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

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Macbook Pro does not recognize brand new internal hard drive

I have a 13.3" mid-2012 2.5 GHz Macbook Pro and wanted to upgrade the internal HDD from the factory standard 500GB capacity to a 1TB. I popped the bottom case, discharged any static, undid the screws ...
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31 views

Disk Utility will not repair permissions

I have tried to repair permissions multiple times using Disk Utility.app and also using the command-line diskutil. I always get the same output, so apparently it's not fixing the problem. I've also ...
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1answer
12 views

Grey screen apple logo prohibitory sign etc MacBook 2009

I have an older Mac book that will not boot. I have tried all key commands including fcsk which resulted in a "mach kernel" end result, so nothing worked. I don't have a system install disk (bought ...
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31 views

OS X Internet Recovery doesn't see SSD drive

I wanted to do a clean install and booted from OS X recovery partition. In disk utility I selected "erase" option. SSD was working correctly before that. Now, if i startup, the only way to proceed is ...
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14 views

Lenovo firmware ISO ruined my USB thumb drive - how to fix?

I've never seen this kind of thing before. I have a 32GB thumb drive, which I tried to put a Lenovo BIOS/firmware updater on. It didn't work out, so now I'm trying to format it, but I can't. Mac OS ...
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35 views

Corrupted WD hard disk? Macbook Air says “hard disk not readable”

So one night I finished editing a video and I was so excited that I got up and realised the hard disk was still connected to my Macbook Air. When I stood up, the hard disk was hanging on the Macbook ...
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27 views

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

I have two partitions on my MAC both formatted as Mac OS Extended but only one has macOS on it. When I start the Bootcamp Assistant to install Windows 10 I get the following message: How to fix ...
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39 views

Format the External Hard Drive from Hell

I have an external drive that is basically completely screwed. It’s just for backups, and I have redundant backups, so I don’t care about losing the data, I just want to completely format it and get ...
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25 views

Needing to run fsck -fy “often” should I send to repair?

Every month I usually give a go to Onyx so I repair all permissions and such. Every time I do that, I get that I need to repair the Disk and I end up having to boot with the single user (in which I ...
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1answer
29 views

Cannot mount USB with anything, including Disk Utility

I am trying to connect a USB to a Mac I am using, and i cannot seem to. When i plug the device into the Mac, i get an error that reads 'The disk inserted is not readable by the computer.(It contains ...
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21 views

Transferring Windows 7 OS from my Mac to an external harddrive

So, in disk utility my Windows 7 is under the same internal hard-drive as the Mac OSx, but it shows that my Windows 7 OS is also not-mounted and the format is MS-DOS (FAT). I want to literally just ...
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5 views

Cannot make a new partition out of empty disk space

El Capitain on a Macbook Pro 2012. I have more than 100GB of empty (unpartitioned) space on the main hair drive but the Disk Utility does not allow me to partition it. All the controls (partition name ...
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1answer
22 views

External Hard Drive Doesn't Initialize

I have just purchased an 2.5" external hard drive enclosure to accommodate my 2.5" SATA hard disk for use on my El Capitan 10.11.5 MacBook Pro Retina 15 (A1398) computer. However, every time connect ...
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29 views

Lost access to partition in a Fusion Drive Mac OS 10.11.5

Lost access to the boot drive with name Mac Mini, Logical Volume A6452696-4CBC-4909-81C4-9B636940587A, size 1.1 TB Mac OS X El Capitan 10.11.5 Can't mount it, can't delete the volume in Disk Utility ...
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1answer
35 views

WD My Passport 0820 USB HFS+ data disk drive partition problem following accidental use of Recovery Assistant

I have edited this post in view of recent developments I have a 2 TB USB Disk used for all my data. I accidentally ran Lion Recovery Disk Assistant on it, instead of my Pen Drive, to make a bootable ...
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1answer
92 views

Switch back to HFS+ from APFS

Recently I heard about new apple file system. Of course I wanted to try it. So I moved all files to one external hard drive for safety... And accidentaly switched it to APFS... How to revert changes? ...
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2answers
81 views

Unable to recover disk space Mac OS X EI Capitan

I deleted one partition on my mac and now I am not able to recover that space. diskutil list shows below output. Here I see total space is 500 GB and size of Yosemite(installed El Capitan on it) is ...
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27 views

Mounted drive does not show up on Disk Utility, Desktop, Finder Sidebar

I've an external drive that consists of 2 partitions, one NTFS that I use for storing stuff and one Journaled that I use for TimeMachine. I've connected the drive to my Mac but now the NTFS partition ...
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12 views

Cannot expand Macintosh HD after deleting Linux partition

I recently deleted an Ubuntu (ext4) partition on my MacBookPro11,2 in order to reexpand my OS X partition to take up the whole drive again. This is how my partition table looks like at the moment: ...
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1answer
29 views

Is it possible for only a part of the HD of my MacBook to not work properly?

My MacBook suddenly crashed yesterday. On startup, the computer would always shut down after a few seconds. I used ⌘ Command R to go into Disk Utility from Recovery HD to see what the problem was and ...
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1answer
25 views

Sluggish 2013 21.5" El Capitan iMac

My second hand 2013 iMac has been running really slowly. I have already done a complete wipe and reinstall, but that didn't help. trying to get to the bottom of this, and suspecting imminent HDD ...
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37 views

Can 'Repair Disk' in Disk Utility harm my data?

I have a MacBook Pro 2011, which suddenly isn't booting properly. When it starts I press Cmd+R to get to Disk Utility, and I used Verify Disk and got: Invalid leaf record count (It should be 2142 ...
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1answer
52 views

Mac will not boot into OSX after installing windows 10

Please help me I'm completely desparate. I have tried to install Windows 10 and it completely messed up my macbook pro system, I cannot boot into my mac, and it's full with things I desperately need. ...
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19 views

How to fix Toshiba external hard drive with missing EFi system partition?

I plugged my sister's Toshiba hard drive into our TV. After I unplugged it and plugged in back to our computer it says that the disk cannot be read so I tried to repair it using the Disk Utility on ...
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24 views

Can't create a new partition on an external drive's free space

I have a USB2, 500GB external hard drive that I use for Time Machine backups. In order to test something, I created a new partition in the drive, roughly 30GB in size. Once I was done with my tests, I ...
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1answer
40 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 ...
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1answer
24 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 ...
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20 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 ...
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1answer
54 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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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
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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97 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 ...
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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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55 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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1answer
44 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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56 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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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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50 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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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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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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69 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
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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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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1answer
88 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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356 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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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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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
70 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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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 ...