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macrumors regular
Original poster
Sep 19, 2012
l have created 2 partitions in disk utility for my 1TB USB HD, I chose ExFAT and other partition MAC OS Extended (Journaled) but l want this partition to be encrypted. how do l do that? because the option isnt even there
(pls see attachment) l tried to right click the MAC OS Extended (Journaled) partition in the Finder window, and chose encrypt thinking that would do it, but then a window saying "A GUID Partition Table GPT partitioning scheme is required." appears. how do l create this 2 partition, one EX FAT other MAC OS Extended (Journaled) encrypted external USB drive?


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macrumors 68040
Feb 10, 2008
Dunno, but I typically create an encrypted disk image when I only want part of a drive encrypted. At the top of the disk utility window is a create new image and options to encrypt the image is there. The image will be mountable just as if it was a physical drive.

Otherwise I think you click (highlight) the volume under the disk (UNTITLED I'm guessing) and when you select erase it may give you an encrypted option for the format.
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macrumors G4
Jul 17, 2002
I think that ColdCase is correct. You are trying to format the media rather than the partition. Follow his advice and select the partition in the sidebar.


macrumors 65816
Jan 23, 2010
San Diego, CA USA
Select the drive in Disk Utility.
Select the "Partition" tab.
Change the "Partition Layout" selector to 2 partitions.
Click on the "Options..." button on that tab.
When it gives you a list of options to select, select the "GUID Partition Table" option.

Then partition the drive with the sizes you want. Keep in mind that once you partition the drive using GPT then you will need Windows 7 or higher to read the drive.


macrumors regular
Original poster
Sep 19, 2012
thanks mfram, ok l erased the main buffalo drive (top of the 2) and chose Mac OS Extended (Journaled, Encrypted), l have added the attachments, in format5, description of problem is can only add partition by clicking "+" at bottom, "options" unclickable, and size cant be adjusted. please help me get this sorted, thanks so much


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  • format6 prob, same probs as 5..png
    format6 prob, same probs as 5..png
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macrumors 601
Dec 13, 2004
I tried this once and it didn't work. HFS and HFS encrypted partitions on the same drive worked though.
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