BO Central Management Console export reports to a network folder problem

Hi,

I am trying to have a scheduled report in the CMC export in xls format to a shared folder.

I receive the following error message when the report fails

I looked up the crystalenterprise.diskunmanged issue and was informed to

go the job server and to enable unmanaged disk

but do not see UNMANAGED DISK as an option.

How do i get that option added back in?

Do I need to reinstall the entire CMC?

Will I lose my reports and history in the console if this is done?

Thank you,

Sharon