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

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3
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2answers
2k views

How do I pass the following error message in the Boot Camp Assistant: “Please format the USB drive as single FAT partition.”?

I am running the Boot Camp Assistant on El Capitan. Whenever I reach the third screen, titled "Save Windows Support Software", on which I can select an storage medium to save the Windows support ...
0
votes
1answer
14 views

New uninitialised SSD not showing in Disk Utility

I have bought a new Samsung EVO 850 SSD, it is yet unformatted. I have a SATAI/II to USB3.0 dock which I want to use to get the drive formatted, but it is just not showing up in Disk Utility (Recovery ...
0
votes
0answers
6 views

Cannot resize Macintosh HD using (supposedly) available free space

I partitioned my hard drive in order to install Ubuntu, but I now would like to reclaim that space and add it back to my Macintosh HD. I managed to delete the Linux Filesystem and Swap, and Disk ...
0
votes
0answers
11 views

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 ...
0
votes
2answers
18k views

external hard drive found only by disk utility, cannot eject or mount

I'm using a Seagate GoFlex that seems to have encountered some trouble. The drive does not appear on the desktop or Finder. I've double checked that Finder > Preferences allows for it to appear in ...
1
vote
1answer
48 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 ...
2
votes
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 ...
0
votes
1answer
18 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 ...
2
votes
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 ...
0
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0answers
20 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 ...
0
votes
1answer
146 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 ...
0
votes
1answer
2k views

How to Fix Disk Utility Getting Stuck on “Verifying storage system”

Okay, had a brief power outage today that shut down my computer and external drives, so I figured I should run a quick disk check just to be safe. However, when I run try to verify with Disk Utility, ...
0
votes
2answers
40 views

Hard Drive not showing up in Disk Utility

So I arrived home from school today and wanted to use my iMac, but somehow it wouldn't react. I pressed the power button until it shut down (or crashed...) and rebooted it. After rebooting everything ...
2
votes
1answer
2k views

Failed to make bootable USB drive and now I can't even format it

I want to do a fresh install of Yosemite and I got a brand new 8GB flash drive and I followed this tutorial. I formatted the USB drive and was copying the Yosemite installer, however I got the ...
0
votes
2answers
5k views

Repartition hard drive with bootcamp on it

I currently have this setup on my Mac- OS X Mavericks 10.9.3, Windows (bootcamp) and a Recovery HD. My question is can I repartition my hard drive to have another partition, using disk utility (resize ...
0
votes
0answers
25 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?
0
votes
1answer
36k 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 ...
1
vote
0answers
32 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 ...
0
votes
1answer
30 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 ...
1
vote
2answers
1k views

How do I regain unaccessible free space after a failed Boot Camp install on a non-Fusion drive?

Firstly - I know this has been answered, but I am hoping for a more broken down answer, as I am not quite so technically minded, but I can follow instructions! So in summary I have tried to install ...
0
votes
1answer
22 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: ...
2
votes
1answer
4k views

Fixing a broken hard drive's partition map

I have a drive that is corrupted. Disk utility could not repair the disk, so I attempted to follow some tutorials and repair the partitions using pdisk and testdisk, but things have gone south. Now ...
1
vote
0answers
37 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 ...
0
votes
1answer
182 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 ...
1
vote
2answers
3k views

How to Create Images with Yosemite

I have a Mac Mini configured just the way I like it with 10.10.2 installed. I need to deploy that to a bunch of other computers around campus. The usual process for me in the past has been to use an ...
0
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0answers
30 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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vote
0answers
43 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 ...
0
votes
1answer
62 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 ...
2
votes
1answer
3k views

How to create a Mac bootable gparted or Parted Magic thumb drive?

Is it possible to create a Mac-bootable thumb drive containing gparted or Parted Magic without installing a full Linux distribution? I tried several methods like unetbootin (some blogs suggest this ...
3
votes
2answers
7k views

diskutil coreStorage in Lion fails to create a concatenated LVG, error -69886

I would like to create a logical volume group (LVG) with two physical disks. Issue The command: diskutil coreStorage create LVGNAME /dev/disk1 /dev/disk2 returns: Started CoreStorage ...
0
votes
2answers
2k views

Can't Delete Partition

I created a partition to run Snow Leopard on my computer running El Capitan and no longer need it. I allocated 20GB to that partition. Here's what I've done. I first go into Disk Utility, select my ...
0
votes
0answers
25 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?
0
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0answers
33 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 ...
18
votes
14answers
186k 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 ...
6
votes
3answers
34k 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 ...
1
vote
1answer
38 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 :) ...
0
votes
0answers
13 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 ...
3
votes
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 ...
-1
votes
1answer
68 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 ...
0
votes
1answer
29 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 ...
1
vote
1answer
2k views

Bootcamp system operating missing error after resizing partition

I resized my partition to increase my bootcamp drive few months ago on Disk Utility on Mac and after that I decieded to have more space on Bootcamp partition so I resized it again by set new size for ...
2
votes
2answers
502 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 ...
0
votes
1answer
26 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?
2
votes
2answers
1k views

Orphaned inodes in SSD in MacBook Pro Early 2011

I have a Macbook Pro 15″ Early 2011. Last year I changed the disk to put a new Samsung SSD (Evo). Recently my computer was really slow. I rebooted on the recovery partition, and tested my disk with ...
2
votes
1answer
50 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 ...
2
votes
1answer
2k 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 ...
1
vote
1answer
74 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 ...
1
vote
1answer
27 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 ...
0
votes
0answers
24 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 ...
1
vote
1answer
39 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 ...