On El Capitan - Can I split a partition in two?

krs


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I have a large 8 TB external hooked up to my Mini.

When I initially formatted it, I made a few 1 and 2 TB partitions to use as backups.

Three of these partitions have a fair amount of data on them; there are still a few of these 1 TB partitions that have no data, just the formatting.

If possible, I would now like to split one of these "empty" 1 TB partitions into two 500 GB partitions.

I keep reading that this is possible without affecting the other partitions - especially the ones with data, but when I go to Disk Utility there doesn't seem to be an option to create two 500 GB partitions from one 1 TB partition.

So...can that actually be done?
Can I do it with Disk Utility?
And where do I start? When I select the partition I want to split into two, the partition icon is greyed out.
 

Rod


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Your Mac's Specs
2021 M1 MacBook Pro 14" macOS 14.4.1, Mid 2010MacBook 13" iPhone 13 Pro max, iPad 6, Apple Watch SE.
In answer to your questions: If the partitions were formatted as a GUID partition map yes and if not no.


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krs

krs


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Thanks,
Yes, the partitions are formatted as GUID, at least it says so when I select the whole external (and GUID is what I selected when I did the original partitioning)
But if I select just one of the partitions and check Info it says file system OS X Extended and the File system UUID with a hex number next to it

I read the MacWorld article - I get to the part where it says:
In the new Disk Utility, you drag a handle around a circle and click the + button to add new partitions.
OK - sounds good.
Then in the article it shows the circle where one can change the size or add new partitions, but how do I get to that circle?
I must have clicked on every option I see in disk utility, none give me that window that is shown in the article.

PS: I feel really stupid posting this - I'm sure I have seen the circle before when I was poking around on my Mac, but now can't get to it for love nor money.
 
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If you look in the image, it shows the "disk/drive" as being selected, not the partition you want to adjust. After you're there, you should be able to select the disk partition you want to partition.
 

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