Issues adding partitions to an external HDD

I have Mavericks on my '08 macbook . I bought a new Toshiba 1TB HDD, and when I researched online I was under the impression that I can add partitions to an HDD without losing any information on the disk.

I opened Disk Utility and Formatted the HDD to 400GB and 600GB partition as Mac OS Extended Journaled . I launched Time Machine and I backed my macbook to the 400GB partition and encrypted it. It worked.

Now I want to add a 3rd partition to the HDD but that does not seem to be possible , as the (+) button in the "Partitions" tab in Disk Utility is not highlighted and is NOT selectable . If I selected the unused 600GB partition , I can only chose to take that partition out but I can not add any more to it.

Can some one help?

 

Thanks for caring to give help.



As you see, the area that says "Untitled" is where I want to add extra partitions but Disk Utility will not allow me to do that. I can not add partitions or resize. Do you think I should format that part into another kind of partition like MS-DOS FAT ExFat ?

 

I am running Mavericks , When I inserted my HDD for the first time my Time Machine asked if I wanted to use it I said no. I partitioned the drive (400GB, 600GB) , ejected and remounted and when it asked me again I said yes and chose to encrypt the 400GB.

I am not sure what is a sparse bundle is , and there is no encryption ticks in my Time Machine in the Preference Pane , at least where I looked.

So, now to fix this I need to turn encryption OFF on the 400GB part , add partitions, then re-encrypt my backup volume?

I learned there is an "Encryption OFF" in the Disk Utility menus , but I heard it doesn't work right.

Thanks for your help everyone

 

ok thanks this helped a lot.

I think I will just reformat that HDD into as many partitions as I want then , re-backup and re-encrypt. Last time it took something like 6hrs for 220GB or so, I hope this does not take a toll on the HDD.