Questions tagged [partition]

Creating a new disk formatting scheme or altering an existing scheme

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After stuck “Partitioning disk” by Boot Camp

I use a MacBook Pro Late 2011 with OS X El Capitan (10.11.4). I wanted to install Windows using Boot Camp Assistant. However, I got stuck at Partitioning disk.... It seems that it is a very common ...
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1k views

Creating a EFI partition

I have been having trouble installing OS X Mavericks and I think I found the problem. It told me I couldn't boot up with Macintosh HD, so I verified my disk and I got this error: This disk doesn't ...
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236 views

Trouble with my partitions

I have some trouble with my partitions on my Macbook Pro. I created 2 partitions. One named "Yo" where I have installed Yosemite release. Another one named "Save" where I put all the stuffs I need to ...
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2k views

Disk Utility not letting me partition my SSD or modify the current ones

Just yesterday I finally got my hands on a MacBook Pro in which I was planning to install Ubuntu and Windows aside from OS X for studying purposes. I was barely beginning by partitioning the disk, or ...
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2answers
1k views

Should I defrag my SSD before creating a partition for Boot Camp?

I have a 500GB SSD in my MacBook Pro. I have been using my laptop for over three years - and it was migrated using Migration Assistant from a previous laptop that I had been using for five years ...
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789 views

Can I repartition my primary hard drive without removing the Lion recovery partition?

Scenario: I boot into Recovery mode and open Disk Utility. Then I select the primary hard drive and choose 1 partition. Will that destroy the recovery partition as well?
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1answer
53 views

USB Sticks not getting properly recognized

Two of my USB sticks (Lexar and PNY, both 32 GB) are not getting recognized correctly by macOS Sierra. Both worked before (one formatted with NTFS, the other with FAT32); they were then used as ...
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1answer
4k views

Why did an “Untitled” partition appear that uses up half the disc space and how do I get rid of it?

On a Mac OS X Server, I realized today that the 1TB disk has all of the sudden two partitions, both of them around 500GB large: 1TB APPLE HDD ST1000LM024 Macintosh HD2: Mount Point: / ...
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1answer
232 views

My Fusion Drive Partitioning Seems Wrong/Strange/Wonky

See below for diskutil list of my 3TB fusion drive (iMac 27" late 2014) running High Sierra: I assume disk0 is the HD and disk1 is the SSD, and disk2 is the virtual combo that is mounted as my "HD". ...
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134 views

Create a partition that both Windows and macOS Sierra can access via Disk Utility

After I installed macOS Sierra I decided I wanted to also have Windows for gaming. I installed Windows 8.1 via Boot Camp Assistant and gave it about 110 GB of space. After some time I realized that ...
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1answer
3k views

Erase partition without recreating one?

I've got an external USB hdd that I wish to use entirely as a TrueCrypt volume. There was one pre-formatted partition, so I'm trying to erase that with Disk Utility. But no matter what I do or try, ...
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36 views

Crash during Boot Camp restoration. How do I remove my Windows partition?

As mentioned in the title, my OS crashed while removing the windows partition. Now Boot Camp Assistant doesn't recognize the pre-existing Windows partition anymore. See diskutil results below. How ...
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1answer
1k views

Does my Bootcamp partition, disappeared by Lion install, still exist?

I installed Lion on my macbook air, and noticed a couple of days later that my bootcamp partition was gone--rebooting with option key no longer showed the volume, and diskutil shows the following ...
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1answer
2k views

Cannot delete partition (minus greyed out) - non-encrypted, no core storage

When trying to install Windows 10 from scratch on my Late 2013 MacBook Pro, I was unable to remove the old BOOTCAMP partition through the Boot Camp Assistant. I erased the partition with Disk Utility,...
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1answer
2k views

Upgrade to Yosemite failed - MBR and GPT don't match?

Upgrading to Yosemite so I can install the newest version of xCode. Shortly after starting I get this error: I've tried going into Disk Utility and repairing permissions, but even though it says it's ...
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1answer
101 views

Is it faster to resize a Time Machine partition, or completely wipe it and back up again from scratch?

I have a ~500GB Time Machine partition I'd like to shrink slightly. My internal source partition is around 400GB. Resizing the partition would be extremely slow, since Disk Utility has to check all ...
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1answer
3k views

Cannot unmount disk0 resource busy

I am unable to wipe my hard drive and install new OS X as the resource is busy. I would imagine this is because I have Recovery open on this disk and that's why it is busy. I've tried: diskutil ...
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1answer
3k views

Cannot use Disk Utility to create partition from free space on external USB drive

I have a 3 TB Western Digital red disk in a USB hard drive dock. The drive is GPT, and I have two volumes on it (one volume is "Microsoft Reserved", other volume is NTFS). The other part of my drive ...
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1answer
395 views

Windows 10 partition disappeared after resizing

My Windows partition disappeared after resizing it. I found a post on NERDr with a walkthrough for how to fix it and I did everything. This is what I got in my terminal: Enter an MBR hex code (...
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1answer
110 views

Can I safely remove a broken recovery partition?

Can I remove the broken recovery partition? $ diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme ...
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180 views

Disk format for HDD with both APFS and HFS+ volumes

For a HDD which will have both HFS+ and APFS volumes, is it better to format the disk itself in Disk Utility (on High Sierra) as APFS or HFS+?
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1answer
7k views

Cannot format SSD to OS X Extended (Journaled) in order to restore

yesterday my computer stayed awake during all night, when I woke up it stopped working. I got many errors, one that says for example that I don't have enough space in my computer even though that when ...
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1answer
109 views

Need to partition free space after clone on mbp

I cloned my MacBook Pro 1 TB SSD to a 2 TB SSD. The new SSD shows up just like the old one. How do I add the unallocated free space (~1 TB) on the new SSD to the main volume? technicgal1:~ ...
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1answer
2k views

Crashed when creating a partition - now missing drive space!

Just a couple of hours ago, while I was taking a GNU course, I decided to create a partition on my SSD to have ubuntu installed, meanwhile the disk utility was doing that, suddenly it just crashed and ...
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3answers
2k views

Clear free space in Disk Utility

So I recently removed Windows 7 from my iMac, but Bootcamp didn't let me do it. I used Disk Utility instead. The old Windows 7 partition now shows up as free space. I want to reinstall Windows 7 again ...
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3answers
10k views

How to repair Mac partitions without Internet Recovery and Rescue USB?

Resizing the C:\ drive under Windows(bootcamp) corrupted mac partitions. Neither Mac OS X nor Windows are able to boot. Holding the Option(ALT) key shows only Windows, which can't boot. Internet ...
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2answers
2k views

Unable to install Windows 8.1 using Bootcamp, system volume doesn't contain required free space?

I'm unable to install Windows 8.1 using Bootcamp on my 2015 MacBook Air. The installer says setup was unable to use the existing partition because the system volumes doesn't contain the required free ...
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1answer
508 views

Partition showing as 'FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFF'; attempted to fix it but made it worse

MacBook Pro 2015. I recently dual-booted my Mac with Linux for school however I changed my mind on which distro to run and figured the best way to change would be to format and remove the Linux ...
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1answer
602 views

Failed attempt to fix macOS partition startup volume set to FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF

I attempted to fix an issue I encountered yesterday my MacBook Pro (13-inch, Mid 2012) following instructions in the top answer of this thread. I'm afraid I may have inadvertently destroyed my data by ...
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4answers
19k views

How to partition an SSD that fails with error 69888 - couldn't unmount disk?

I erased the SSD drive in my MacBook and was reinstalling Lion when it failed about 75% through the install. Now in Disk Utility, sometimes I see the SSD drive and sometimes I boot and it's not there ...
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2answers
3k views

Cannot partition w/ Boot Camp Assistant on macOS Mojave

Late 2016 Macbook Pro running Mojave 10.14.3, APFS-formatted (ugh). I have run Disk Utility to verify my disk, and I've run fsck -fy from single-user mode several times. Both of these have reported ...
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1answer
6k views

What does “EFI system partition couldn't be created” mean?

When trying to click "Repair Disk" on an external hard drive from Disk Utility, I got the following error message: ... Repairing the EFI system partition's file system Updating boot support ...
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73 views

delete admin partition [duplicate]

I’m new to MacOS world. By accident I deleted the admin partition (Directory). Every time when I want to install a programme, the system ask me for the admin login. I enter the login but it is not ...
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712 views

Partition alert message when using Boot Camp Assistant: “The startup disk cannot be partitioned or restored to a single partition.”

I have a 13" Early-2015 MBP Retina in which I am trying to install Windows 8.1 on. When I went into bootcamp, I received the ever so common error of: When I went to the newly designed disk utility, ...
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1answer
64 views

How to automat the selection of usb disk based on size

I am trying to automate a process where teachers delete content on memory sticks with different name then put the right content back (same each time) and rename the memory stick to UDISK. I want to ...
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30 views

I am trying to clone a 2TB drive that has mac os x 10.6.8 onto a smaller drive but dont know what I am doing

I have a Mac Pro that I cant install an OS onto at the moment because I do not have snow leopard. I do have a bootable 2TB Western Digital drive that comes from an identical Mac Pro that has 10.6.8 ...
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552 views

Can't extend APFS after erasing old partition as free space [duplicate]

My problem is very similar to this one: Extend main APFS partition fails with "target disk is too small for this operation" I erased an unused 80 GB partition as free space, and I would ...
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1answer
2k views

WD external drive won't mount in OSX - partition map rebuild?

I have a WD Mybook Studio 500gb that will not mount. I've tried every possible option in Disk Utility and it see the drive (unlike finder), but won't mount the partition. I also tried plugging it in ...
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58 views

MacBook wont boot after creating two small partitions

I recently created 2 small partitions, and after that, I shutdown my Mac. Then when I turned Mac back on today it took awhile to boot and then showed a blocked symbol. I tried booting into the ...
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2k views

Can I delete the Apple_KernelCoreDump partition in High Sierra?

In MacOS High Sierra's Disk Utility, the partition is listed as Kernel Core Dump Storage (655MB). Its type is Apple_KernelCoreDump in the result of diskutil list. There is also a description, "You can ...
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3answers
3k views

How to create third partition on a Mac with Mavericks and Bootcamp? [duplicate]

Right now I am running OS X 10.6.8 (Snow Leopard) on my MacBook Pro, with Windows 7 via Boot Camp, and I also have a third FAT32 partition where I share data between Mac/Windows. I am going to ...
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1answer
420 views

How Do I Recover Formatted Mac hfs+ Partition?

I was installing Win8 on a Mac where I got the error that I can because of GPT disk I dont know what MAC I have but the Mainboard is number is Apple Mac 942859f58194171B. I tried formatting the ...
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338 views

How to fix partitions if disk utility is not able to?

I ask my question regardless of how I came to this point to make it more generally usable. Disk utility is not able to fix my partitions. First partition is OS X (runs fine), second one is Windows (...
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1answer
279 views

Restore partition type to NTFS

I have a usb disk with two different partitions, one for TimeMachine and the other for storage formatted as NTFS. This morning i was looking for a way to mount in r/w mode the NTFS partion (macfuse ...
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779 views

How to recover lost partition after diskutil erasevolume noformat

I previously had 2 partitions on my 1TB hard drive... - Partition 1 (disk0s4): Macintosh HD (which had OS-X and all my data) - Partition 2 (disk0s2): Apple HD (which was a back-up partition) I erased ...
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MacBook Pro disk utility - disk0s2 not mounted

I am trying to erase all data from my laptop and reinstall OS X before I trade in. I erased all data on Macintosh HD but now when I go to reinstall OS X there is no hard drive appearing when prompted ...
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9k views

Disk Utility “First Aid” says “Problems were found with the partition map which might prevent booting” after clean install

My Mac Mini (Mac Mini 3,1 at OS 10.11.6) shows this after a "successful" run of First Aid from Disk Utility on the internal HD (i.e. not just the main volume, the entire HD) "Problems were found with ...
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1answer
1k views

Bootcamp issue: The startup disk cannot be partitioned or restored to a single partition

I tried installing windows 10 on mac but some sort of error occured and since then boot camp had been removing the partitions for hours. So I ran "diskutil eraseVolume fat32 BOOTCAMP disk0s3" on ...
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2answers
4k views

How do I repartition my Mac to get rid of my dual boot setup?

I setup dual boot on my Mac (with Ubuntu) and want to get rid of it. The Disk Util GUI shows me: However attempting to remove the disk0s4 or disk0s5 partitions results in: Could not unmount ...
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114 views

Replace Recovery HD with a “bootable drive” formatted partition?

A while ago, I had the idea to use the bootable Mac OS X USB drive-making procedure on a hard drive partition, so that I could basically have a version of the “Recovery HD” that doesn’t need to ...