How to Fix: Resizing a partition in Linux - Bad magic number in super-block error

The 'Bad magic number in super-block' error occurs when trying to resize an ext4 partition in Linux using parted and resize2fs. This issue affects users who attempt to resize their partitions without proper precautions, leading to data loss or corruption.

Resizing a partition can be a frustrating experience for many Linux users, especially when dealing with errors like the 'Bad magic number in super-block' error. In this guide, we will walk you through two methods to safely resize your ext4 partition and avoid data loss.

🛑 Root Causes of the Error

• The primary reason for this error is that parted's `mkpart` command does not properly handle large file systems when resizing. When the `mkpart` command tries to create a new partition, it may overwrite or corrupt the existing superblock, resulting in a 'Bad magic number' error.
• Another possible cause of this error is that the existing partition table on your disk has become corrupted or damaged, leading to an invalid superblock. In some cases, this can be due to improper shutdowns, power failures, or other hardware-related issues.

🔧 Proven Troubleshooting Steps

✨ Wrapping Up

To safely resize an ext4 partition in Linux without data loss, use one of the two methods outlined above. By following these steps and taking necessary precautions, you can avoid the 'Bad magic number in super-block' error and ensure a successful partition resize.