lsblk Command
Beginner System Information man(1)List information about block devices (disks)
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📅 Updated: Apr 29, 2026
SYNTAX
lsblk [OPTION]...
What Does lsblk Do?
lsblk lists information about all available block devices (disks, partitions, LVM volumes, etc.). It shows device names, sizes, types, mount points, and filesystem types in a tree format.
lsblk is the primary tool for understanding disk layout — which disks are present, how they are partitioned, and where they are mounted. It presents information in a clear hierarchical tree showing disks and their partitions.
lsblk reads from sysfs and does not require root privileges, making it safer and faster than fdisk -l for viewing disk information.
lsblk is the primary tool for understanding disk layout — which disks are present, how they are partitioned, and where they are mounted. It presents information in a clear hierarchical tree showing disks and their partitions.
lsblk reads from sysfs and does not require root privileges, making it safer and faster than fdisk -l for viewing disk information.
Options & Flags
| Option | Description | Example |
|---|---|---|
| -f | Show filesystem type, label, UUID, and mount point | lsblk -f |
| -l | List format (no tree) | lsblk -l |
| -o | Specify output columns | lsblk -o NAME,SIZE,TYPE,MOUNTPOINT,FSTYPE |
| -d | Show only disk devices (no partitions) | lsblk -d |
| -p | Print full device paths | lsblk -p |
| -J | JSON output | lsblk -J |
| -b | Print sizes in bytes | lsblk -b |
Practical Examples
#1 List all block devices
Shows disks and partitions in tree format.
$ lsblk
Output:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 500G 0 disk
├─sda1 8:1 0 512M 0 part /boot/efi
├─sda2 8:2 0 499G 0 part /
sdb 8:16 0 1T 0 disk /data
#2 Show filesystems
Shows filesystem type, label, UUID, and mount point.
$ lsblk -f#3 Custom columns
Shows only specific columns.
$ lsblk -o NAME,SIZE,TYPE,MOUNTPOINT,FSTYPE#4 Disks only
Shows only disk devices with model names.
$ lsblk -d -o NAME,SIZE,MODEL
Output:
NAME SIZE MODEL
sda 500G Samsung SSD 870
sdb 1T WD Blue
#5 JSON output
Outputs device information in JSON format for scripting.
$ lsblk -J#6 Full paths
Shows full device paths (/dev/sda1 instead of sda1).
$ lsblk -p -o NAME,SIZE,MOUNTPOINTTips & Best Practices
Use -f for UUIDs: lsblk -f shows filesystem UUIDs needed for /etc/fstab entries. More reliable than device names which can change.
lsblk vs fdisk: lsblk shows device info without root. fdisk -l shows partition tables but requires root. Use lsblk for viewing, fdisk for modifying.
Not all devices shown: lsblk shows block devices only. Network mounts (NFS), tmpfs, and other non-block filesystems are not shown. Use df for mount points.
Frequently Asked Questions
How do I see all disks and partitions?
Run lsblk to see the tree view, or lsblk -f to include filesystem types and mount points.
How do I find the UUID of a partition?
Use lsblk -f or blkid. UUIDs are needed for reliable /etc/fstab entries.
How do I check disk sizes?
lsblk -d shows only disk devices with sizes. lsblk shows all devices including partitions.
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