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

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Drive name red in Disk Utility: Core Storage Drive offline. How to bring back?

Yesterday, my mac wouldn't boot up. When I restarted, I could get the whole way to the User login screen. No matter what user I chose, the boot bar would get about 1/3 way finished and I would get ...
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1answer
25 views

Format External Disk in FAT, NOT FAT32

I have an external device which mounts as an external drive and which I must format in FAT, not FAT32, for use elsewhere. Is there a way to do that from Snow Leopard?
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61 views

Disk Utility: Invalid Disk Label @ cksum mismatch

I have a WD external hard drive. I've been running the routine tests to make sure all my stuff is safe lately. In Disk Utility, I did Verify Disk on both the disk itself as well as the main partition, ...
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1answer
45 views

Interesting partition Map with missing HD space

I have the latest generation Macbook Pro running Yosemite, I bought this computer used I don't know if the last person attempted to install linux or what the story is but I believe my partition map is ...
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1answer
16 views

Can not reinstall Windows7 (using Boot camp) after i've removed Bootcamp partition via Disk Utility

I've removed Windows partition (might be label as Bootcamp) using Disk Utility. and after that i found that i made some mistake because in actually i should remove it via Bootcamp Assistant. What's ...
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1answer
28 views

Why do I have /Volumes/Storage Drive?

In Terminal, I noticed I have /Volumes/Storage Drive. On my mac, I have no drive named Storage Drive. Furthermore, no Storage Drive appears in Finder or Disk Utility. When I cd inside Storage Drive ...
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1answer
52 views

OSX Yosemite can't resize partitions?

A few weeks ago I installed OS X yosemite.I did it on the standard partition, but I had a dual-boot with ubuntu. I realised that the ubuntu boot was gone so I tried to redo it. But in disk utility, ...
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1answer
27 views

Macbook Lion Recovery Disk Utilities cannot detect newly installed SSD

I just installed the SSD and I cannot detect the SSD in Disk Utilities of the recovery disk. Even trying to restore from time machine backup it cannot find any disk it can restore to. I am restoring ...
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1answer
81 views

Yosemite freeze at boot - no safe boot + I/O error

Yesterday everything was fine but today my macbook freeze/stuck during the boot. I've done this: check + repair permission (nothing changed) check + repair disk (nothing changed) tried safemode ...
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1answer
29 views

Restore a lost partition from degraded software mirror RAID

I used to store my valuable files on Apple software RAID (mirror). Recently one disk has failed and the mirror became degraded. I rebuilt the mirror using new drive, following this guide, but seems ...
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16 views

Can't unmount Macintosh hd with Mavericks with lion bootable USB

Hi I'm trying to revert back to lion after using the sixty four on thirty two method to install Mavericks on a mac pro 1,1 but for some reason when I boot from a USb with the lion installer I can't ...
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1answer
48 views

“This is a startup partition. You can't erase it” On Disk Utility

I want to expand my Windows partition. I saw all the tutorials on youtube and they said to drag the drive on the corner. However, the Disk partitions doesn't have a drive for me to drag and said ...
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2k views

OS X Yosemite installation error: File system verify or repair failed

My Mac has been running fine until I decided to upgrade to OS X 10.10, Yosemite. When it is installing I get the message: File system verify or repair failed. I clicked the restart option to ...
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1answer
82 views

"You can't resize the partition on this disk because it uses the Master Boot Record partition scheme [duplicate]

I am trying to get rid of one of the volume ("mountain Lion", the second from the top) of the partition of an external hard-drive. In disk utility I get what you can see in the pic, namely it does not ...
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11 views

Trying to Partition My Macbook from mid 2009 running osx 10.5.8 to partition 10GB

Ive been trying to partition my hard drive for a very long time and the only time it will work is when i partition a 1 gb section i want a 10 gb section. My total hard drive space is 111.3 GB and i ...
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3answers
57 views

Partition problem after HDD to SSD swap

Recently decided to replace my nearly full 500GB HDD with a 1TB SSD to breathe some new life into my mid-2010 Macbook Pro. I used a toaster-style drive cloner (Dyconn Dubbler) to do a sector by sector ...
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43 views

Macbook Pro OS X 10.9 Partition problem

So I bought a MacBook Pro mid-2009 with Mavericks installed (post-leasing) and this is my first MacBook. The HD was partitioned in three partitions C, D, E - I didn't want that, so I read a little, ...
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1answer
28 views

Getting loads of Open error 5's when using Terminal to repair permissions

My GF's MBP running on Mavericks broke down 2 days ago. First I tried to copy the contents of her HDD to an external HDD but got the I/O error time after time. Then I tried all the basic things like ...
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1answer
72 views

Failed to make bootable USB drive and now I can't even format it

I want to do a fresh install of Yosemite and I got a brand new 8GB flash drive and I followed this tutorial. I formatted the USB drive and was copying the Yosemite installer, however I got the ...
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39 views

Newbrand Mac with Yomsemite, 1TB HDD, limited to two partition

I just bought a new Mac , i started to make few partitions as i used to do in the past. I noticed i am not able to have more than two partition :( It says : "you may only split this partition into ...
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1answer
225 views

OS X Yosemite Hard Disk Errors even after Repairing them

Basically, I do a lot of C programming (for class) so I use gcc a lot on my mac. Recently since two days, whenever I ran it, the entire computer is getting frozen, and a force restart is necessary to ...
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53 views

How to Fix Disk Utility Getting Stuck on “Verifying storage system”

Okay, had a brief power outage today that shut down my computer and external drives, so I figured I should run a quick disk check just to be safe. However, when I run try to verify with Disk Utility, ...
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75 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
68 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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60 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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2answers
641 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
24 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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1answer
47 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
84 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
41 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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1answer
72 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
35 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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184 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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168 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
130 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
33 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
219 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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1answer
859 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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1answer
88 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
198 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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34 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
34 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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1answer
45 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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1answer
225 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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1answer
600 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
96 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 ...
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67 views

Unable to utilize “Free Space” partition

On my SSD disk I have one partition for Mac OS X Yosemite and one partition for Windows 8.1. I needed more space on my Mac OS partition and therefore a decreased the size of the Windows partition from ...
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99 views

Deleted partition with Disk Utility, can't add new one

I had three partitions on my 750 GB HDD on my 2012 MacBook Pro top end: - 'Macintosh HD' at 646.4 GB - 'Recovery HD' at 650 MB - 'disk05' at 100 GB Earlier I had Ubuntu 12.04 installed on disk05, ...
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1answer
48 views

Insert third partition in previous 2-partition setup

I've read a few of the articles around, browsed the net for a while, but was unable to find a solution to my problem. I have an MBP with 1TB Flash which is split by 50% into two partitions. One ...
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105 views

Disk Utility won't let me remove partition. No matter what

Since Yosemite was released this month, I decided to inaugurate it by downgrading from Mavericks to Snow Leopard. I decided to back some files up in a partition (on Mavericks) before wiping the main ...