dev/md3 |