Apple's built-in disk management utility for the mac. Erases, formats, and restores volumes and drives.

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2
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1answer
521 views

Messed up 1TB Fusion Drive Partitions (on iMac 5K)

Alright, so I did something stupid today, and I really need some help right now… So kinda like the situation in this post I think I messed up the Fusion Drive on my 1TB iMac (with BootCamp), I messed ...
0
votes
1answer
57 views

Did something wrong with partitioning my SSD

I tried to make a partition for Windows on my Mac by using Apple's Disk Utility, because bootcamp already showed me that it didn't work for some reason. But now I'm stuck with a 70 gb hard disk, and ...
0
votes
0answers
21 views

Can not create an additional shared FAT partition for my bootcamp

I created a Boot Camp partition, and everything is working fine, but then I wanted to add a shared partition (FAT), so I can exchange files between my OS X and Windows bootcamp, but it says I only ...
0
votes
0answers
618 views

Apple Hardware Test result: 4HDD/11/40000000: SATA(0,0). But repaired Disk and Permissions w/o a problem

Ran an Apple Hardware Test. Result: 4HDD/11/40000000: SATA(0,0). Then repaired Disk and Permissions. Result: Volume appears to be okay. But during use, sometimes it freezes randomly and my MBP ...
0
votes
1answer
91 views

EFI automounts on startup

After upgrading to the newest El Capitan from 10.10. to 10.11.1 - I guess - the normally invisible EFI partition appears on the desktop as a regular volume on different machines, if I choose to show ...
0
votes
1answer
46 views

Time Machine offers to erase disk data (format), will it delete all my partitions?

So, I'm trying to perform my Macbook backup on my 3TB drive. This drive is currently has a GPT table with 4 partitions: BackupMain BackupKubuntu BackupWindows BackupMac Before BackupMain, there ...
0
votes
0answers
108 views

Fix hard disk not detected after force eject

I got an HDD on my Mid 2012 Macbook Pro 13 inch. I decided to upgrade to SSD and I want a clean install of El Capitan. After the SSD ugprade and OS installation I connect my old HDD as an external ...
4
votes
3answers
3k views

Remove disk image from the disk list

In Disk Utility I see two disk images (Flash Updates) But I cannot find where the image file could be. On the console with diskutil I see /dev/disk2 (disk image): #: TYPE ...
0
votes
1answer
99 views

MacBook Pro 2011 keeps booting the OS X Utilities and won't accept our Apple ID

Before the issue became my headache, one of our relatives created a partition on my MBP to keep their files. Yesterday they deleted their partition and there might be important files that was delete ...
1
vote
2answers
176 views

How to create an ISO from a file (not a directory)

I'm trying to perform some testing on old platforms. In this case, its Fedora 1 (circa 2002 or 2003). The VM software (VMware and VirtualBox) can't handle distros that old, so the guests don't have a ...
0
votes
0answers
133 views

Is there any way to add a NTFS option in the format list of Disk Utility in OS X EI Captian?

There are two partitions on my drive, one for time machine, one for storing files which are exFat format. I would like to get one minimal thing to support NTFS, I would like to create a filesystem ...
1
vote
2answers
554 views

Yosemite cannot detect SD card

I know their is a flood of these questions but I have a late 2013 macbook pro with yosemite 10.10.5 installed on it. My problem is it won't read some of my SD cards, i've run disk util with the pny ...
0
votes
0answers
33 views

Partition problems - No LVG detected in Terminal after BootCamp Erase through Disk Utility (I know, I messed up)

I'm very stuck trying to get my system to recognize a full HDD and run Yosemite cleanly after a poorly-executed BootCamp removal. Here's the steps in the process so far: I erased a Windows Partition ...
1
vote
0answers
74 views

Disks not mounting (10.10.5)

Having an issue where multiple drives (External HD's via USB and an SD card inserted directly) will no longer mount when plugged in. If I open Disk Utility I can see the drive listed but the volume it ...
0
votes
0answers
146 views

What is the purpose of Apple_CoreStorage container on single drive Macs?

I had OS X 10.10. Output of diskutil list was something like this: Upgraded to 10.11. Output of the same command right after: I managed to get it to the previous state by enabling FileVault and ...
1
vote
1answer
44 views

Samsung SSD 830 disappears

A Samsung SSD 830 installed on a MacBookPro 2011 with Mavericks 9.5 was chugging along nicely until a file save action generated the coloured beachball ... and nothing else was active. I initially ...
0
votes
1answer
51 views

Is RAID1 volume usable while rebuilding RAID after disk failure?

One disk of my 2-disk-RAID1-stack has failed and I'm about to replace it. Is the volume usable—i.e. can I read & write just as I normally could—while Disk Utility is rebuilding the RAID?
3
votes
1answer
526 views

Reformat exFat with specific Device Block Size and Cluster Size

I have an 512 GB SSD on my MacBook Retina with one of the volumes disks0s6 formatted with exFat to use it on both Mac and Windows. diskutil info disk0s6: Device Identifier: disk0s6 ...
0
votes
0answers
69 views

Cannot delete Free Space on iMac 5K after I deleted Boot Camp partition with Disk Utility

I had Windows 10 installed via Boot Camp, and everything was running smoothly, except I did not think ahead when I had made the partition initially. So as I was using Windows more, I eventually ran ...
1
vote
0answers
66 views

Install rEFInd on separate partition (Errors)

I am trying to install rEFInd a separate partition but have run into an error. I'm doing this because I want to install Ubuntu on my other partition (separate from my Mac and and rEFInd partition). ...
1
vote
0answers
12 views

Recovering a partition on a flash disk

The other day my 128gb flash stick refused to be recognised when I plugged it in, giving me a 'failed to initialize' error with options to format it or eject. This was particularly frustrating because ...
1
vote
0answers
23 views

How to add addional HFS+ partitions after installing Windows with Bootcamp

The goal is to create a few extra HFS+ partitions after running the Bootcamp utility while not breaking Bootcamp's boot-ability. I am Running OS X El Capitain, and I only have a single disk drive to ...
0
votes
1answer
164 views

Fusion Drive with missing partition

Initially my Fusion drive (1TB data disk + 240 GB SSD) consisted of a single partition where it was installed El Capitan, then I split the fusion drive into two partitions, the second partition I ...
0
votes
2answers
368 views

Boot from USB in macbook pro mid 2012

I have removed everything from my macbook pro. Now, how can choose USB as a startup disk? I tried using option "SHIFT" keys also cmd+R. Nothing is working. How can I solve it? I am using Mid 2012 ...
0
votes
1answer
1k views

Cannot install OS X in recovery mode

I want to reset my iMac (late 2014, 1 TB Fusion Drive) to factory settings. As I want to set it back to Yosemite, I am using Internet Recovery (Command-Option-R) as I have installed El Capitan in the ...
0
votes
0answers
55 views

External disc partitioning gone wrong

I would appreciate any help as this situation is beyond my skills. I was trying to follow an internet instruction for putting an OS X Installation on my WD external drive using my MacBook, to ...
0
votes
0answers
125 views

What are the advantages or disadvantages to Logical Volume Groups vs traditional partitions

I recently installed a new 3TB hard drive on a Mac Pro (3,1) running yosemite. With other hard disks, I had previously installed the hard disk and then erased in disk utility getting the traditional ...
0
votes
0answers
27 views

Restore RAID Mirror?

I had a 3TB mirror using Apple software RAID on Mavericks—the two disks are in a USB3 JBOD and the USB3 card in my Mac Pro only works with Mavericks or older. Last night I demoted one of the disks so ...
1
vote
2answers
120 views

Disk Utility stuck at exit code 0 during partition restore (in Recovery Mode)

I have an iMac running OS X El Capitan. I tried to use the disk utility in normal boot to restore two partitions into one but it would exit with an error (exit code 8) and delete the second ...
0
votes
0answers
57 views

Scripting a Partition Scheme for CoreStorage - Mac

I've read a lot of information about the CoreStorage/Fusion Drive setup. In our environment, we work on a multitude of configurations of Macs, many with multiple operating systems on them. As such, ...
1
vote
1answer
166 views

Boot Camp failed and reduced Macintosh HD partition from 3TB to 1,46TB

What went wrong? I created a new partition with Boot Camp Assistant (OS X 2,25TB | WIN 850GB), but during the partition process, the iMac suddenly restarted. When it got back on the Fusion Drive's ...
2
votes
1answer
161 views

Help partitioning “free space” with utility disk

I've been trying to partition my harddrive to have ~50 gb of unallocated space (right now there's one partition with the operating system on it, so I would like to have that plus the free space). This ...
0
votes
1answer
53 views

Is there an easy way to install Linux similar to Boot Camp?

I've so far been using Disk Utility to partition my Mac's drive and install Linux, but is there an easier way to do it, using something similar to Boot Camp, or a third-party software application that ...
1
vote
1answer
98 views

Startup Disk Full: Core File

The storage on my start up disk is being consumed by some kind of core files labeled as cores:1234 (numerical digits change). I downloaded OmniSweeper, which helped me locate these files and aware ...
3
votes
2answers
3k views

Has El Capitan Disk Utility Removed Encryption Options?

With Mavericks I would unlock an encrypted disk using "Disk Utility", but in El Capitan the "Unlock" button isn't there.
0
votes
0answers
53 views

Merge all partitions back to single volume

I was trying to install windows 10 on my Retina Mid 2015 MBP using bootcamp, and ran into a few problems during the installation. Without going into too much of detail, this is what i have right now, ...
1
vote
1answer
77 views

How to resize the main volume to its original or full size?

I followed the instructions mentioned in one of the threads on this community to expand the Macintosh HD volume to its full volume. I rebooted with cmdR to Recovery Mode, opened Terminal, entered ...
1
vote
0answers
19 views

How to fix this hard disk on a virtual machine?

I have been using OSX on a virtual machine for some time, for developing purposes. From today, I'm starting to have hard disk issues. The Disk Utility Tool says that the hard disk has 107.37 GB, but I ...
1
vote
1answer
3k views

Bootcamp Failing with Error: “The startup disk cannot be partitioned or restored to a single partition.”

I have a 21.5" Mid-2010 iMac i3 in which I am trying to install Windows 8 on. When I went into bootcamp, I received the ever so common error of: When I went to the newly designed disk utility, it ...
1
vote
0answers
12 views

Schedule regular filesystem verification

I recently had a baffling several days troubleshooting some odd network problems, which was eventually narrowed down to my MacBook's Wifi adapter and then finally fixed by performing a disk repair to ...
0
votes
0answers
72 views

How to create (the missing) El Captain recovery partition? [duplicate]

I upgraded from Snow Leopard to El Captain. Before upgrade I had a bootcamp partition, and a third FAT32 partition. this caused some complications in the upgrade process and I had to delete the El ...
0
votes
0answers
14 views

can I recover merged HFS+ partition with TestDisk

I have merged three HFS+ partitions into one using diskutil. The partition in the middle has some very important files. Using Stellar Phoenix Recovery's recover lost partitions option, I could see ...
1
vote
0answers
264 views

SD Card mounted but not accessible in Finder (OS 10.10.5)

On an early 2015 MacBook Air running 10.10.5, Finder will not show SD cards, despite the disk showing up in Disk Utility. In Finder preferences, I have set external disks to be shown on the Desktop ...
0
votes
0answers
248 views

After installation of El Capitan, Bootcamp: “A disk read error occured”

Prior to installing El Capitan, my Windows 8.1 installation was running fine and dandy. Now when attempting to load into Windows via rEFIt, I am faced with A disk read error occured. Press ...
0
votes
1answer
85 views

USB Hard Drive HFS+ Encrypted Partition Formatted / Recovery

I have a WD 1TB USB External Hard Drive that was accidentally formatted. I had formatted the disk and started writing an ISO to the disk (less than 5 seconds), when I realized it was to the wrong one. ...
1
vote
1answer
794 views

How to make Macintosh HD size the same as SSD

So today, I tried dual-booting my late 2013 rMBP on El Capitan with Windows 10. I got to the step within Bootcamp where it was partitioning my SSD, and I went ahead and played a game of Super Smash. ...
0
votes
0answers
33 views

Are slow format speeds indicative of more severe hard drive problems?

I have an mid-2011 iMac, that has 4GB of RAM and a 500GB HDD (not SSD). Over the past few months I have experienced: Fairly frequent beach balls/general system slowdowns A worrying number of errors ...
4
votes
4answers
10k views

Mount Ext4 on El Capitan

I recently installed OS X 10.11 on my Mac. I tried to read a SD card with an Ext4 partition which wasn't even shown in Disk Utility, although diskutil did show it as a Linux partition. I can't seem ...
0
votes
0answers
22 views

Can't find storage after fixing EFI system partition error

I followed How to fix the error: "This disk doesn’t contain an EFI system partition"? In the final step sudo dd if=/dev/disk1s1 of=/dev/disk0s1 I cloned an existing ESP from an internal ...
0
votes
0answers
89 views

Disk utility reports wrong partition size

I am running El Capitan and recently deleted a bootcamp partition. However, I have noticed that Disk Utility is giving me erroneous values when it comes to partition size. When I click on the HDD, it ...