How to remove partition in Mac, when Disk Utility procedure fails?

Question

MacBook Air 13インチ Mid 2012

1.8 GHz デュアルコア Intel Core i5（Turbo Boost使用時最大2.8 GHz）3MB L3キャッシュ

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michaeljwilliams51 @michaeljwil4088

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投稿日: 2016年6月22日

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How to remove partition in Mac, when Disk Utility procedure fails?

Context:

MacBook Air (mid 2012), OS X El Captain version 10.11

256GB SSD split into a 30GB partition (OS X el capitan, name is "Macintosh HD") and a 50GB partition (used to be BootCamp, name is now "B"). The 25GB partition needs to go. I have erased the 25GB to an OS X extended (Journaled) partition, but when I click on partition, I still cannot remove it (the infamous "minus greyed out", see image).

I can resize it, but Macintosh HD stays at 35GB, and a third partition is made which in turn can be removed, but the space it liberated is allocated to B again, which doesn't solve anything. Please tell me how I can solve this problem?

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Do you have access to another Mac so you can use Target Mode?

mayer さんによる2016年6月28日

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Do you have access to another Mac so you can use Target Mode? — mayer

Douglas Gordon @douglasgordon 評価: 109 3 · Answer 1 · 2016-06-27T20:18:56-07:00

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Douglas Gordon @douglasgordon

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投稿日: 2016年6月27日

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Before you go in the terminal way, you must take the complete data backup of your Mac since a single wrong command line will invite new trouble and your complete Macintosh hard drive can now be unrecognized. Other way round will be using a partition manager utility by creating a bootable USB and then resizing / creating / deleting partitions. You may look at below mentioned apps partitioning your Mac:

1) Stellar Partition Manager

2) iPartiton

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MacBook Air 13インチ Mid 2012

How to remove partition in Mac, when Disk Utility procedure fails?

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