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

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Disk Utility hangs prior to resizing partition

When trying to shrink the size of a partition, the period before the actual resizing happens (where Disk Utility says "Preparing to partition disk") hangs forever. I dug into Console to see what was ...
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6 views

Partition Table Overwritten by MBR for USB external storage

I was trying to make my SD card writable again on my MBP which I had my 1 TB external storage connected to my Macbook Pro. So I ran the command $ sudo diskutil eraseDisk FAT32 SDNAME-SD MBRFormat ...
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27 views

Problems restoring Windows to partition using Winclone

I installed Windows on my 2012 iMac a couple of months ago and it all worked out fine until my programs needed updates and I realized I had given my Windows partition to little space. I did some ...
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1answer
43 views

Time Machine Backup accidentally unplugged, can't repair

I accidentally removed my Time Machine backup without ejecting. It didn't show up in Finder after I plugged it back in and Disk Utility cannot repair it. Disk Utility recommends reformatting the disk, ...
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46 views

Restore Macintosh HD to its original partition configuration

I seem to have badly botched a Boot Camp installation of Windows 8.1. I used Boot Camp Assistant to create a 200 GB BOOTCAMP partition on my 1 TB Fusion Drive. I then rebooted and failed to install ...
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3 views

How do I change defaults for New Disk Image in Disk Utility?

Can I change the default options (dmg vs sparsebundle, encryption, size, etc.) for new disk images in Disk Utility? I haven't found the right com.apple.DiskUtility setting names for these (if they ...
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1answer
39 views

Erased hard drive, trying to Reinstall Lion OS X… HOW?

My mac wasn't loading past the boot screen (white, apple logo, spinning gear). So I CMND + R and went to disk utilities and ran Disk Repair. It could not repair. I tried everything. Even a an fsck ...
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2answers
65 views

external hard drive found only by disk utility, cannot eject or mount

I'm using a Seagate GoFlex that seems to have encountered some trouble. The drive does not appear on the desktop or Finder. I've double checked that Finder > Preferences allows for it to appear in ...
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3answers
41 views

How can I erase hard disk if SuperDrive is broken (OS 10.6.8)?

I have an old MacBook running OS 10.6.8 which I want to recycle, but its internal SuperDrive doesn't work, so I can't use the install disk to do it. I tried plugging in Apple's external USB ...
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1answer
98 views

How to merge two Mac partitions?

Recently I ran Boot Camp Assistant to install a copy of Windows 7. The "Partitioning Disk" process froze and I force quit it - I know, bad idea - and although I was left with a functioning Mac, I ...
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17 views

iMac hard disk partially erased - now stuck

My iMac, about four years old, started playing up badly - went from being very slow to not doing anything (grey screen at start up). I tried resetting PRam without success, and then started up in safe ...
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30 views

Warning “disk full” while more than 100 GB space free in disk utility

Why does the system warn me for "startup disk full" while "disk utility" shows there are still more than 100 GB space free? The warning is in the form of a pop-up dialog. Not sure how many ...
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3answers
64 views

Disk became full, had to force shutdown, now it doesn't boot

Don't know why I didn't get a warning about disk being almost full... It came down to zero free space and I couldn't do anything except force-shutdown it. I booted into Windows, deleted some files ...
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2answers
224 views

Restore Recovery HD partition from Yosemite downgrade

I recently got back to Mavericks from Yosemite, everything went fine. As I normally do, I checked my HDD with the Disk Utility and found some trouble, then I boot on recovery mode to fix my HDD. I ...
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1answer
18 views

Move data from 1 hard drive to the other

I have a bootable partition on an external drive with some old data that I want to move to a new external hard drive. The partition on the old drive is 500GB however theres only 320GB of data. So i ...
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37 views

Error while erasing my system disk in recovery mode

My macBook Air failed to start. I have the grey screen and when the progress bar is at 100% it shutdown. I tried 4-5 times with same result. I try in recovery mode pressing Alt key during boot. I ...
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34 views

How to 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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30 views

How to fix permissions with Repair Disk Permissions?

I just installed Xcode 5.1 and the latest round of updates. I followed that with a Repair Disk Permissions. For some reason, Apple installs its software with broken permissions. I then ran Repair ...
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2answers
191 views

Error-“Unable to write to the last block of the device.”

I am trying to setup a new hard drive into my Macbook Pro. However, I keep getting an error in disk utility that states, "Unable to write to the last block of the device." I saw another person was ...
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1answer
139 views

how can I delete a partition (coreStorage logical volume?) from the Terminal?

I finally understood why Disk Utility will not change the partitions on my HDD, even though I added the most recent one myself (maybe significant: to test Yosemite DP) with it. Now I see it says it ...
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2answers
68 views

Unable to determine the Mac OS X version on the targeted disk (-69831)

I recently moved my home folder to another internal HDD on my MacbookPro (early 2011 OSX 10.9.4). I'm having an issue where in-app file dialogs cannot display my new home directory or its contents. I ...
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1answer
17 views

Disk Utility - 3 Pass Erase

Just for my curiosity and knowledge, I read on a book that Disk Utility can erase a Volume/Partition by using different option of security. Among these options there is one called: 3 Pass Erase, ...
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1answer
24 views

MacOS Extended (Journaled, Encrypted) uses h/w encryption?

I have a LaCie 2big, connected via Thunderbolt 2. When I select as a disk-partition MacOS Extended (Journaled, Encrypted), does that uses some type of hardware encryption or is it all software?
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20 views

Disk partition interrupted

So I was partitioning my macbook's hard disk so as to install addition operating system. But as disk utility was in the process of partitioning, I closed the disk partition (for a reason) thinking ...
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32 views

Restore Bootcamp after deleting Ubuntu partition in triple boot

I currently have a Macbook Pro Retina on which I have triple booted Mac OS X Mountain Lion, Ubuntu 12.04, and Windows 7. I am using the rEFInd Boot Manager. I was no longer using the Ubuntu ...
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1answer
130 views

How do I get detailed SMART disk information on OS X (Mavericks or later)

I'm trying to get a detailed SMART status report on the drives in my Mac. I'm not talking about "Verified," I'm talking about the detailed report that's about 100 lines long listing all the vital ...
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2answers
77 views

How do I load the DiskManagement framework in single user mode?

From single-user mode in OS X 10.5, I want to run diskutil repairPermissions / but I get an error: Unable to run because unable to use the DiskManagement framework ... Is there a way to load the ...
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2answers
33 views

Why does my 2.5 TB HDD appear as a 2.2 TB HDD and a 300 GB HDD? How do I merge them?

I have a Western Digital 2.5 TB hard drive. (Model WD25EZRS) It's connected through an external USB dock to my iMac, running Mac OS X Mavericks. In Disk Utility there are two volumes, totaling 2.5 TB ...
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1answer
32 views

How do I copy files off a failed system partition without encountering permissions problems?

So I'm about to copy files off a system partition, and I'm afraid I'll have problems with permissions. A bit of background - OS X won't boot (looping progress bar) and Mavericks Recovery's Disk ...
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4answers
799 views

Unable to Resize Partitions [on hold]

I have recently created a partition on my macbook air running OS X 10.9, and this was to run install another OS instance (Yes, OS X 10.10 Yosemite, but that is an aside to the query I have) on it. I ...
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1answer
86 views

Creating a EFI partition

I have been having trouble installing OS X Mavericks and I think I found the problem. It told me I couldn't boot up with Macintosh HD, so I verified my disk and I got this error: This disk doesn't ...
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2answers
48 views

How can I mirror two macbooks [duplicate]

I have two macbooks. I want them to be exact copies. They have different CPUs, RAM, but they have the exact same drives. I work on both of them. I never work on them simultaneously. Can I setup ...
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216 views

Repartition hard drive with bootcamp on it

I currently have this setup on my Mac- OS X Mavericks 10.9.3, Windows (bootcamp) and a Recovery HD. My question is can I repartition my hard drive to have another partition, using disk utility (resize ...
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1answer
41 views

Incorrect amount of free space on 2009 Macbook

Recently, I've been noticing that my 2009 Macbook's storage has been plummeting. Despite cleaning my computer up, nothing seems to be working. I went to the apple store and we ran tests (which I ...
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0answers
52 views

Disk Utility Crashed whilst creating a Partition and I'm now missing hard drive space

Disk Utility Crashed whilst creating a Partition, and I now have ~100GB missing, which was the amount I had allocated to the new partition. The new partition didn't get created, and I now have 100GB ...
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1answer
24 views

How to fix broken partition process - lost space

I've started to partition my SSD in my MacBook Air (2011). Somehow it get stucked in this process for quite a while. I decided to stop it and restart my Mac. But now: My allocated space on my hard ...
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1answer
85 views

cannot boot. volume disappeared from boot option after Disk Utility (GUI) repair

I have a 13-inch MBP with the latest OS X version. Problem Yesterday, I went to the Recovery Mode and performed Repair on my boot volume. I was not having a problem, but I just wanted to verify and ...
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1answer
67 views

hdiutil: compact failed – Function not implemented

When compacting a sparse image with the hdiutil compact command, it fails with the message hdiutil: compact failed – Function not implemented.
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2answers
212 views

MacBook Air with Mavericks does not start up, no disk utility available

I have a severe problem with a MacBook Air. It does not start up, it hangs at wether a pure white background or white with the Apple logo. I tried to go into disk utility but pressing the option key ...
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38 views

Disk I/O error on a superdrive?

The hard disk of my late 2011 MacBook Pro 15" died and I replaced it with an SSD. I wanted to have more space, so I bought a 1 TB hard disk and put connected it instead the superdrive. The problem is ...
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1answer
39 views

Macbook pro, disk utility and external hard drive

I have a Macbook Pro running on Lion. My external hard drive is a Buffalo and used as data backup only, and is formatted to Macs. I have used the ext. hard drive for two years with no issues. I am ...
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2answers
69 views

how to create a 128MB HFS+ partition using diskutil

I have a ~ 500GB disk in my new Mac, and I would like to create a 128MB HFS+ (Journaled) partition using OS X, but when I tried to do this earlier today the smallest HFS+ partition I could create was ...
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45 views

Can't format USB Key

I've got an issue with my USB key, I can't write on it, nor format it... Here's what the erase option of Disk Utility outputs: Here's the Verify/Repair output: Verifying volume “NO NAME”Checking ...
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2answers
94 views

How to keep data from an old Mac to restore later

I have a new Mac, and I want to selectively move files over from an old Mac. I've sold the old Mac and need to ship it today, so what I really want to do is simply take a complete copy of the HD in ...
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1answer
1k views

Stuck in a boot loop after failed update to Mavericks, can't reformat HDD

I recently tried to upgrade a 2008 Mac Pro from Snow Leopard (10.6.8) to Mavericks (10.9.2) using the free upgrade available in the App Store. The upgrade seemed to go without a hitch until the ...
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1answer
38 views

Unable to increase partition size with subsequent blocking partition

I can't make my main Macintosh HD partition bigger. It's limited by the partition in the middle, which seems to be frozen, I can't move it down to make space for my main partition. Also I can't seem ...
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5answers
6k views

disk utility can't repair this disk. backup as many of your files as possible

I have an external hard-disk with a single Mac OS Extended partition. This disk stopped working couple of days ago. I tried to repair the partition with disk utility but no luck. The error message is ...
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1answer
28 views

Raid 0 - Why am I constantly losing data?

I have a Mediasonic 4 bay drive enclosure like this with four 3TB Toshiba HDD's attached to my hackintosh machine. The drives are in a RAID 0 configuration setup with Disk Utility. I've had this ...
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27 views

Finder stuck at starting

I have a big problem with my mac book pro 15" - maverick. Yesterday I was using my mac normally and I shutdown it normally. Today, I turn on and everything is fine until when I have to insert my ...
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5answers
364 views

How to identify and fix files with corrupted / inaccessible disk blocks

I have a late 2011 Macbook Pro, running Mavericks 10.9.2. Its sole HDD is a 750GB drive, formatted with Bootcamp. It's still running reasonably well, but in running a defragment pass on it, I've ...