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

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4k views

How do I force a partition and format on a USB key in OS X Mountain Lion Disk Utility or from CLI diskutil?

I have a brand new Memorex TravelDrive 64GB USB disk which is being troublesome. It's formatted FAT16 on MBR, which is not so nice, and I'd like to put it on HFS+. I've tried to do this through ...
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94 views

Oops, I broke my MBR, what do I do?

I installed Mavericks a couple weeks ago and discovered to my dismay that last night, I couldn't boot into my windows install via bootcamp. I'd encountered this problem before, and without entirely ...
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0answers
282 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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0answers
96 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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0answers
379 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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345 views

How do I write-protect a partition of a USB drive on OSX that can work cross-platform?

I bought a bunch of USB sticks that I want to give as a gift to friends and clients, with some files on them. I'd like to have the files non-erasable (though I realise they can format the drive, I ...
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0answers
156 views

MacZfs with encryption on os-x

I have followed these steps for setting up zfs (maczfs 74.3.0, OSX 10.8.3) with encryption. Everything works fine, till I restart the computer. After the restart, diskutil informs me that the file ...
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205 views

How do I format an encrypted Integral Secure Key?

I just bought an Integral Secure Key from the Apple store but am fed up with having to use its own software just to transfer files to it as it does not appear as a normal USB drive in Finder. How can ...
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26 views

Can't mount (Core Storage) encrypted volume anymore

I use the following setup: SSD: System Internal HDD: Data (Documents, Music, etc.) Both disks are encrypted via the Core Storage utility. It seems I can't mount the "Data" disk anymore. I wanted ...
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18 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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38 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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42 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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65 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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62 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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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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362 views

Error occurred while removing boot camp partition with Boot Camp Assistant

While attempting to remove a boot camp partition with Boot Camp Assistant I encountered an error. Boot camp assistant gave me an error message along the lines of "An error occurred while restoring the ...
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0answers
27 views

What to do if repairing one disk made the other unrecognized?

Originally I had two drives, an HDD and an SSD (my boot drive). The HDD had a 100gb partition on it that used to have windows installed on it, but that partition got locked and became unusable. When I ...
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17 views

Can you change the volume name when creating a disk image from an optical disc in disk utility?

I know how to create a disk image from an optical disc using Disk Utility. The problem is that I need to change the volume name for the resulting disk image.
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239 views

Bootcamp system operating missing error after resizing partition

I resized my partition to increase my bootcamp drive few months ago on Disk Utility on Mac and after that I decieded to have more space on Bootcamp partition so I resized it again by set new size for ...
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164 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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33 views

Can I enlarge a RAID10 with Disk Utility?

I have a 4TB RAID10 (4x2TB disks) created with Disk Utility. I also have 4x4TB spare disks. Can I enlarge the RAID10 to 8TB (4x4TB)? This post suggests that I can break each mirrored set, and ...
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21 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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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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77 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 ...
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140 views

Increased the Size of Bootcamp Partition but Winclone Restores Old Size Partition

I followed all documented steps to increase the Bootcamp partition size on the Mac OS 10.5.x. I used Winclone, Disk Utility and Bootcamp Assistant to perform this operation. In short, I cloned Windows ...
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410 views

RAID 1 array degraded, now not being recognized by OSX

I've got a pair of Seagate 3TB HDDs in a mirrored RAID 1 array using a Vantec NexStar MX two-drive enclosure. The setup has generally worked fine for the last four months, but lately I've noticed that ...
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291 views

MacBook Pro Mid-2009 13 inch does not recognize replaced hard drive

As the title states, I recently got a used Hard Drive from another MacBook Pro and installed it into my MacBook. The problem, is the laptop will not recognize it at all. The old hard drive just goes ...
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269 views

Why do external hard drives stop working under very specific conditions?

I have a mid 2011 MacBook Pro 15" running Lion. I have seen this behavior across 3 different external hardrives, with varying manufacturers (2x Seagate, 1 Western Digital), different file system ...
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387 views

“Invalid key length” - corrupt partition after power outage?

I recently lost power overnight with my computer up and running, external hard drives plugged in, and in the morning my login screen had the "Device Removal" error as if I unplugged the disk without ...
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144 views

Find Time Capsule HD Specs

How can I find out the specs from my Time Capsule hard drive? It doesn't appear in Disk Utility (a mounted disk). More specifically, I'd like to know the manufacturer and model, much like the System ...
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2k views

Disk Utility Error Message - Missing EFI + MediaKit

Previously setup was with 2 partitions, one for normal use while the other had the Lion Install ESD on it, used when I installed some time ago. The other day my machine suddenly shutdown and when I ...
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766 views

Migration Assistant fails to recognize a Time Machine disk (itself migrated using Disk Utility)

So I outgrow my Time Machine disk. I listen to the advice (repeated in multiple places) that one can simply use Disk Utility's Restore tab, select the old time machine disk as source and the new one ...
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10 views

Used DiskMaker to create bootable USB, got error 10600, USB won't mount

I tried creating a bootable USB for Mavericks. Downloaded and used DiskMaker X. Got an error, -10660, and the app closed. Now my Mac won't mount (or recognize) the USB drive. It doesn't show up in ...
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13 views

Find mount points from network mounts in Disk Utility

I know lots of ways to find mount points for my mounted drives, both locally or on the network. This question is specifically about 'Disk Utility'. Disk Utility does a fine job of telling me info ...
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0answers
9 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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64 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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0answers
5 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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42 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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37 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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48 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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0answers
47 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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0answers
60 views

Why does the diskutil shows I have two local hard drives?

I was trying to get my NTFS drive to work today and I discovered that the diskutil thinks I have two local hard drive. This phenomenon is not occurred on my Macbook Pro. Do anyone know why? Here is ...
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75 views

Disable auto mounting drive in OS X

I have two hard drives inside my MacBook, and I only want one to be auto-mounted at boot. I'm running OS X 10.7.5. I tried creating /etc/fstab with this line: ...
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0answers
32 views

Equivalents for genisoimage and qemu-img on Ubuntu

How do I achieve the same result on OS X 10.9 as I do on Ubuntu with commands: $ genisoimage -output init.iso -volid cidata -joliet -rock user-data meta-data and $ qemu-img convert -O raw disk.img ...
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0answers
46 views

Can't accees a NAS (LaCie type) external drive after booting from a USB

I would like to make a dmg image of my drive and store it in a NAS drive - one that is accessed only via the local network. When working normally, I can access the drive, but I am not allowed by the ...
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59 views

Diagnose if corrupted volume is due to hardware problem

This morning when turning on a Mac laptop, it suddenly announced that an external backup disk (which was connected overnight) "can't be repaired". Disk Utility also says: Disk Utility can’t ...
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97 views

Files seem corrupted after transfer from usb drive

I recently switched Macbook so I transferred the files from my backup to my new computer, but it seems most of the files are corrupted. A few mp4 files aren't corrupted but everything else is! ...
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78 views

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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158 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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101 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 ...