Mac command line delete partition

Apparently, the disk manufacturers and Windows have a different understanding of what a "gigabyte" is. Also, if you have several disks of the same size attached, it may get even more confusing. If in doubt, better unplug all external drives except for the one you actually want to work with, to make sure you are not accidentally erasing data on a wrong disk!

In our case, the 60 GB disk shown as Although these two partitions looks similar, they are treated very differently by Windows. If you right-click on the normal NTFS partition, you should see the normal menu that lets you perform various tasks on that partition, including the Delete Volume command:. As you can see, the partition is protected in such a way that even the powerful Disk Management tool cannot do anything to it. Note that it's not because the partition is EFI, it's because the tool that created that partition had marked it in a way that prohibits other tools to tamper with it.

That's usually the case for the system hard disks formatted on the Mac computers. However, what if we want to delete such a partition and re-initialize the disk from scratch? We can do that by clicking the Start button and entering cmd in the search box:. Make sure that cmd is highlighted on the menu above, but do not press the Enter key yet!

Instead, press the Ctrl and Shift keys together, and while keeping them depressed, press Enter. The first command we should use is list disk that should display the list of the disks currently connected to the computer:. Again, it's very important to properly identify the disk we want to work with in the list. Once we are sure that this is the disk we want to re-initialize, we need to select it, by entering the command select disk 4 yes, that's how selection is usually done when using the command line tools! Then, let's use the list disk command again, to confirm that the disk in question is indeed now selected:.

The command that does that is clean. Note that this command erases everything on the selected disk, all partitions, protected or not. If you still have files on other partitions of disk 4 that you want to keep, you should exit now and backup those files, because after using the clean command all such files will be erased without a trace! After the clean command is done it should take no more than a few seconds , we get a fresh disk with all partitions erased.

When it starts, it automatically detects the presence of the clean disk and prompts us to initialize it:. Press OK and the newly cleaned disk will appear in the list. The difference is, the protected EFI partition is gone!

The normal NTFS partition that used to be on the disk 4, is gone, too. The disk is now ready for you to start creating partitions, formatting them, and do other things as needed:. Note that if you are trying to erase the system disk that hosts the C: drive where Windows itself is installed and running, then even the powerful DISKPART command can't work: Windows simply refuses to erase the drive from which it is running.

The Basics of the Recovery Partition

To erase such a disk, you need to physically remove it from the computer, attach it to another computer as an external drive, and then use DISKPART on that computer to erase the disk. Thank you for this, took me hours tearing out what little hair I have left getting nowhere. Worked a treat — and makes me think I really should learn a bit more dos.. Didnt even know it existed, so easy and so logic to use..

You have saved my bacon. Brilliant, informative and helped me out. Look forward to using other tutorials you have.

HOW TO: Delete a partition on Mac

Thought this might be helpful. Unfortunately it sees the USB drive has failed. But thank you for this detailed and easy to follow write up.

Disk Utility Tool (Mac OS X )

Well done. Ben Stockton is a freelance technology writer based in the United Kingdom. In a past life, Ben was a college lecturer in the UK, training teens and adults.

macos - How do I remove unused partition (El Capitan)? - Ask Different

Since leaving the classroom, Ben has taken his teaching experience and applied it to writing tech how-to guides and tutorials, specialising in Linux, Windows, and Android. He has a degree in History and a postgraduate qualification in Computing. Read Ben's Full Bio. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition.

Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode. Windows 10 Suddenly Extremely Slow! How to Fix. Let it manage your storage drive: resize, format, delete, clone, convert, etc. Download Center Partners Support.

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Fast, complete and safe hard drive data recovery software to recover your data in easy steps. Partition Master Pro. All-in-one partition manager software can safely and simply resize partitions for PC. Professional server partition software for Windows Server system. Todo Backup Workstation. Small business backup solution to protect your PC, laptop or workstation from disaster. Windows server, exchange and SQL Server backup solution to ensure business continuity.

Need easy iPhone data transfer software? Disk Copy Pro. Step 2. Type diskpart and hit enter. Step 4.

Type select disk G and hit enter. Step 6. Type select partition 0 and hit enter.

Step 7. Type delete partition and hit enter.