_disable_logging=true and ORA-00353 question

**important _disable_logging is an advanced parameter and you should not be set**
Hi please,
 in my test of upgrades I was using _disable_logging, to understand how it works.
I had to do an upgrade from 9.2 to 9.2.0.4 to 10.2.

I'm not thinking in use on production. I only want to understand it.

I enabled it in the upgrade process and disable after the next upgrade step. Every thing was ok.
Finally once migrated having _disable_logging=false I run a long script which run correctly and at the end of the script, I suppose in the moment of a logswitch, I got the following error:

ORA-00354: corrupt redo log block header
ORA-00353: log corruption near block 2 change 105990334 time 05/11/2006 09:06:19
ORA-00312: online log 2 thread 1: 'E:\ORASERP\LOGFILES\LOG_2SERP.ORA'
ORA-00312: online log 2 thread 1: 'D:\ORASERP\LOGFILES\LOG_2SERP.ORA'

I tried an ALTER DATABASE CLEAR UNARCHIVED LOGFILE
'E:\ORASERP\LOGFILES\LOG_2SERP.ORA'; and I received a message the file
don't exists

Why does it happen?
I suppose if I would had done an ALTER SYSTEM SWITCH LOGFILE; or an ALTER DATABASE CLEAR UNARCHIVED LOGFILE
'E:\ORASERP\LOGFILES\LOG_2SERP.ORA';

In some moment, this problem wouldn't had happen.

But I can't get it, why if everything was ok, in the moment of switch it get an error log corrupt.

Thank you :)

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