When I try to set up Time Machine, there are no back up disks displayed.  Therefore, I cannot turn on Time Machine.  How can I fix this?

When I try to set up Time Machine, there are no back up disks displayed.  Therefore, I cannot turn on Time Machine.  How can I fix this?

Thanks - let it finish, but zero out data is unnecessary. That option is intended to thoroughly erase previously recorded data so that it cannot be recovered without sophisticated data recovery techniques.
Case sensitive is OK but I suggest you simply select Mac OS X Extended since "case sensitive" may complicate things for you in the future, should it be necessary to restore files to a case-ignorant volume.
Once it finishes, make sure it appears as a selectable option in Time Machine. If it does your problems are solved, but consider using Disk Utility and reformatting it. This time don't worry about zeroing unused space, and select Mac OS X Extended (Journaled). It will only take a few seconds this time.
For a more thorough description read Apple Support Communites contributor Pondini's FAQ: http://pondini.org/TM/5.html Read the pink box regarding the subject of case sensitivity.
Also: Mac Basics: Time Machine

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