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

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53 views

Need help fixing hard disk partition map

I have a 500GB Samsung 840 PRO SSD drive. Until recently it was the primary hard disk in my Macbook Pro (late 2011 17"). I got a 1TB SSD which I decided to use as my primary drive instead, and put the ...
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1answer
55 views

How to partition a pen drive with Disk Utility in El Capitan?

I've a 16 GB pen drive and I want to partition it like this: two MBR partitions: FAT - 1GB default (HFS Plus journaled) - remaining. How to do this in El Capitan?
4
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1answer
156 views

Remove Ubuntu and grow Mac partition

I'm new to the whole Mac world, and the first thing I did when I got my MacBook Air 2015 was I installed Ubuntu, but have regretted it now and want to remove it and get my space back into the Mac ...
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0answers
50 views

Delete button for partition not clickable in Disk Utility

I had another partition on my MacBook where I had Windows installed (the partition is called BOOTCAMP). I am not using Windows at all any more, so I would like to delete the partition on my hard disk ...
0
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1answer
23 views

Formatting mac and encrypted memory

Currently I have a 128GB SD for data in my macbook, but is encrypted using utility. If I format my mac, the stored key will be gone. How can I do this safely? Is there any way to do this without ...
1
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1answer
141 views

Cannot use Disk Utility to create partition from free space on external USB drive

I have a 3 TB Western Digital red disk in a USB hard drive dock. The drive is GPT, and I have two volumes on it (one volume is "Microsoft Reserved", other volume is NTFS). The other part of my drive ...
1
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0answers
34 views

Can not resize disk image file .dmg

I've found that OS X supports .img files which might be resized after it was created. Interesting thing is I can not resize more than 1 time :) is it real limitation or I'm doing something wrong ? ...
0
votes
1answer
121 views

Why can't I format my blank SSD from OSX Recovery?

The SSD in my Macbook Pro died suddenly. I bought a blank one, installed it as the internal drive, and booted into recovery mode by holding Command + R. After letting it connect to WiFi and download ...
3
votes
1answer
138 views

Accidentaly converted from a basic disk to a dynamic one

I got a MacBook Pro (13-inch late 2013 retina) So I installed Windows 7 using bootcamp and all was fine. I then needed to create a 32MB FAT16 partition, when Windows prompted me to convert to a ...
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vote
2answers
129 views

Fusion drive is not working although the system can find the SSD

I own an iMac late 2013 with a fusion drive. Recently I installed Windows 8.1 using Bootcamp on a separate partition on my disk. After a few days, the booting process of OS X started failing and I had ...
0
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2answers
827 views

Cannot format SSD in optical bay

I tried to install a new SSD with higher capacity in the optical bay. But OS X cannot format the SSD. I also tried to swap with an HDD but same problem with HDD. Failure format or something like this. ...
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2answers
51 views

Missing disk space after repartitioning

I tried to make a partition and then tried to undo it. Now, I don't know how to get the missing disk space back. As you can tell, I have 751.28 GB disk. Macintosh HD and Recovery HD have 557.4 GB. ...
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1answer
105 views

Disk utility won't let me use the restore option to get a .dmg image onto a USB

I'm tying to make a bootable Debian USB drive. All I need to do is restore the USB drive from the Debian dmg. I get this error. The debian.org documentation is not helpful with this specific issue. ...
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0answers
195 views

Can't make new partition due to error “volume Macintosh HD was found corrupt and needs to be repaired”

When I run Disk Utility on my 2012 MBP (SSD, running El Capitan) I sometimes get the error: The volume Macintosh HD was found corrupt and needs to be repaired. Other times, I get no errors. ...
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0answers
20 views

El Captain Partition removal won't work

I want to remove a partition but the disk utility won't let me and I can't figure out why. Here is the terminal output I want to remove the untitled partition I have created a backup... If I start ...
0
votes
1answer
24 views

Copy not possible from ssd to another ssd

We want to move 30GB of data located on a 128GB ssd to another 120gb ssd. This is not possible as disk utility says that /dev/disk2s2 doesn't have enough space. The data we want to copy is os x ...
0
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1answer
67 views

Disk utility will not allow me to resize a partition on an unencrypted external hard drive

I want to back up a copy of Windows onto a new partition of external hard drive currently formatted in exFAT. I don't know how to use Windows, so I want to use my Mac (mid-2009 MacBook Pro, running ...
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0answers
38 views

Regain access to OR get rid of Windows, Linux partitions

(Note: this question is regarding an early 2015 MacBook Air (256 GB 2.2 GHz) running OS X Yosemite 10.10.3) I have happily been running my laptop dual booted with windows - installed as 8.1 Pro, ...
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vote
1answer
35 views

How to image USB drives without having OS X mount them afterwards

I am using OS X to write USB drives. I have a disk image and am using dd to the raw device to create the drive image. The problem I'm having is that OS X is automatically mounting the drives as soon ...
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0answers
272 views

Reclaim unallocated disk space on El Capitan?

So I decided to dual boot Ubuntu and OS X using rEFInd a few month ago. I originally partitioned about 15 gigs for Ubuntu, but I later decided I didn't need that much space. I used a live stick to run ...
1
vote
3answers
20k views

USB Drive Will Not Mount, Not Listed in Disk Utilities, but Found In System Profiler

I have a Seagate FreeAgent Go drive with the optional docking station. I use it to keep files that I don't access on a regular basis and as a place to do "quick backups" of things like my Paperless ...
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0answers
15 views

Mount dmg at a specified path

IS there a way to mount a particular dmg at a specified path. I don't want to mount it at /Volumes; just testing something.
2
votes
1answer
36 views

Large (800 GB) Disk Image on Time Capsule as pseudo-NAS?

I am considering getting a new Time Capsule (2TB) as a basic/pseudo NAS, in addition to a target for Time Machine for two macs. My macs each have a 500 GB ssd. Neither are currently even half full, ...
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votes
3answers
32k 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 ...
2
votes
1answer
413 views

Can't delete Logical Volume Group on Fusion drive

I have a 2014 iMac Retina running OS X Yosemite and a 3TB Fusion drive. I am attempting to restore it from a Time Machine backup, but when I try to do so, I get the error message, "The disk can't be ...
0
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1answer
95 views

How can I encrypt a disk where diskutil cs convert reports “a problem”, leaves disk unreadable?

I'm trying to encrypt my Time Machine backup volume, but diskutil refuses, and leaves the disk unreadable (but repairable using Linux). How can I proceed? It's a Western Digital Elements 107C 3TB ...
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votes
1answer
66 views

Modifying bootcamp (link include) - Error when writing Iso on USB stick

Thank you for your tutorial for modifying bootcamp for Early 2008 MacBook Pro... Bootcamp - No ISO Option On my side, modifying Bootcamp to add the new option have worked perfectly, but i always got ...
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vote
2answers
288 views

Disk utility detecting error in single user mode, but not when disk utility is opened via recovery mode

I verified the integrity of my Macintosh HD (MacBook Pro 13" 2012, OS X Yosemite) with Disk Utility when I was logged in as a user and it reported this problem: Invalid volume free block count ...
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votes
2answers
275 views

Unsuccessful attempt to repair permissions with OnyX on El Capitan

I'm trying to execute the maintenance script in OnyX and I keep on getting the same errors at each pass: Permissions in the X11 folder are constantly being repaid (i.e. OnyX is showing that it ...
1
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0answers
33 views

Rsync for backups

I have gotten into the habit of using rsync to do my own backups of an encrypted volume containing my personal info onto an external hard drive. I did not use Time Machine, because I do not own the ...
2
votes
1answer
635 views

Mounting SMB network share from Mavericks recovery mode

I would like to be able back up my macbook on a weekly basis doing the following: boot into recovery mode mount a windows SMB network share use disk utility to save a disk image to the network share ...
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0answers
119 views

How to recover corrupted HFS+ partition in external HD?

I've got a 1 TB SeaGate FreeAgent Drive with following partitions: 700 GB ExFAT (labelled as FREEAGENT1) 300 GB HFS+ (labelled as FREEAGENT2) While moving data from 1 to 2, it got accidentally ...
3
votes
1answer
219 views

How to force a readonly volume to remount as read-write?

I have an external Firewire volume with some filesystem problems. One problem is that Disk Warrior can't fix these errors because there is not enough space left on this volume (in fact, it is ...
0
votes
0answers
123 views

Time Machine Backup Failing with Error 11

I've been trying to run a Time Machine backup for the last couple of days (OSX 10.7.5 and Porsche LaCie 2TB); however, it has been constantly failing. Console is producing the following crash messages ...
0
votes
0answers
217 views

How to mount a disk that was not ejected properly?

I am using OSX El Capitan 10.11.2 I have an external Western Digital of 1TB When I ejected I did not do with the properly way and now I am not able to mount I can see the disk here But when I ...
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0answers
226 views

External Hard drive are always readonly, even HFS+ and FAT32 format

I am running in to a peculiar problem. I have 3 external hard drives and few weeks back, I may have ejected one of them ungracefully. Ever since, they all are getting connected in read only mode. I ...
0
votes
1answer
316 views

How do I fix a corrupted USB drive on OS X?

I accidentally bumped the drive while repartitioning it and it unmounted. After that when I tried to repartition with Disk Utility I got Partition Failed with the error: Could not open device Now I ...
2
votes
1answer
31 views

When erasing media in Disk Utility, how can I change the default format?

Every time I erase my MicroSD card, I need to change the format from ExFAT to MS-DOS (FAT). Is there a way to change the default to the latter, or better yet, to default to the current format of the ...
2
votes
1answer
5k views

How to fix the error: “This disk doesn’t contain an EFI system partition”?

I get the following error and cannot start Bootcamp after accidentally deleting the EFI-partition of my main drive. This disk doesn’t contain an EFI system partition. If you want to start up ...
2
votes
1answer
239 views

Why is the “Encrypted” format not available in the list when erasing a USB flash chip in Disk Utility?

It shows up for normal, external hard disk drives. Is there a way I can force it to encrypt? The installed OS X is El Capitan.
1
vote
2answers
288 views

Partition map rebuild

I have an external hdd that doesn't mount anymore. I think I screw up with all the research I done and things I try. I have vital info on this hdd and I'm really afraid to lose it. I tried this: ...
0
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0answers
61 views

How to open a NTFS disk image file in OS X

I have a failing external HDD that I cloned to a working external HDD by making a disk image of it. Unfortunately, that cloned disk image file (and the original HDD) are of NTFS format. (I ignorantly ...
2
votes
1answer
7k views

Macintosh HD not showing up on disc utility

I am trying to do a clean install on my Macbook Pro 13" from 2011. Here is what I did so far: 1) Booted up on my USB Stick with Mountain Lion Installer mounted on it 2) Opened up Disc Utility and ...
2
votes
1answer
225 views

Expanding a Fusion Drive partition

I created a partition on my Fusion Drive when I first purchased my iMac running Yosemite, and I would like to now resize that drive ("Data" in the screenshot below), but Disk Utility doesn't allow it ...
3
votes
1answer
295 views

I erased the partition where Windows 10 was previously installed. How can I merge it with my OS X partition?

So I started up Disk Utility and erased my BOOTCAMP partition and set the format to OS X Extended (Journaled). This is how my partitions look like now: As you can see, I have a BOOTCAMP partition ...
23
votes
5answers
36k views

Resizing or expanding a CoreStorage volume

I bought a new SSD with 750 GB and made two partitions: 600 GB and 150 GB. The smaller one was thought to be a Bootcamp partition one day, but to date it was just another unused partition. When I ...
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0answers
105 views

How should I properly format my iPod nano 4th generation?

I've been the happy owner of an iPod nano 4th 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 ...
1
vote
2answers
217 views

How to create an ISO from a file (not a directory)

I'm trying to perform some testing on old platforms. In this case, its Fedora 1 (circa 2002 or 2003). The VM software (VMware and VirtualBox) can't handle distros that old, so the guests don't have a ...
3
votes
0answers
93 views

Should I be able to run disk utility on my Time Machine Backups?

Been having issues with Time Machine and backup so I ran disk utility on all my drives: iMac drive, iomega external HD and Time Capsule. When I run on Time Capsule I am getting a failure and this ...
0
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0answers
70 views

Mac HD unmounted and cannot be repaired. Can I still backup to an external drive?

My Mid-2012 MBP running on Mavericks has been slow lately--one day it crashed and I had to force shut down. When I turned it back on, it automatically booted to Utilities OSX without giving me options ...