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

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How to recover files by original filename without access to beginning of disk/partition

As a result of a dd user error the first Gigabyte was overwritten on a recent Macbook Air and it seems the beginning of all partitions are lost. Except for carving files using photorec or similar is ...
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1answer
1k views

Partition corruption, still can see files in single user mode, would like to retrieve files

The problem started after forcing the mac to shutdown. Since then, when trying to boot, it stays stuck at the grey apple with spinning wheel. I've tried a few generic things to be able to access my ...
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1answer
219 views

Installing OS X 10.7 on new HDD from DVD

I have a macbook A1181 model core2 duo3.1.3gb RAM. I lost my old HDD so I bought a new harddrive. Since I lost my old HDD I do not have the option to clone the old drive to the new drive. Mac OS X ...
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125 views

Can't create an encrypted disk image (permission denied)

I am trying to create a new blank disk image from the Disk Utility and when I select any kind of encryption and click on 'Create', it says it is unable to create the image because of 'permission ...
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1answer
167 views

How to kill the popup in OS X when a disk can't be ejected

With ZFS-OSX, sometimes when I try to force eject my HDD and it's failing, the following popup appears on my screen – floating on the top with all the buttons grayed out – and no possibility to close ...
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20 views

Invalid Leaf Node Count - causes?

I recently had the above error which I fixed using DiskWarrior (after unsuccessfully fiddling with fsck in single-user mode). I'm just wondering: What are the possible causes of an Invalid Leaf Node ...
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1answer
975 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 ...
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1answer
289 views

Unable to format pendrive, diskutil error

When I insert my USB Pendrive in my iMac i see this message: I tried to format it both with DiskUtility and with diskutil command in terminal but I get this error: iMac:~ User$ diskutil eraseVolume ...
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267 views

How do I (re)mount missing Firewire drives? Why do they vanish?

I have several Firewire drives that occasionally "go missing" even though they are connected to my Mac and powered on (the power light is illuminated). These drives do not appear in Disk Utility or ...
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2answers
3k views

Can't partition startup disk in Mavericks for Boot Camp

I recently upgraded my computer to Mavericks (I believe I have the latest version, 10.9) and I've been trying for 2 days now to install Windows via Boot Camp on my computer, but it always fails at the ...
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2answers
4k views

Disk Utility won't allow 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. Though I would Like to delete the partition that is left ...
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3answers
7k views

“Warning: SUID file has been modified and will not be repaired” after repairing disk permissions

Warning: SUID file “System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent” has been modified and will not be repaired. I keep getting this after running Disk Utility ...
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1answer
286 views

Get the UUID from a mostly dead hard drive?

I have a mostly dead internal hard drive in my '07 iMac. I've switched the machine over to an external FW800 drive but every now and then, on reboot, the mostly dead internal drive will mount on boot ...
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1answer
81 views

Disk Utility does not show OK message after Verify Disk

Rebooted and Verified Disk twice. There is no OK message and stops here: Is it a new behaviour under Mavericks, or something wrong? How can I fix it?
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92 views

Cannot partition hard disk although file system is OK

Here is what Disk Utility logs when I try First Aid → Repair Disk: Verifying and repairing partition map for “TOSHIBA MK3265GSXF Media” Checking prerequisites Checking the partition list Adjusting ...
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1answer
88 views

USB drives connected to hub disppearing

I've got four external USB drives connected to a 7 port powered dlink hub. All of them are externally powered, save for one of them. The hub is connected to a late 2012 Mac Mini. If I connect the ...
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1answer
1k views

Disk Utility not opening in Mavericks

I had used a Seagate external HD as Time Machine back up for a year or so. Since I got a gift of a better EHD now I wanted to erase all data in the old EHD. I thought a simple Format through Disk ...
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274 views

Unable to create new partition with Disk Utility on external drive

I'm trying to create space on an external drive to clone my mac as a bootable volume with CCC. With Disk Utility I cannot modify it for some reason (probably because the same disk is used with Time ...
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1k views

How to make bigger Macintosh HD partition

I installed OS X Mavericks Server as a virtual machine to ESX. I'm doing some testing and now I need more space. Macintosh HD partition is 50 GB and I have expand it to 100 GB total in ESX but I need ...
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2answers
3k views

How to Erase Hard Drive Mac System (this partition can't be modified/unmount)?

I want to erase a disk (Mac system) to resize OS X Mountain Lion to the max volume but I couldn't resize it nor unmount the other disk.
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0answers
76 views

Attempting to restore .img files to disk causes corruption

When I download .img files for writing to a CD or USB I've noticed a problem under OS X (including Mavericks). If Disk Utility recognizes the image and burns it, the resulting disk is corrupted. If ...
2
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1answer
193 views

Grow HFS+ partition at the end of harddrive without partition-manager-cd or moving to another drive

I've got two HFS+ partitions and would like to grow the latter one but neither disk utility nor the commandline diskutil allow that. I don't want copy the whole partition to another drive and then ...
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1answer
483 views

diskutil eraseDisk results in Error: 12: POSIX reports: Cannot allocate memory

I'm trying to format my usb drive that is partitioned with FAT32 by the following command in Terminal: $ diskutil eraseDisk JHFS+ UntitledUFS disk1 However, I get this output: Started erase on ...
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2answers
225 views

Delete and merge Partition

My MacBook's HDD has 2 partitions. One has OS X 10.8 installed, the other one 10.9. I'd like to delete the first partition and merge the free space afterwards to the 2nd partition. What's the easiest ...
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1answer
226 views

How to unmount a locked volume?

Sometimes, a volume refuses to eject because some program is using them. Sadly, Finder doesn't give the identity nor gives a way to solve the problem. So, how do you solve this problem in a clean ...
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256 views

Is Kext Utility a safe utility to use?

I've download Kext Utility from this site and I wonder if it is a safe utility to use and if there are any case of damage after using it. I have to install PS/2 driver in my Mountain Lion for using a ...
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1answer
190 views

How to restore Applications & Files from HD Backup (Migration Asst won't read it)

I recently had a problem with my MBP which wouldn't start up. After the chime it would shut down. I started using ⌘ cmd+R and ran Disk Utility. Had issues with my boot partition but no issues on my ...
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0answers
234 views

Disk Utility won't let me partition a disk

I'm trying to add a partition to my Macintosh HD using Disk Utility. However, whenever I try to do so, I get "the target disk is too small." I'm using OS X 10.8.5 on a Retina MBP, and there would be ...
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2answers
10k views

Disk Utility won't Unmount HD for formatting

I have two internal drives in my 27" iMac (10.8.5). An SSD system disk and a 1TB SATA drive. The HDD has been acting up recently, very slow performance, bad behavior etc. Tech Tool Pro and Disk ...
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2answers
1k views

What is the real working method of making a bootable usb drive?

Always when I need to make a bootable usb drive on a mac I struggle, I end up switching to windows because none of the below works for me, I'm using MacBook Pro: running sudo dd if=Debian.is ...
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1answer
119 views

Expanding a partition at the end of a drive to fill the entire drive

I have an external HDD connected to a Lion iMac (though I can use my Mountain Lion Air if it will make the process simpler) that was split right down the middle with two partitions. The first was ...
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3answers
4k views

Can't change folder permissions

I'm running Mountain Lion and I have a folder in ~/sites that has a red icon on the folder and I can't open it because 'access is denied'. What I've tried: Get Info > unlock with admin password, ...
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0answers
94 views

Broken FileVault Drive

I'm coming to you having a few issues with my old hard drive. Basically, my MacBook crashed a few days ago. It seems like my disk has some bad sectors and has started a kind of autodestruction ...
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56 views

10.8.5: Resume Disk Utility after a standby

Is it possible to resume a partition resizing operation after the computer went in standby? I've (sadly, without a choice) used my girlfriend's MBA to resize a partition on a disk. I was on battery ...
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1answer
334 views

RAID 1 with a Mac - how to avoid formatting one of the drives

I have an iMac with an external 2TB HDD. I recently bought a second 2TB HDD in order to build a RAID 1 (mirrored) with the two drives. The problem is that Disk Utility forces me to create a new RAID ...
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1answer
85 views

How can I wipe an encrypted volume when the password is forgotten?

I have encrypted disk volume that is in the way and the passphrase is gone. How can I erase the contents and reuse the disk space?
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0answers
47 views

Retina MBP won't recognize Archboot flash drive

I'm trying to install Arch on a flash drive. To do so, I'm trying to first get a bootable, "live" version of Arch on the flash drive I'm going to install it on later. I've followed the instructions ...
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1answer
584 views

How to reformat the latest iMac?

I need to reformat my work mac. My boss bought it about a month ago, so it's one of the newer ones that didn't come with an installation disc. It's running mountain lion and has a bluetooth keyboard ...
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1answer
167 views

Seagate 4TB, 3,5" / SATA III (ST4000DM000) and SK-3500 Super-S Combo

I bought a 4TB 3.5", SATA III Seagate Desktop HD and put it into a SK-3500 Super-S Combo. My iMac (late 2009) did, however, not detect the HD when I connect it. Since I cannot see it, I am unable to ...
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1answer
297 views

Safely destroying Apple Software RAID 1

If an Apple Software RAID (RAID 1, mirrored) exists and one of its members is failed. It is possible to destroy the RAID and keep the data on the functional disk intact? If so, how is this ...
2
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0answers
361 views

Time Machine and case-sensitive HFS

Time Machine defaults to formatting a new drive to Journaled HFS+ (case-sensitive), if you set up the drive from within Time Machine itself. However, my main drive (the one Time Machine will be ...
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2answers
689 views

SSD reporting incorrect amount of free space, not due to local snapshots

I recently created a file of just over 20GB and then deleted it shortly after, however my free space did not increase at all. I am using a 2012 MacBook Air with a 128GB SSD and I've had problems ...
2
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1answer
174 views

Very strange partition table: Missing a sector between Main and Recovery partition

So I have been trying to get Windows 7 on my machine using no DVD or USB (I have only an ISO to work with). I used various combinations of Boot Camp, Toast Titanium, Virtualbox / VMWare, Disk Utility, ...
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1answer
160 views

How do I Create a Macro or Shortcut to run a Command Sequence Terminal

The following was posted as an answer to a question of read/write difficulties on NTFS drive which worked perfectly. Thanks Codler. My question is, is there a way for a noob like me to create a ...
4
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2answers
3k views

How do I recover an “invisible” OS X boot option in BootCamp (running on a 2013 MBA)?

Summary Unable to boot into the OS X partition of a 2013 MBA which dual-boots OS X and Windows 8 via BootCamp. Could "Repairing Disk" via "Disk Utility" damage the working Windows 8 partition? What ...
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1answer
575 views

Merging partitions separated by Bootcamp

In the process of installing windows on my MacBook Pro, I managed to somehow partition the disk this way. Is there any way of merging the UNTITLED 3 segment with the Macintosh HD segment without ...
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1answer
128 views

Editing Partition

When trying to edit a partition on my hard drive, Disk Utility says: Couldn't modify partition map because the file system verification failed. So I booted into single-user mode and typed in: ...
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1answer
87 views

I can't boot into single user mode

A while back I partitioned my hard drive into two equal parts. I completely forgot about it and then realized that I only had half of my original drive space available. I startup disk utility and ...
3
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1answer
108 views

Does using “rm” command cause journaling corruption?

Some time ago I had some problems with my Mac drive, so I went to the recovery partition and used Disk Utility to check for problems. It reported a huge discrepancy between the journaled free blocks ...
3
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1answer
382 views

In Disk Utility, what advantages do “read/write disk image”s have over “sparse bundle disk image”s?

If I want a read/write disk image, then aren't sparse bundle disk images always the way to go? They start at 0 kb in size, and grow to accommodate whatever you add to them, and if you delete stuff, ...