How to fix the error ORA-00206: error in writing (block string, # blocks string) of control file?

In this post, you’ll learn more about the Oracle ErrorORA-00206: error in writing (block string, # blocks string) of control file with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-00206: error in writing (block string, # blocks string) of control file

Reason for the Error ORA-00206: error in writing (block string, # blocks string) of control file

A disk I/O failure was detected on writing the control file.

How to fix the Error ORA-00206: error in writing (block string, # blocks string) of control file ?

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

Check if the disk is online, if it is not, bring it online and try a warm start again. If it is online, then you need to recover the disk.