How to fix the Oracle error ORA-15026: disk ‘string’ is not an ASM disk?

In this post, you’ll learn more about the Oracle ErrorORA-15026: disk ‘string’ is not an ASM disk with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-15026: disk ‘string’ is not an ASM disk

Reason for the Error ORA-15026: disk ‘string’ is not an ASM disk

The disk did not contain a valid ASM disk header.

How to fix the Error ORA-15026: disk ‘string’ is not an ASM disk ?

You can fix this error in Oracle by following the below steps

Check to see if the data on the disk has been changed by some system administrator action.