lsblk

Additional Notes

lsblk lists block devices such as disks, partitions, loop devices, and mapped devices. It shows how storage devices are arranged and where filesystems are mounted.

Use it before mounting, formatting, partitioning, or troubleshooting disks.

Syntax

lsblk [options] [device...]

Parameters

• options: Flags that change how lsblk behaves.
• device: Disk, partition, volume, or filesystem path to inspect or modify.
• target: Mount point, file, or storage object used by the operation.

Common Options

• -f, --fs: Show filesystem type, label, UUID, and mount point.
• -o LIST: Choose output columns.
• -p, --paths: Print full device paths.
• -a, --all: Show all devices.
• -d, --nodeps: Do not show child devices.
• -J, --json: Output JSON.
• -S, --scsi: Show SCSI device information.

Examples

lsblk

List block devices in a tree.

lsblk -f

Show filesystems, UUIDs, labels, and mount points.

lsblk -o NAME,SIZE,FSTYPE,MOUNTPOINT

Show selected columns.

lsblk -p

Show full device paths like /dev/sda1.

lsblk -J

Print JSON output for scripts.

Practical Notes

• Confirm the correct device before running mkfs, dd, or partitioning tools.
• MOUNTPOINT shows where a filesystem is attached.
• Use blkid for detailed filesystem identifiers.
• Use df -h for filesystem space usage after mounting.