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

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22 views

My macbook air wont let me erase my disk?

What the title says. I'm trying to delete all the data off my macbook air. I pressed command+r, went to disk utilities, selected my disk in the slot to the left, went to the erase tab. The "erase" ...
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0answers
12 views

seagate harddrive won't show in finder, appears in disk utility, can't mount

My hard drive seems shows up in disk utility but not in finder. All my finder preferences are set correctly. The partition does not seem to want to mount. Here are the errors found in the console ...
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1answer
470 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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0answers
18 views

Can't mount Macintosh HD volume - invalid content in journal

my 2TB external HHD has decided to fail to mount with the error "invalid content in journal" so i removed the journal using the terminal and tried to mount it - still fails ran verify disk on the ...
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1answer
24 views

DIsk Image shows larger size unmounted then when mounted. How to fix

I have an encrypted dmg (Mac OS Extended Journaled) read/write and it shows a size of of 768.46 GB unmounted but only has a mounted capacity of 665.72 GB. I think something may have been corrupted ...
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2answers
55 views

Unable to Partition a new Macbook Pro

As a brand new Mac user this might be my naivety or an issue with the OS. I bought a new Macbook Pro today and wish to partition the disk to allow Windows to be installed and Linux too. I was ...
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2answers
257 views

Disk Utility on Mavericks fails because “disk is too small”

I'm on mavericks and I am trying to delete a partition of an external hard drive. This is its schema Partition1: 50GB "MavericksBackup": Bootable backup Partition2: 187GB "Home Data": Absolutely ...
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1answer
4k 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
3k views

diskutil coreStorage in Lion fails to create a concatenated LVG, error -69886

I would like to create a logical volume group (LVG) with two physical disks. Issue The command: diskutil coreStorage create LVGNAME /dev/disk1 /dev/disk2 returns: Started CoreStorage ...
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2answers
15 views

How do I clone my drive to a external USB drive?

I have CarbonCopyCloner but it cannot see my new SSD in the destination section. The destination drive is a USB-attached SSD. How do I clone to this drive in CarbonCopyCloner?
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0answers
30 views

Data partly lost or hidden on external disk

I have an external disk connected to MacBook via USB. From time to time the system alerts that the disk is unreadable, but sometimes it seems to connect and I can browse it in Finder, and even open ...
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1answer
1k views

Yosemite Disk Utility: You may only split this volume in two

I just upgraded to 10.10- Yosemite. I have an external 4TB hard drive. These are the problems I see with Disk Utility: No more than two partitions are allowed. Changing the partition size I can ...
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1answer
162 views

MAC OS X refuses to mount the main volume Macintosh HD, saying that there's an “Invalid content in journal”

I have a problem with my MAC. Yesterday it got stuck while it was trying to connect to a Wi-Fi network, then, since it didn't respond I decided to turn it off using the power on/off button ('). When I ...
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1answer
54 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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1answer
67 views

Trouble with my partitions

I have some trouble with my partitions on my Macbook Pro. I created 2 partitions. One named "Yo" where I have installed Yosemite release. Another one named "Save" where I put all the stuffs I need to ...
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2answers
2k 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
32 views

How can I reclaim the partition's space from this shrunk volume?

I've already reverted the CoreStorage volume. And I've resized my "Macintosh HD" volume (by dragging it) and want to increase the size of my "Yosemite" volume. How do I reclaim the space (in grey) ...
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2answers
232 views

Cannot format MacBook Air SSD, stuck at waiting for disks to reappear

I have a Macbook Air with 128GB SSD and 4GB RAM with OS X Mavericks. I was using my Mac normally but suddenly Chrome got stuck. So I held down the power button and force-shut down the Mac. When I ...
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1answer
36 views

Do I have a Recovery HD?

I replaced my MBPs HDD with an SSD and put the HDD in the optical bay. Since then, I was missing the Recovery HD partition. That was still on Lion Now I have upgraded to Yosemite, and running ...
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1answer
29 views

Diff between diskutility and finder on free space

I came across this today : At first I was like : "Caching bastard." but no... The finder is right and the diskutil is wrong... Why ?
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0answers
90 views

Disk Utility won't let me create or resize partitions

My MacBook Pro 13" Late 2011 is running Yosemite. I am trying to install a Linux distribution on a partition of my hard drive. I used Disk Utility to resize the main partition on my hard drive and it ...
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5answers
19k views

Unable to Resize Partitions

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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0answers
65 views

Macintosh HD not showing in disk utility!

First a flashing file came up on my mac. When i go into disk utility's and it just shows disk0 and Mac OS X Base system. I've followed everything that I've found on the net: I've tried to start ...
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3answers
102 views

Does erasing Macintosh HD then restoring from Time Machine result in the HDD being reformatted?

I recently had a problem with the Macintosh HD that could not be repaired using the disk utility so I erased the disk (using disk utility) then restored from time machine (most recent backup) Does ...
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2answers
2k 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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1answer
632 views

Image files made with Disk Utility creates parent folder

I'm using OS X 10.5.8., updated from 10.5.2. which I installed from the two installation DVDs that came with my MB404 MacBook. I recently found my original 10.5.2. installation DVDs, which I thought ...
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2answers
4k 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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2answers
28 views

Cannot mount encrypted Time Machine

I've an encrypted Time Machine with the password saved on the keychain. Now, trying to plug in, it ask me the password and it's always wrong. I've checked hundreds of times and it also allowed me to ...
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1answer
344 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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3answers
1k views

Can't create partition on free space with Disk Utility [duplicate]

I have created new partition by selecting free space option and now I can't merge it or recreate it. I have tried to use iPartition to create a new partition on free space but it said I have no ...
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1answer
121 views

Incorrect free disk space on SSD after cloning Yosemite partition because of corrupt “.Trashes” folder

I replaced the Superdrive of my iMac with an SSD. Next, I trimmed down the partition of my existing HDD (2TB) as much as possible using Disk utility. This resulted in a 140GB partition. Then I used ...
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4answers
3k views

Unable to mount Time Machine partition

I have a WD external HDD which is plugged into my MacBook Air more or less all the time; it has two partitions one of which is my Time Machine disk. Just today I noticed that the hard drive is not ...
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3answers
555 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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1answer
79 views

Why is my Partition a folder?

I've set up a iMac12,1 with Yosemite (fresh) on a second partition. Then I've formatted my first partition (after i migrated my data from my old installation to my Yosemite installation on the 2nd ...
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1answer
147 views

Can you help me reformat my disk in recovery mode? Seriously botched Yosemite/FileVault installation

I have a mid-2011 macbook air. When I start up my computer, it automatically goes to recovery mode. I have a backup of my data, so I don't care what I have to do to get OS X working again. Disk ...
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3answers
2k views

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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3answers
10k 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 ...
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5answers
7k views

Forgot my password to a disk image (.sparseimage)

I'm in trouble right now. I used Disk Utility to create a sparse image and I cannot remember the password, when I created the file I didn't select to remember in keychain. Now, I try to enter the ...
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0answers
32 views

Correct Filesystem Setup?

Recently I did a fresh install of OSX Yosemite on my Macbook Pro. I followed these instructions to create a USB install drive, and I then used the Disk Utility app from that booted USB drive to erase ...
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1answer
720 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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1answer
146 views

Unable to convert dmg to encrypted dmg on Yosemite

When I try to convert a regular (internet downloaded) dmg file to an encrypted dmg (256-bit AES) using Disk Utility on Yosemite it gives me this error message: How do I get this to work on Yosemite? ...
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2answers
5k 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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1answer
2k 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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1answer
398 views

Resizing dual boot partitions in Yosemite

I have a dual boot Macbook Air with Yosemite and Ubuntu. I would like more space on my Ubuntu partition and need to therefore reduce the size of the Mac partition. I assume this will cause some damage ...
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1answer
1k 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
39 views

What is the proper way to save Application Information Before Reformatting My macbook?

My mid-2009 17" Macbook running Mavericks is running really slow and constantly freezes. I went to Disk Utility and ran "Repair Disk," but after about 3 minutes it said: "Disk utility can't repair ...
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9answers
30k 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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3answers
9k views

How do I fix my SSD after installing Yosemite and Enabling TRIM? No boot & can't erase

I recently upgraded to Yosemite, enabled FileVault and foolishly enabled TRIM (had no idea it wasn't supported). Upon restart, my machine gets the grey screen with the crossed-out circle of death. ...
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1answer
78 views

My SSD Drive has been converted to a Core Storage drive and cannot be erased/reformatted?

I put an SSD drive into my macbook pro. I should say that this drive hadn't been formatted and was a bootable drive with Yosemite OS on it, taken from another macbook pro... I booted the system up in ...
6
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1answer
6k views

Unable to format / erase hard drive

I have an external HD that died on me a while ago and I'm trying to see if I can format / erase it to start using it again. The disk does not show up in Finder but I can see it in Disk Utility. When ...