Internal drive partition does not appear in Disk Utility

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Level 1

20 points

Internal drive partition does not appear in Disk Utility

The internal drive in my Mac Mini has 2 partitions, A and B. I would like to modify one of the partitions, but it does not appear in Disk Utility when I select the Hitachi drive.

(When I select Macintosh HD, the partition option is grayed out but info says there are 2 partitions.)

I want to delete contents of partition A and use it for something else. It is assigned to another user, user A. Is that why I can't see it? I am user B and the superuser. I can log in as user A as well.

How can I change partition A through Disk Utility? Should I change ownership of partition A to user B?

Mac mini, macOS 10.12

Posted on Jun 2, 2020 1:59 PM

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Answer 1

crabpaws Author

Level 1

20 points

Jun 3, 2020 11:08 AM in response to BDAqua

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *320.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 319.2 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

/dev/disk1 (external, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *2.0 TB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_CoreStorage Seagate Backup Plus ... 2.0 TB disk1s2

3: Apple_Boot Boot OS X 134.2 MB disk1s3

/dev/disk2 (external, virtual):

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Seagate Backup Plus... +2.0 TB disk2

Logical Volume on disk1s2

BDAD1FA9-F1F8-4147-A523-2D82595A1864

Unlocked Encrypted

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Answer 2

HWTech

Level 9

60,758 points

Jun 6, 2020 3:47 PM in response to crabpaws

Your internal boot drive looks like a standard configuration with no extra partitions (outside of the standard Apple setup).

Your external Seagate drive appears to have just one encrypted partition for your TM Backup (actually there is a very small secondary partition for making it bootable).

Neither drive has any extra or spare partitions for you to use.

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