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

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Apple MacBook Air mid-2012

A few days ago, I got my Macbook Air battery changed at an Apple store. Since then, about once a day, I've had a "kernel panic" crash, which seems to happen randomly while I'm working. (I've never ...
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17 views

New Pro can not create netboot set in deploystudio

I tried creating new DeployStudio NetBoot Set. For some reason after it starts creating it, I get the error "DeployStudio NetBoot set Creation Failed! An error occurred while trying to create the ...
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1answer
12 views

OSX partition failed

I stumbled upon errors when I tried to partition my HD for an ubuntu partition. First it kept saying Partition Failed: Filesystem Verification failed That problem did disappear after a while. Probably ...
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4answers
66 views

I can't shrink my OS X Yosemite partition [duplicate]

I recently reformatted my machine and am trying to shrink my OS X partiton to make room for a linux partition, following instructions at http://www.makeuseof.com/tag/install-linux-macbook-pro/ . I am ...
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30 views

Formatting & partition problem

Today I ran into a big problem: I was trying to make a bootable OS X thumb drive with Unibeast but haven't been able to format or partition it. The error shown when i try to format or partition in ...
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35 views

How do I repair a hard drive that was being written to while my MacBook Air crashed? (Drive will not mount)

My external backup drive will not mount. I have tried to mount it in Disk Utility via the app and the command prompt but the attempt times out. Any suggestions? I backed up my HD the day before ...
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18 views

How do I transfer unallocated space from volume A to volume B?

Let me just clarify it with the picture below. As you can see, there is much free space on the 'SSDaeffer (1)' partition, but as this was my OS X Beta partition, I want to transfer that free space ...
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26 views

how to mount internal hd after booting with external drive?

I am running macosx 10.6.3 and trying to mount/access the internal hd through diskutility: it does not show up here. I tried this: ...
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2answers
55 views

Resize FusionDrive to fill empty space?

Context: I wanted to install Windows 8 onto my Mac by repartitioning my FusionDrive. Using the partition BootCamp provided didn't work, so I found a "solution" on Apple forums to create empty space ...
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1answer
37 views

Disk space lost after quitting disk partition

My MacBook Pro came with a 500 GB hard disk, and I used about 250 GB. I was trying to get a new logic partition using the OSX disk utility, and then my Mac Book Pro froze and I had to quit the Disk ...
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15 views

Rename the Disk, not the partition [duplicate]

I recently bought a MacBook Pro 15" of mid 2015. It has a SSD named 'This mac' but I want to rename it. I have two partitions, one called 'Macintosh HD' and one called 'Windows HD' since I have a ...
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2answers
54 views

Move Bootcamp to external drive - restored, fdisk - still not recognized as bootable!

I want to copy my W7 Bootcamp partition to an external HDD, and be bootable of course. It is currently functioning fine alongside Yosemite on a different HDD. DiskUtility Restore works... I marked ...
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1answer
12 views

Can a disk's catalog directory be recovered after a Quick Erase?

A disk's data directory seems to me to be the most vulnerable Achilles's Heel to protecting data. With the 2 clicks of an accidental quick erase and format via Disk Utility, the roadmap to ...
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49 views

Create Iso from directory

I'm trying to create an iso from a directory on my computer. I've tried using both the Disk Utility method and just Terminal but I keep getting Operation not permitted errors regardless of my method. ...
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1answer
49 views

Recovery HD Is not showing up. Is it because of FileVault?

I have a problem. On my mac, when i start and hold the ALT key, or the Command-R Key, then it doesn't boot into Recovery HD or even show it. I need it to repair, mount etc. my disk. I tried disk ...
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1answer
19 views

Continuous volume shows too much available space

I have a continuous volume of two identical SSD drives. 2 terabytes, 1.92 terabytes in practice. I plugged it in via USB today and finder and disk utility show that all the space is available. ...
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1answer
40 views

repair disk - unmounted encrypted disk partition

In Yosemite 10.10.2 after verifying my startup disk in disk utility I got this message... "This disk needs to be repaired using the Recovery HD. Restart your computer, holding down the Command key ...
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1answer
38 views

Seagate Slim 2TB Not Recognized

I recently purchased a Seagate Slim 2TB external HD. I connected it to my 2010 iMac, formatted it as exFAT, and moved a bunch of files. I don't remember exactly what process I went through with ...
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33 views

Mac OS X Mavericks starts with question mark

Yesterday, I was using my Mac OSX and some applications were using a lot of memory. It wasn't possible for me to finish my Mac correctly and I decided to turn off the computer with the On/Off button. ...
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1answer
62 views

macintosh HD missing from Disk utility

I've purchased macbook pro 13 retina, wanted to migrate data from my mba. So I formated drive, installed spanking brand new osx from recovery disk. And launched migration assistant. Migration ...
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1answer
15 views

How do I recover a password from a custom disk?

I made a folder with some content into a disk image and assigned it a password. I unfortunately have forgotten the password and cant access it. Any work around solution to the problem?
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66 views

MacBook not able to boot using OS X (Yosemite) after partitioning the Macintosh HD (hdd) while installing Kali Linux

I tried to partition the HDD using GParted but it didn't work out. Maybe because I messed up. So after cancelling the whole process, I rebooted my laptop. When I tried booting through OS X, it did not ...
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2answers
92 views

How to Create Images with Yosemite

I have a Mac Mini configured just the way I like it with 10.10.2 installed. I need to deploy that to a bunch of other computers around campus. The usual process for me in the past has been to use an ...
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0answers
70 views

Can't erase unmountable external HD

My external HD isn't mounted and can't be repaired by Disk Utility. However, I'm also unable erase the disk: $ diskutil list disk2 /dev/disk2 #: TYPE NAME ...
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1answer
56 views

External Drive showing only in system profiler

I have had a 1TB Western Digital Ultra external hard drive for nearly year. Out of nowhere it will not show in disk utility but it does show in system profiler. I have a Macbook pro mid 2012 running ...
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1answer
553 views

Disk Utility message “Updating boot support partitions for the volume as required”

Finder crashed on a external drive which caused an abrupt eject. I rand Disk Utility over the drive and the operation finished with the message: Updating boot support partitions for the volume as ...
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1answer
86 views

Hard drive no longer accessible

This is a 4 TB hard drive formatted in Mac's Disk Utility as a single non bootable Exfat partition with the drive letter G. It worked fine before I decided to make a clone drive of my C bootable ...
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1answer
46 views

Force stuborn drive to unmount

I have a single partition disk whose filesystem will not mount properly. I don't care about the data and I would like to try reformatting the disk but I keep getting errors related to a failure ...
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0answers
18 views

Brand new 15in retina

I bought the mac then hooked up Time Machine and started restore to Mac HD. All was fine until the end when the backup from on 6 minutes to go for a couple of hours. No progress at all. So after ...
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1answer
65 views

Resizing Macintosh HD partition to use free space

I recently deleted a partition and have 60GB of free space. I would like for my main partition to use that, but whenever I go to resize it, I get the error "You can’t perform this resize unless it has ...
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27 views

What to do after mistakingly shrinking disk in Disk Utility?

I only had 1 volume on my hard drive. I tried to shrink it with Disk Utility - thinking it would resize the disk and the other space would be available to create another disk with. I didn't add any ...
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1answer
295 views

How to fix the error: “This disk doesn’t contain an EFI system partition”?

I get the following error and cannot start Bootcamp after accidentally deleting the EFI-partition of my main drive. This disk doesn’t contain an EFI system partition. If you want to start up ...
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95 views

Restore on new drive: Time Machine versus “Restore” via Disk Utility

I am about to install a new 240GB OWC Mercury Electra 6G (6Gb/s) SSD into the main drive bay of my MacBook Pro, moving the original Apple-installed 120GB 3G (3Gb/s) SSD into the optical bay using an ...
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1answer
29 views

Backing up a RAID experiencing I/O issues

I recently began working for a company that has an OS X Server with a PROMISE Pegasus Thunderbolt RAID (RAID 5) attached as a file server. Within my first couple of days, it became apparent that users ...
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1answer
78 views

Problems with target disk mode, HD does not show in Finder/Desktop (only in Disk Utility)

I have a MacBook Pro which goes straight to Disk Utility when I try to start it (it totally froze and I forced it off and on). And no luck in repairing the hard disk (Disk Utility can't repair…) I am ...
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3answers
253 views

Mac OS X doesn't recognize hard disk

I replaced my CD drive with a Western Digital 750GB hard drive using the iFixit guide. My Mac for some reason throws error on any interaction with the hard drive, for example on disk utility when I ...
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0answers
40 views

Partitions shows it is 2GB when it is actually 120GB

After messing with the partitions to install Ubuntu, the hfs+ partition which I use for my user data went from 130GB to 2GB (OSX is on a separate partition). Disk Utility shows this partition as ...
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1answer
41 views

Partition of harddisk lost/unusable

I'm using OS X Yosemite - version 10.10.2. I have 1.12 TB fusion drive on my system. Recently I wanted to make a partition on my system, while making the partition on the system using disk utility ...
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1answer
16 views

How to rename disk indentifier?

I created 5 partitions on my portable-drive via DiskUtility. $ diskutil list disk2 /dev/disk2 #: TYPE NAME SIZE IDENTIFIER 0: ...
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1answer
86 views

Is undoing Yosemite's CoreStorage conversion dangerous?

I tried to make an 8 GB partition on my hard drive so I could make it into a bootable drive, like Recovery HD but without the need to redownload the OS, but for some reason Disk Utility wouldn't let ...
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1answer
40 views

Remove partition and restore the space without erasing

Time ago I split the hard drive (500gb) in two partitions (250 each), now I don't need them anymore, so I have first erased successfully one partition and now I have still the second one (Mac HD 2) ...
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2answers
51 views

How does disk utility work while the system is live? (e.g. partitioning/resizing the OSes partition)

How is it that Disk Utility allows you to resize the partition that OS X is botted from live, while the OS is running? Can there be problems doing this? I would have thought that booting into recovery ...
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1answer
127 views

Why does Disk Utility show one “Macintosh HD” as a logical drive and another that says core storage physical volume

I am trying to figure out why I have 2 Macintosh HD Drives Appearing in disk utility. One of them i can mount and shows it as being a logical drive and the second one i can't mount but it says it has ...
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2answers
95 views

Is my hard drive already dying?

Although everything is working fine with my Macbook Air from Mid-2013, I have a few errors that bother me. Here they are: Onyx says this: The SMART status was not verified because it is not ...
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1answer
135 views

How do I regain unaccessible free space after a failed Boot Camp install on a non-Fusion drive?

Firstly - I know this has been answered, but I am hoping for a more broken down answer, as I am not quite so technically minded, but I can follow instructions! So in summary I have tried to install ...
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0answers
15 views

Diskutil can't add drive to mirror

bash-3.2# diskutil appleraid add member disk3 disk8 Started RAID operation on disk8 LookingGlass Unmounting disk Repartitioning disk3 so it can be in a RAID set Unmounting disk Can't write the RAID ...
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1answer
66 views

Flashing folder icon appeared once after changing Macbook hard drive

About 2 weeks ago, I updated my late 2011 Macbook Pro hard drive to a Crucial MX100 solid state drive. The drive installation and data migration went fine with no issues, but today I found the ...
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1answer
123 views

Trying to boot up on Mavericks USB Install Drive, receive prohibited sign on screen

I have a late 2011 Macbook Pro and I had Mavericks, which ran just fine, but I upgraded to Yosemite after hearing some good reviews. I didn't back it up in time machine. It made my laptop extremely ...
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1answer
58 views

Replace Recovery HD with a “bootable drive” formatted partition?

A while ago, I had the idea to use the bootable Mac OS X USB drive-making procedure on a hard drive partition, so that I could basically have a version of the “Recovery HD” that doesn’t need to ...
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62 views

My Macbook Air doesn't recognize my USB

I've always used my USB on this computer. The only issue i would have is that it wouldn't always appear on screen, but i would just eject it and put it back in and it would all be ok. Today for some ...