To use the data stored on a disk or partition in Linux, you need to mount it to a folder or mount point. After it's mounted, you can explore the filesystem and read or write files and folders.
You can choose to manually mount disks and partitions whenever necessary, or you can set them to mount automatically when your system starts by creating an entry in the /etc/fstab file. You can mount the disk or partition using its device name, label, or UUID.
$ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT loop0 7:0 0 55.4M 1 loop /snap/core18/1944 loop1 7:1 0 55.4M 1 loop /snap/core18/1932 loop2 7:2 0 217.9M 1 loop /snap/gnome-3-34-1804/60 loop3 7:3 0 219M 1 loop /snap/gnome-3-34-1804/66 loop4 7:4 0 64.8M 1 loop /snap/gtk-common-themes/1514 loop5 7:5 0 51M 1 loop /snap/snap-store/518 loop6 7:6 0 62.1M 1 loop /snap/gtk-common-themes/1506 loop7 7:7 0 51M 1 loop /snap/snap-store/498 loop8 7:8 0 31.1M 1 loop /snap/snapd/10707 loop9 7:9 0 31.1M 1 loop /snap/snapd/10492 sda 8:0 0 20G 0 disk ├─sda1 8:1 0 1M 0 part ├─sda2 8:2 0 513M 0 part /boot/efi └─sda3 8:3 0 19.5G 0 part / sdb 8:16 0 20G 0 disk └─sdb1 8:17 0 20G 0 part sr0 11:0 1 1024M 0 rom
$ blkid /dev/sdb1 /dev/sdb1: UUID="ccab0f8d-3b5b-4189-9da3-23c49159c318" BLOCK_SIZE="4096" TYPE="ext4" PARTUUID="c088a647-01"
$ mkdir disk
$ sudo mount -t ext4 /dev/sdb1 disk [sudo] password for user:
$ df -h Filesystem Size Used Avail Use% Mounted on tmpfs 391M 1.8M 389M 1% /run /dev/sda3 20G 7.1G 12G 39% / tmpfs 2.0G 0 2.0G 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 4.0M 0 4.0M 0% /sys/fs/cgroup /dev/sda2 512M 7.8M 505M 2% /boot/efi tmpfs 391M 112K 391M 1% /run/user/1000 /dev/sdb1 20G 45M 19G 1% /home/user/disk
$ sudo umount /dev/sdb1
$ sudo vi /etc/fstab
/dev/sdb1 /home/user/disk ext4 defaults 0 0
$ sudo mount -a
$ df -h Filesystem Size Used Avail Use% Mounted on tmpfs 391M 1.8M 389M 1% /run /dev/sda3 20G 7.1G 12G 39% / tmpfs 2.0G 0 2.0G 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 4.0M 0 4.0M 0% /sys/fs/cgroup /dev/sda2 512M 7.8M 505M 2% /boot/efi tmpfs 391M 112K 391M 1% /run/user/1000 /dev/sdb1 20G 45M 19G 1% /home/user/disk
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