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

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Deep sleep with unmounted SD Card (but inserted)

This question is to clarify the question asked in here. Basically it is regarding using SD Card for extra storage and this question is useful to those who doesn't shut down their laptop often and ...
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1answer
57 views

How do I copy a partition of an Image to a partition of a physical disk?

I finally had a bootable usb key working with a windows 7 install ready to go, when I realized that once the Language selection came up, my Macbook Pro's keyboard and trackpad no longer functioned and ...
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1answer
3k views

cannot boot. volume disappeared from boot option after Disk Utility (GUI) repair

I have a 13-inch MBP with the latest OS X version. Problem Yesterday, I went to the Recovery Mode and performed Repair on my boot volume. I was not having a problem, but I just wanted to verify and ...
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1answer
23 views

MacBook Pro installation failure (recovery, internet, or disk)… what now?

Inherited a MacBook Pro (2010 MacBook6,1 17"). Starts up fine, but wouldn't boot - no operating system found. Hard drive does not appear to be bad (see details below) but I can't seem to get it to ...
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3answers
6k views

Cannot format MacBook Air SSD, stuck at waiting for disks to reappear

I have a Macbook Air with 128GB SSD and 4GB RAM with OS X Mavericks. I was using my Mac normally but suddenly Chrome got stuck. So I held down the power button and force-shut down the Mac. When I ...
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0answers
25 views

Cannot Enable Jounraling (OSX Lion 10.7.5)

so I am trying to enable journaling on my main disk. I booted up from a thumb drive with OSX installed on it and opened disk utility, and the button enable journaling is greyed out and unclickable. It ...
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1answer
195 views

How should I properly format my iPod nano 5th generation?

I've been the happy owner of an iPod nano 5th gen, 8Gb for a few years. Over the years, I've added and deleted many songs, lyrics, album art, etcetera, and I recently assumed that something was ...
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0answers
27 views

Lost disk space

I was creating a second partition. After a while the Mac didn't react. I forced-quit the Disk Utility. Now I have one partition of 556,24GB on my HD of 1,12TB. How can I get my lost space back?
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1answer
37k views

How to recover my harddrive if I can't see it in the disk utility

I have a 2007 aluminium iMac which I upgraded months ago to Mavericks. Today it locked up and I held the power button to shut it down and cannot get it to start again. I get the flashing folder ? icon ...
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0answers
64 views

How do I expand the hard drive partition of an OSX guest OS in VirtualBox when the disk has been enlarged?

My host system is running OSX El Capitan 10.11.5 and VirtualBox 5.0.22 r108108 Using the information found in another answer, I was successfully able to extract an ISO of my host operating system and ...
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0answers
49 views

Time Machine External Hard Drive stopped being recognized

So I got a 2015 rMBP last year and also got a WD MyPassport External Hard drive with it for Time Machine backups. It ran perfectly a few times a week until yesterday when I plugged it into my Mac. It ...
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1answer
49 views

How to erase DVD-RW in Disk Utility

I have a MacBook Pro Mid 2012 with built-in SuperDrive. MacBook Pro is running OS X 10.11. I am trying to erase a DVD-RW disc that is filled with some images. But the erase option is greyed out: ...
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0answers
63 views

I deleted Windows 10 Boot Camp partition but Mac still boots to Windows

I recently installed Windows 10 via a partition from Boot Camp Assistant but had a lot of issues with it; mainly the fact that after about 10 minutes of using it Windows crashed and took me to a blue ...
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1answer
387 views

OS X El Capitan suddenly can't open DMG files

I am trying to open a DMG file to install an OS X app. I get the error The following disk images couldn't be opened. Invalid Argument. I have tried to open other DMGs that I successfully managed to ...
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0answers
58 views

Resizing sparsebundle in Disk Utility

I want to resize (shrink) the capacity of the backup.sparsebundle to approx. the size actually taken up the files. What I did thus far I already compacted the image: # hdiutil compact backup....
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0answers
73 views

Freecom HD Freecom 1TB encryption “A partition, not a whole disk, is required for this operation”

I have a Freecom HD Freecom MG (1000GB, Aluminium) which I wish to use as a Time Machine disk. I tried to encrypt the disk but got the error "A partition, not a whole disk, is required for this ...
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1answer
68 views

Bootcamp problems have left my hard drive a mess

I have been trying to install Windows 8.1 via Bootcamp, and have had several problems that have resulted in failures (those are perhaps a different post). I'm using Yosemite. Currently when I run ...
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0answers
32 views

Can't delete a partition on my HDD

I have created a new partition to install a new OS. Now, I would like to delete the old partition on my hard drive. Delete button is inactive. Screenshots: What I'm doing wrong?
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0answers
35 views

How to distinguish a filesystem corruption from a hard drive failure

If I understand correctly when Disk Utility starts throwing errors during a disk verification there are three possible outcomes: some errors can be fixed on the spot via the repair disk ...
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14answers
191k views

How can I repair a disk that Disk Utility says it can't repair?

I have an external hard-disk with a single Mac OS Extended partition. This disk stopped working couple of days ago. I tried to repair the partition with disk utility but no luck. The error message is ...
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3answers
37k views

I think I messed up the Fusion Drive on my 1TB iMac (with BootCamp)

this is a somewhat similar post to this one (Can't create partition on free space with Disk Utility) but not quite... It started with me creating a BootCamp partition (around 145 GB) for Windows ...
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1answer
42 views

Can't boot my MacBook Pro with Fusion Drive

I have checked almost all the "messed up the fusion drive" posts and don't find any close one to my situation, so I decide to ask a question and hope someone can help me, especially @klanomath :) ...
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0answers
28 views

Mac Stopped detecting external hard disk

I have 4TB Seagate HDD, it was working fine till this morning on my mac(Yosemite), but when I plugged it in today.. it shows "The disk you inserted was not readable by this computer." HDD gets ...
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2answers
8k views

How to repair external hard drive that fails diskutil with 'Disk Full Error'

If I run fsck_hfs -y -d /dev/rdisk2s10 it putters along, rebuilds the catalog B-tree then fails when writing the new catalog to disk. bash-3.2# fsck_hfs -d -y /dev/rdisk2s10 ** /dev/rdisk2s10 Using ...
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1answer
91 views

Messed up 1TB Fusion Drive Partitions (on iMac 5K) - 100% Disk Space used

my I'Mac 5k won't boot. What happened: I did some image editing in photoshop and instead I resized the image to 1100px i typed 11000px. After this mistake i got the rainbow circle of death. I tried ...
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1answer
31 views

How to reclaim unoccupied disk space with Disk Utility?

I have a 2015 MacBook Pro which I tried to set up for dual-booting OS X and Linux. It resulted in some unclaimed free space on my SSD, see screenshot below. Unfortunately, I am unable to reclaim that ...
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2answers
731 views

Not enough free space on OS X Base System while installing El Capitan with VirtualBox

I am getting an error while installing OS on Virtual Box machine, that there is not enough free space as shown in the image. I allocated 20GB while setting up virtual machine, and 8.8GB is what apple ...
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1answer
28 views

External Hard Drive Size Problem

I recently bought a 4 TB Seagate Desktop Expansion external hard drive. However, after formatting it with Disk Utility the device still says 4 TB but the capacity says 1.8 TB. What is going on?
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1answer
71 views

Drive unmountable FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF issue

I have the standard single drive inside my MBP. The issue is inside my external usb drive. The HDD had 4 (visible) partitions: My Passport (Core Storage volume) 959 gb SSD (backup for my mbp) 339 ...
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1answer
3k views

OSX El Capitan / Not Recognizing USB Hard Drive

I updated to OSX El Capitan a few weeks ago, and ever since I did so, my computer is having some issues with my Seagate USB 3.0 hard drive. In terminal, when I use the disk utility, the drive shows ...
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1answer
94 views

How to Make OS X Partition Smaller?

System: SIP disabled, Macbook Air 2013-mid, about 120 GB SSD, 8 GB DDR3. My current disk state OS X portion I want to decrease OS X portion and move it to other but trying to startup partion, I ...
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1answer
36 views

Disk Utility of 10.6.2 install disk does not recognise SDD; Disk Utility of El Capitan does

I ordered and installed an SSD in my 2010 iMac (10,1). I tried installing El Capitan via USB. This failed and searching the internet I found out that it is best to use the original install disks. So ...
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0answers
25 views

Macbook Pro Retina stuck at boot sequence

I have a Macbook pro 15 inch retina with a windows bootcamp partition installed. Recently I used disk utility to repair my Macintosh HD partition, however I can no longer boot into it (bootcamp ...
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1answer
40 views

Recover deleted partition space

I am having the exact same issue when it comes to not being able to reclaim space as in the answered question below... Reclaim hard drive space from deleted partition and reclaim Apple bootloader I ...
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2answers
58 views

Missing disk space after repartitioning

I tried to make a partition and then tried to undo it. Now, I don't know how to get the missing disk space back. As you can tell, I have 751.28 GB disk. Macintosh HD and Recovery HD have 557.4 GB. ...
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1answer
117 views

Can't delete/merge my partitions on OSX

Yesterday I tried to install Win10 through bootcamp, but it couldn't install it on the premade partition. Eager as I was i meddled with the partition scheme during the installer but with no result. ...
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1answer
17 views

Confused about Compressed option in Disk Utility?

When I use Disk Utility to create an image, it gives me five options: Read only Compressed Read/Write DVD/CD Master Hybrid Image Most of these make sense to me why someone would prefer one option ...
26
votes
6answers
38k views

Resizing or expanding a CoreStorage volume

I bought a new SSD with 750 GB and made two partitions: 600 GB and 150 GB. The smaller one was thought to be a Bootcamp partition one day, but to date it was just another unused partition. When I ...
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1answer
53 views

Moving Recovery HD partition to end of disk

This is my current partition map: $ diskutil list /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme ...
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votes
10answers
68k views

Macbook HD “Other” all the Sudden Almost Full

As you can see in the below image, my HD "Other" category is almost full. A couple of days ago, I randomly kept getting a popup saying that my disk was almost full. Then I went in and noticed the ...
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1answer
118 views

Unable to erase, reformat, or repartition USB drive

This afternoon I attempted to mount a .iso of Windows 7 to a bootable USB drive. It's about 370GiB, so more than enough to store it. I did the following to get myself into this mess. Note,/sda/disk2 ...
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votes
4answers
1k views

How to mount disk by UUID or LABEL in OS X El Capitan?

I get the UUID and label of a disk from diskutil info disk0s4 diskutil info disk0s4 Device Identifier: disk0s4 Device Node: /dev/disk0s4 Whole: No ...
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1answer
160 views

First Aid Fails on External Disk, what can I do from here?

History: Running an iMac late 2011 and updated the OS to Yosemite when the computer stopped booting. I have a history of killing HDD so I figured it was a bad HDD and I went to change the drive. ...
13
votes
4answers
46k views

“Warning: SUID file has been modified and will not be repaired” after repairing disk permissions

Warning: SUID file “System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent” has been modified and will not be repaired. I keep getting this after running Disk Utility to ...
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1answer
25 views

Repairing permissions twice gives the same result

If I repair permissions twice in a row, without launching any apps or processes while I do this, the results are almost the same: Why is it that the second time around, the problems seem to be ...
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1answer
53 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
266 views

Flashing folder icon appeared once after changing Macbook hard drive

About 2 weeks ago, I updated my late 2011 Macbook Pro hard drive to a Crucial MX100 solid state drive. The drive installation and data migration went fine with no issues, but today I found the ...
2
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3answers
5k views

Restore Recovery HD partition from Yosemite downgrade

I recently got back to Mavericks from Yosemite, everything went fine. As I normally do, I checked my HDD with the Disk Utility and found some trouble, then I boot on recovery mode to fix my HDD. I ...
2
votes
1answer
133 views

Partition type suddenly FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF, drive unmountable

I have two drives inside my MBP, an SSD for the OS and the original HDD for large Data. The HDD has 3 Partitions: My Data (Core Storage volume) 20Gb for Linux 4Gb for Linux Swap Recently I ran ...
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1answer
46 views

How do I increase the size of the main partition?

As indicated in the screenshot I can't increase the size of the main partition.