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

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Lost disk space after partitioning w/ disk utility crashed

I made the mistake of deleting a bootcamp partition thru disk utility in hopes of making a larger partition with a fresh windows install. As I tried making a new FAT partition in disk utility I ended ...
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28 views

El Captan disk utility did not see erased partition after fail bootcamp install

I try to get my full drive after fail a bootcamp install of Win. Now I have removed extra partition from my fusion drive, but can’t see empty space using the el captan disk utility. Using shell, ...
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77 views

How to install a bootable ISO onto a single partition of a usb stick?

Previous questions/answers dealt with the simple case of a single partition on the USB disk that was just overwritten with dd. Also it looks like the disk utility gui doesn't allow creation of ...
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17 views

macbook ssd hard partition unmount

Yesterday my fiend used my macbook to set his flash memory bootable but he made mistake and select my mac disk volume instead of his flash! Now when I restart macbook it shows a slasher question ...
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1answer
96 views

Messed up my 1TB Fusion drive on my iMac with Disk Utility

Soooo something bad happened recently with my 1 TB Fusion drive on my 5K late 2015 iMac. I was creating a new 100 GB partition on my disk. So while the disk utility was busy scanning etc (doing its ...
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38 views

My partition is using negative space. Should I worry?

As you can see, according to Disk Utility, I'm using negative space in /dev/disk0s7. This is obviously incorrect, however, I am slightly worried as to what this may mean for the partition's effects on ...
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2answers
124 views

Windows failed to start after upgrade to El Capitan

There is something very frustrating I am trying to figure out for a few days. My MacBook Pro has a 500 GB hard drive. It had Mac OS 10.6.8. There was a Windows7 installation done some time ago via ...
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16 views

Isolate Partitions

I'm trying to partition my HD into a 'anything is ok' development/beta type drive and a no bs allowed drive. Not a fan of these drives having access to each others applications and file systems. ...
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1answer
61 views

No Macintosh HD in Volumes folder

I am running in recovery mode to save the data from disk( I cant login due to deletion of private/var folder). I opened Terminal and went to Volumes. This folder should be populated with the Macintosh ...
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1answer
36 views

Unidentified hard disk space getting in OS X apps section

Last night I got an issue with my MacBook Pro. After updating the OS to El Captain it shows the 50+ GB storage space for the Apps section. But after a couple of hours it shows 160 GB space. It's ...
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1answer
65 views

Deleted Bootcamp partition and it just disappeared. Nothing to merge with OSX partition

I had Windows 10 Bootcamp on my MacBook Pro 15" 2015. I just tried to remove the Bootcamp with Bootcamp assistant by clicking "restore" and it gave me an error saying "The disk cannot be partitioned ...
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1answer
92 views

Create El Capitan install partition

I went through a lot of articles on how to create bootable os x install partition but eventually I ended up with a need of making resize of my system partition - unfortunately DiskUtility shows this ...
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1answer
63 views

Accidentally ran command to erase volume with “no format”, how can I get it back?

I accidentally ran this command and now I am missing 100gb of space, how can I get it back? All help appreciated!! diskutil eraseVolume free %noformat% disk0s2 Terminal gives this diskutil info: ...
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9 views

Space needed to finish install of El Capitan [duplicate]

So I tried to install El Capitan to my 2011 MacBook Air and it froze at 15 minutes left. I left the computer this way for a few hours before powering it down. Since then I've gotten an error every ...
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2answers
65 views

Merge partitions with Macintosh HD

This is my diskutil list. I wish to merge Misc (disk0s4) with Macintosh HD (disk0s2) leaving only Macintosh HD (disk0s2). Normally I would use this command to merge the two disks: diskutil ...
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43 views

Encrypted Seagate 5TB External HD Unable to Mount

Been roaming informational posts all over the web about similar situations and I see it's a common issue but none of the solutions seem to work. This is my wife's external hard drive which she stores ...
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1answer
95 views

How to change password of the .sparseimage encrypted image on El Capitan?

I have an encrypted .sparseimage, and can't change password. Don't see any option in Disk Utility. Is it possible and how to change password of the .sparseimage encrypted image on El Capitan?
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100 views

How can I repair hdd using Disk Utility if First Aid options (Repair, Verify) are all greyed out?

Would really appreciate any help in fixing an external drive so can use with my Mac again. I had a power loss & when computer rebooted it was unable to see the attached Freecom 320Gig Hdd (FAT32 ...
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24 views

New USB Drive Cannot be accessed

Suddenly my PNY USB 3.0 Flash Drive has stopped working. It doesn't show up in Finder, Windows starts going crazy when I plug it in, Linux says the device could not be opened, and Disk Utility also ...
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2answers
60 views

Change ISO volume label on OS X?

I have some ISO files here with weird volume labels. I want to rename them to something I can easily remember. I know in Windows using either winiso or poweriso (both are non-free?) it can be done ...
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4answers
616 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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17 views

OS X stopped recognizing my HFS+ Time Machine partition on my USB GPT disk

I have a 2 TB USB drive that's using GPT, but OSX (10.11.4) on my macbook pro (early 2015) stopped recognizing my HFS+ partition after I inserted a partition before it ("TESTPART"), effectively making ...
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37 views

Partition map check failed because no slices were found for SD Card

When I connected my sd card to macbook, I got the error "The disk you inserted was not readable by this computer". I ran following commands ~ diskutil list /dev/disk2 (internal, physical): #: ...
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2answers
130 views

Difference between “diskutil unmount” and “diskutil unmountDisk”?

Sometimes when I try to unmount a disk using the "diskutil" command I get the following message: $ diskutil unmount /dev/disk1 disk1 was already unmounted or it has a partitioning scheme so use "...
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1answer
51 views

How to restore OS X drive to factory defaults?

I turned off the Core Storage volume manager on my OS X partition (i.e. diskutil cs revert). Now my Recovery HD displays in Disk Utility and in Startup Manager. I don't like this and would like to ...
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1answer
83 views

Reformatting disk with no partition map

I have a 250GB hard drive that I tried to "burn" an ISO to (to make it bootable). Something went terribly wrong.This is what the disk looks like in Disk Utility (unmounted). When I mount it, this ...
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1answer
731 views

Cannot delete or merge old boot camp partition in El Capitan

So i've battled with this for quite some time, look up various topics with various solutions, however i have yet to succeed with merging my partitions into one. I had previously installed windows 10 ...
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340 views

Terminal Error: pointer being freed was not allocated *** set a breakpoint in malloc_error_break to debug - Unable to Repair Permissions

I'm getting an error when I open Terminal saying: login(495,0x7fff77186000) malloc: *** error for object 0x7f8cdad0b780: pointer being freed was not allocated *** set a breakpoint in ...
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1answer
108 views

corestorage failure: missing disk, how to recover data?

This morning, my iMac show me the prohibit sign. After hours of struggling, I'm facing this: the Mac does not want to boot up. I have a lot of recent files to recover, but have this issue: root# ...
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1answer
25 views

35 “Flash Player” in DiskUtility

from sudo diskutil list I get 35 of these /dev/disk35 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: Apple_partition_scheme +...
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1answer
26 views

Disk utility killed my external drive

I have a problem with disk utility. I have a external USB3 drive, formatted HFS+. It should hold roughly 500GB out of 1TB of Data. Now Finder told me, that the data was there but no files were visible ...
3
votes
1answer
751 views

Not enough storage for El Capitan; no way to free up space

I wanted to upgrade my Macbook 2008 from Yosemite to El Capitan. Unfortunately, when I downloaded it and restarted my computer, on the "select the disk on which to install" page the only location, ...
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2answers
71 views

Do files copied to an encrypted disk image (dmg) encrypt themselves?

Disclaimer: I'm not sure whether or not this belongs in Ask Different or security.stackexchange.com, but I'm using a .dmg and Disk Utility, so I'll put it here. End of disclaimer. The title says most ...
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2answers
382 views

Failed bootcamp partition, now can't remove it

Tried to set up Windows 10 on my Macbook Pro 15" (Mid 2014). Running El Capitan 10.11.3. Windows refused to install (GPT partition only problem?). I followed steps elsewhere to remove and reformat the ...
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1answer
49 views

Error when encrypting .dmg disk image

I have a .dmg file of approximately 32 GB and I want to encrypt it. When I try to, using Disk Utility > Images > Convert, I get an error "status 28". Any idea what this means?
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1answer
99 views

How to format a Seagate HDD to OS X Extended (Journal) with Disk Utility

I have just got a new external hard disk, the Seagate Expansion 2 TB, and I am trying to format it to work on my Mac. I was told that I had to erase the disk and format it to OS X Extended (Journal) ...
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2answers
518 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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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 ...
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1answer
36 views

OS X Disk Utility shows more data

On OS X El Capitan Disk Utility shows me that I have 48 GB Movies, but I don't have this films really. Where can I find these movies that shows Disk Utility?
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125 views

Lost disk space after boot camp

The title is self explanatory, I lost disk space after a fatal Boot Camp manipulation. I deleted the Boot Camp partition, I did a fdisk -fy command and I ended with ~50 GB of unallocated disk space. ...
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0answers
11 views

Manually copy .ISO to bootable USB (without Bootcamp) [duplicate]

I want to create a bootable Windows USB from my Macbook manually as an alternative to Bootcamp. I've downloaded the Windows 10 ISO file. Formatted an 8GB USB with MS-DOS(FAT) with a Master Boot ...
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0answers
13 views

Boot Camp says there is a partition when there isnt one

My boot camp is keeping me from using it because it says there is more than one partition (which i may or may not have made in the past). When i go into the disk utility it only shows the internal ...
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0answers
22 views

iMac partition grid screwed. Please help?

So yeah i guess i screwed up my iMac 5k retina's (late 2014) partition grid big time and i need your help. It all started yesterday when i tried to format my computer. I'm selling it tomorrow, that's ...
2
votes
1answer
47 views

About This Mac > Storage shows 10GB Backups, but Time Machine is Disabled

I'm trying to figure out what's going on with my storage. About This Mac > Storage shows that there's ~11GB of Backups. Disk Utility seems to sort the same files as "Other". Googling tells me that ...
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0answers
164 views

Missing space in OS X El Capitan after removing a failed Boot Camp partition

I'm trying to help my girlfriend after a failed Boot Camp partition removed approx. 100 GB of visible space from her OS X volume. The main volume is encrypted with FileVault2. Partition table: [...
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2answers
83 views

Mount all mountable partitions of a removable disk with diskutil

I have a USB drive containing 2 FAT partitions which are automatically mounted when the drive is plugged in. If I run diskutil unmounDisk <device> and then diskutil mountDisk <device> I'd ...
3
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3answers
222 views

Command line equivalent of Disk Utility, which is not diskutil, to obtain UUID

Following on from the answer to Can you make OSX mount just certain partitions when you connect an external HDD?, all of the sites that I have checked (CNET, OSXDaily, Apple Support community threads) ...
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1answer
130 views

El Capitan Resize VM Partition

So I have this VM in my VMware Fusion, I add 5GB of space to the HDD but then I got this message saying resize the partition: But when I login to my VM and launch Disk Utility, I am not seeing the ...
2
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1answer
34 views

Error while unpartitioning hard drive?

I've tried to install Ubuntu (and gave up), but now there's a stuck partition, of 24.22 gigabytes. The pink shows the partition. I want to unpartition it, but when I try to delete it, an error ...
3
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1answer
143 views

Cannot reformat external drive with no file system

This whole mess started with trying to encrypt Time Machine backups. I have a 4TB Lacie P9230 external drive which has been working for about a year just fine. The drive has been partitioned into two ...