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

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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
91 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

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
62 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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2answers
394 views

Resizing HFS+ volume after cloning

I cloned a disk containing an HFS+ volume to a larger disk using the command line dd utility. Now I want to grow the HFS+ volume to fill the new disk. There's an EFI partition before the HFS+ volume ...
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2answers
970 views

Yosemite cannot detect SD card

I know their is a flood of these questions but I have a late 2013 macbook pro with yosemite 10.10.5 installed on it. My problem is it won't read some of my SD cards, i've run disk util with the pny ...
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0answers
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 ...
2
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1answer
503 views

Cannot erase SD card with Disk Utility (El Capitan)

I have this SD card that I am trying to use to backup photos on a Windows computer. After using the SD card on the Windows computer, and copying the photos back on a safe drive, I cannot erase the SD ...
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2answers
63 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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0answers
41 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
91 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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2answers
57 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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97 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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0answers
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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4answers
75 views

How can I find what is using the rest of my drive?

I am using a Macbook air. 64GB. My user directory has used 20.47GB Disk Utility shows 'Other' is 41.33GB and I only have 2.9GB free. What tools or command line commands can I use to find out what ...
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0answers
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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0answers
36 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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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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2answers
119 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
669 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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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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0answers
320 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
106 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
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 ...
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3answers
4k views

Remove disk image from the disk list

In Disk Utility I see two disk images (Flash Updates) But I cannot find where the image file could be. On the console with diskutil I see /dev/disk2 (disk image): #: TYPE ...
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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
47 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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2answers
359 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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5answers
6k views

How to delete partition disk0s4?

A while ago, I dual booted with ubuntu linux and followed a tutorial on youtube to do so, but later I wanted all of my hard drive to be for osx, so I deleted the ubuntu partition, but now I am left ...
3
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1answer
707 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
votes
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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1answer
94 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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4answers
7k views

partition map check failed because no slices were found

I own an early 2011 MacBook Pro running Mac OS X Mavericks. Recently, I tried to make 50 GB partition using Disk Utility but the whole process didn't complete, and I had to restart the system as it ...
3
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10answers
35k views

Disk Utility won't allow me to delete and resize partitions

I'm running OS X 10.9, and I had a linux partition when I updated from 10.8. Since I updated I can't boot on linux, which is no big deal for me. However, I would like to delete the partition that is ...
31
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4answers
76k views

How to resolve error: “Couldn't modify partition map because file system verification failed”?

I upgraded to Lion and decided I no longer want 100 GB of my drive devoted to Boot Camp, I never boot into Windows, I just use it as a VM anyways. So I deleted the boot camp partition using disk ...
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2answers
539 views

Disk Utility can't repair external hard drive, tried fsck whats the next step?

When I try and repair my external hard drives (I have two corrupt now some how both I think from improperly ejecting from the same machine), I get this message: Disk Utility can’t repair this ...
2
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2answers
2k views

How to remount external drive in OS X El Capitan without rebooting?

I have a MacBook Pro 15 Mid 2014 with OS X El Capitan. When I accidentally disconnect the external USB disk (without clicking eject), I can't reconnect the disk. If I remove and plug the disk back in ...
3
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3answers
215 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) ...
2
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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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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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0answers
122 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. ...
2
votes
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
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 ...
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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 ...
1
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4answers
222 views

El-capitan crashing while booting

Objective: Somehow I want to fix the issue and should be able to login to the El-Capitan without reformating as so many valuable files are there Find what has caused this problem so that I can avoid ...
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0answers
158 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
82 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 ...
0
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1answer
337 views

Unmounted hard drive times out ejecting or mounting

I have a Drobo connected via Firewire to my MBP which is causing me some issues. Here is the diskutil info: Device Identifier: disk2s2 Device Node: /dev/disk2s2 Whole: ...
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1answer
80 views

Disk image of OS + Recovery partition?

I'm working with multiple OS X versions frequently and I'd like to have an image which contains a particular OS version's system partition and its recovery partition. Is this possible? (the disk where ...
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2answers
78 views

Prohibited sign - Can't boot after trying to open Raspian SD Card

So I was following this tutorial https://www.youtube.com/watch?v=Eo4HphBdR10 and opened the folder of the SD Card. The Screen went black and I rebooted. Now I get a Prohibited Sign on boot up. In ...