Time Machine - problem of reformatting drive


I recently started to use a new external drive for Time Machine with encryption. I want to encrypt another drive that I used for Time Machine for several years without encryption. So, I went to Disk Utilities etc and reformat the drive. Everything seemed to go well, except that when I open the time Machine (and he does this thing 'Dr Who' from the 1970s!), it seems to be 'remember' some previous backups, even if she won't let me access it. Surely, the reader could not have been formatted properly.

I advice in public services, watch the disc has two 'levels', both of the same name--as if 'a folder in a folder '. I guess that this concerns the drive with a partition, but I'm not sure. The "bottom" element can be reformatted, but cannot be the top element. I want to delete all of the disk and start over. Please can anyone advise me on what to do / what am I doing wrong?

Related to this: I noticed that the disk can be encrypted in the disc utilities when formatting, even though I had ignored that and it costed in Time Machine instead. Does make a difference?

Thank you!

While in Time Machine, to see all the volumes mounted shift - command - c.    Information derived from Linc Davis.

What happens when you select the drive at the top of the page?

Tags: Mac OS & System Software

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