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

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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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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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1answer
18 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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292 views

Yosemite 'About this mac' displaying the wrong storage

I am having a strange problem where my 'About this mac' > ' Storage' is showing that I Have 470gb of Apps install on a 250gb SSD. I have used 3rd party disk scanners and they are all showing the ...
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1answer
384 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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2answers
2k views

What are the purposes and safety to enable the hidden debug menu in Disk Utility?

I'm primarily interested to know whether installation of Lion included the Recovery System. I understand you can enable extra formats and debugging in Disk Utility, using the following commands: ...
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1answer
36 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
153 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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3answers
22k 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
138 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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60 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
282 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
18 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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3answers
372 views

Exact clone of HD

I managed to broke something on my iMac's internal HD. I have now done a successful restore using DiskDrill, but just in case I want to make an exact copy of the internal HD. Not just some partition, ...
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2answers
480 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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124 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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0answers
181 views

200GB of lost space! Difference in file size between finder and disk utility

I have installed yosemite and I am trying to have a backup using time machine. Time machine gives an error that the external drive size is not sufficient. And here begins the adventure... I have an ...
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0answers
231 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
345 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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1answer
123 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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1answer
225 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
4k 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
119 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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2answers
4k views

Unhide Partitions via Terminal

Is there any way to unhide partitions that have been hidden by a third party partitioning tool on a Mac using nothing more than Terminal via a Mac OS X Boot CD or USB stick? Edit These partitions ...
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2answers
67 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
202 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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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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39 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
2k 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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209 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
58 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
91 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
36 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
217 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
50 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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1answer
107 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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2answers
168 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
5k 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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0answers
25 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
287 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
63 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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1answer
238 views

I can't create a second partition in Mac

When I go to my disk utility, my main hard gives me results like this It's showing capacity 499gb but only remaining 10mb. Now please see the second image What's happening with my Mac?
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2answers
147 views

After erasing 200 GB I need to repair it using the Recovery HD

I was cleaning my MacBook Pro, erasing all unused files I had on it. After that I decided to erase the free space, so I will have all my files organized and cleaned the "used space". After that I ...
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0answers
319 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 ...
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0answers
140 views

Is there a way to manually repair a CoreStorage volume?

I was playing around with CoreStorage on a test disk and used the undocumented commands cs addDisk and cs removeDisk. The addDisk command worked just fine and was able to expand a logical volume ...
2
votes
1answer
640 views

Is my SATA cable damaged?

Macbook Pro Mid 2012, original SSD. TLDR; Why could I clone my unmountable drive from an external enclosure but not internally? My SSD broke down a few days ago. It was detected, but I was unable to ...
2
votes
4answers
3k views

How to delete partition disk0s4?

A while ago, I dual booted with ubuntu linux and followed a tutorial on youtube to do so, but later I wanted all of my hard drive to be for osx, so I deleted the ubuntu partition, but now I am left ...
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1answer
75 views

GPT looks valid. Diskutil sees empty disk

External 3 TB disk. Stopped working after a power bump. GPT reports as follows: bash-3.2# gpt show /dev/disk6 start size index contents 0 1 PMBR ...
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1answer
50 views

Bootcamp Partition Creation Failure

I wanted to install Windows on my 2011 Macbook Air running 10.8. I had approximately 40 GB of a 120 GB hard drive free and I set Bootcamp to create a 20 GB partition for Windows. Halfway through the ...
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1answer
5k views

External HDD can be seen in Disk Utility but not in Finder

I've been using my external HDD a lot of times before on my Macbook Pro 13" OS X version 10.9.5, but it doesn't seem to appear in my Finder anymore. It can be seen in Disk Utility, though. Can anyone ...