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

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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
25 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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24 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.
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1answer
25 views

Missing disk space after failed Bootcamp install

Earlier today, while running Bootcamp attempting to install Windows 7 on my late-2012 iMac, I suddenly lost 160g of disk space after Bootcamp failed to create the partition for Windows. Disk Utility ...
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2answers
31 views

How to exercise a new hard drive by erasing multiple times with Disk Utility app?

In El Capitan, in the Disk Utility app, I cannot find the option to rewrite bogus data (zeros or ones) across the entire drive multiple times. I am using a spinning rust platter disk, not an SSD. ...
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1answer
10 views

Macbook pro internal HD not detected

I had a problem with my bootcamped MBP and I tried to format the HD. I wasn't able to format any of the partitions so I tried the following based on ...
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1answer
23 views

Adding partition to disk creates unwanted third partition

I'm using disk utility to try to divide the partition I'm working on, which is 51.28 GB, into one main partition (to run OS X on) and one smaller HFS+ partition (on which I will eventually install ...
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38 views

Merge Partitions with Disk Utility in El Capitan Gives operation Failed error

I accidentally created a partition of 1.05GB space. Went to Disk Utility -> Partition, and I clicked on the - sign to remove it and hit "apply". It gives me the following error: I have another ...
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13 views

Disk Utilities verifies disk with no repairs needed, but Mount says disk must be repaired

I was transferring some files off an old FireWire drive yesterday, but when I turn on the drive today it doesn't automount. I go to Disk Utility and see the drive, try to mount it, and get this ...
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2answers
43 views

Error restoring encrypted disk using Disk Utility

I am trying to replace the hard drive in an old MBP-15 mid 2010 with a new SSD. The old disk is encrypted. I did that on my own two MBPs successfully, but both disks were not encrypted. The Mac is ...
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2answers
76 views

Disk Utility (recovery mode) stuck at loading

I want to do a clean install of el capitan OS. I booted to recovery mode, chose reinstall os x and followed the steps. So far so good. When it came to choose the destination disk where I wanted to ...
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1answer
33 views

I need to make my partitions into a single one after a failed bootcamp, how do i do this?

I am a complete novice when it comes to macs. I recently tried to use bootcamp to run windows 10 and partition part of my hard drive. I used the bootcamp assistant and I followed all of the steps but ...
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12 views

Cannot delete a disk partition OSX El Capitan 10.11.4 [duplicate]

For some reasons that is the only partition I can't delete but it's empty... I don't even remember ever creating it in the first place. As you can see both + and - are deactivated. Is there a way of ...
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1answer
43 views

Missing Space on Drive using Core Storage after Boot Camp Assistant Failure

Using Boot Camp Assistant, I started to create a 50 GB partition, but it hung on partitioning. After waiting about 30 minutes without the progress bar moving, I quit the Boot Camp Assistant, thinking ...
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26 views

How can I add a partition to my Seagate external hard drive?

I am trying to add a partition to my Seagate external hard drive so that I can install Windows 10 on it but it won't let me add a partition at all. With a previous external hard drive I had (that no ...
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1answer
56 views

OS volume shows as type 'FFFFFFFF-FFFF-FFFF-FFFFFFFF' after attempting to delete some Linux partitions—cannot log in

I was unable to just delete the partitions left by an old Linux Mint installation by pressing the '-' button in disk utility. I looked online and read that I could reformat them to a journaled format ...
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51 views

After stuck “Partitioning disk” by Boot Camp

I use a MacBook Pro Late 2011 with OS X El Capitan (10.11.4). I wanted to install Windows using Boot Camp Assistant. However, I got stuck at Partitioning disk.... It seems that it is a very common ...
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16 views

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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22 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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1answer
58 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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16 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
83 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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35 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 ...
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2answers
114 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
55 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
33 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
50 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
81 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
53 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
40 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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30 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
59 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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86 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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20 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
44 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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3answers
318 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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0answers
14 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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26 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
56 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 ...
0
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1answer
46 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 ...
3
votes
1answer
77 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
222 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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0answers
132 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
63 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
20 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
23 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
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1answer
323 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, ...
3
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2answers
59 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 ...