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REZISE ROOT (/) PARTITION LINUX WITHOUT VOLUME GROUP WITH CFDISK
REZISE ROOT (/) PARTITION LINUX WITHOUT VOLUME GROUP WITH CFDISK
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May 20, 2026
11:35 am

Resize Root (/) Partition on Linux Without Volume Group Using cfdisk

Overview

This process is used when your Linux system does not use LVM (Logical Volume Manager) and you want to enlarge the root (/) partition by using free unallocated disk space.

The example in the illustration uses:

  • Disk: /dev/sda
  • Root partition: /dev/sda2
  • Tool: cfdisk

Step-by-Step Explanation

1. Check Current Disk Layout

Before resizing, check the partition structure:

lsblk -f

Example:

NAME   FSTYPE SIZE MOUNTPOINT
sda           100G
├─sda1 ext4     1G /boot
└─sda2 ext4    20G /

This shows:

  • /dev/sda1 → boot partition
  • /dev/sda2 → root partition (/)
  • Remaining disk space is unallocated

2. Boot Using a Live USB

You cannot resize the root partition while it is mounted and actively used.

Boot the system using:

  • Ubuntu Live USB
  • Debian Live USB
  • Any Linux live environment

Choose:

Try Ubuntu

or similar live mode.

3. Open cfdisk

Run:

sudo cfdisk /dev/sda

You will see the partition table and free space.

4. Delete and Recreate the Root Partition

In cfdisk:

  1. Select /dev/sda2
  2. Press Delete
  3. Select Free Space
  4. Press New
  5. Create a new partition using all remaining free space
  6. Make sure:
    • Start sector is exactly the same as before
    • Type remains Linux filesystem
  7. Press Write
  8. Type:
yes
  1. Quit cfdisk

Important:
As long as the starting sector stays the same, your data is usually preserved.

5. Reboot the System

Restart normally into your installed Linux system.

6. Resize the Filesystem

After the partition becomes larger, expand the filesystem:

For EXT4:

sudo resize2fs /dev/sda2

For XFS:

sudo xfs_growfs /

7. Verify the Result

Check the new size:

df -h

Example output:

Filesystem      Size  Used Avail Use% Mounted on
/dev/sda2        97G   11G   81G  12% /

Now the root partition successfully uses the additional space.

Important Notes

⚠️ Always backup important data before resizing partitions.

⚠️ Make sure you select the correct disk (/dev/sda).

⚠️ If the start sector changes accidentally, the filesystem may become corrupted.

⚠️ This method is intended for non-LVM Linux systems only.

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