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Disk Management

Check Partations

sudo lsblk


loop0 7:0 0 91.1M 1 loop /snap/core/6531
loop1 7:1 0 56.7M 1 loop /snap/google-cloud-sdk/75
sda 8:0 0 10G 0 disk
├─sda1 8:1 0 9.9G 0 part /
├─sda14 8:14 0 4M 0 part
└─sda15 8:15 0 106M 0 part /boot/efi
sdb 8:16 0 10G 0 disk

Format the disk (ext4)

sudo mkfs.ext4 -m 0 -F -E lazy_itable_init=0,lazy_journal_init=0,discard /dev/DEVICE_ID

Mount the new disk

Create a new directory

sudo mkdir -p /folder/directory

Mount disk to the directory

sudo mount -o discard,defaults /dev/sdb /folder/directory

Set read write permission

sudo chmod a+w /folder/directory

Set up auto mount on Restart

Creating backup of current fstab (failsafe 😉)

sudo cp /etc/fstab /etc/fstab.backup

Get the UUID of the disk

sudo blkid /dev/DEVICE_ID

Create an entry in /etc/fstab to mount the /dev/sdb persistent disk at /folder/directory using its UUID.

echo UUID=`sudo blkid -s UUID -o value /dev/sdb` /folder/directory ext4 discard,defaults,nofail 0 2 | sudo tee -a /etc/fstab

Note: Replace dev/sdb if your disk id is different

Verify entry

cat /etc/fstab

Unmounting a File System

This section doc is from (Reference: Linuxize)

To detach a mounted file system, use the umount command followed by either the directory where it has been mounted (mount point) or the device name:


If the file system is in use the umount command will fail to detach the file system. In those situations, you can use the fuser command to find out which processes are accessing the file system:

fuser -m DIRECTORY

Once you determine the processes you can stop them and unmount the file system. Lazy unmount

Use the -l (--lazy) option to unmount a busy file system as soon as it is not busy anymore.

umount -l DIRECTORY

Force unmount

Use the -f (--force) option to force an unmount. This option is usually used to unmount an unreachable NFS system.

umount -f DIRECTORY

Generally not a good idea to force unmount as it may corrupt the data on the file system.