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

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Volume encryption takes *hours*, is it possible to fix it?

I'm encrypting an empty volume. Internet articles say that is must be almost instant — but it's not the case. It's probably doing a kind of wipe (securely erasing free space), but if I really don't ...
3
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2answers
269 views

How to convert a DVD to ISO?

On Mac OSX 10.9, how do you convert a DVD into an ISO that I can use with players such as VLC. I wish to achieve this without buying a program. Steps I have tried: Downloading Mac app Burn. It ...
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0answers
29 views

Extracting files off sparsebundle with read errors

I have a large sparsbundle disk image on a drive that is reporting read errors. I am able to mount the image although it can sometimes take several minutes. I would like to copy any readable files ...
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1answer
158 views

Where is my disk space going?

My available disk space seems to «vanish» magically. OmniDiskSweeper tells me that 69.5 GB data is on my hard drive, but how come Finder and Terminal (and OmniDiskSweeper's drive list itself) tell me ...
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1answer
148 views

Can't format o repartition any USB or Flash Drive

I am trying to format an SD card and an USB flash drive. When I use the Disk Utility application I receive the following message: "Couldn't open device" I also tried via terminal and the message I get ...
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1answer
108 views

Reformat a Partitioned Mac OS Extended External Disk?

One of my backup disks is full. How can I Erase & Reformat the drive? I use Yosemite OS. The External Hard Drive was formatted as Partitioned Mac OS Extended (case sensitive, Journaled, Encrypted ...
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1answer
266 views

Cannot boot Mac Mini with striped RAID 0 set

Today we could not get one of our machines running with 10.9 and RAID 0 which stripes the data on the boot volume. After several hours of doing the 'standard' tasks like fixing permissions etc, we've ...
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2answers
64 views

how do i remove Ubuntu from my macbook? [closed]

i just bought a Macbook from someone off of Craigslist but it has Ubuntu software on it, but I want the regular Apple OS. how do I remove Ubuntu without damaging the computer and its files?
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2answers
40k views

Cannot Unmount Mac OS X Base System Disk

My Mac running Lion was being slow, so I was decided to reinstall OS X. I don't have any Time Machine backups. Everything went file, but in the middle of the installation, it got stuck, and later the ...
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1answer
738 views

Mac Mini can't unmount disk in Recovery Mode

I need to wipe my Mac Mini and reinstall OS X. Booting into recovery mode (holding command+option+R), I try to erase the disk in Disk Utility but it says it cannot unmount the disk or gets stuck on ...
2
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0answers
296 views

Is it safe to convert Core Storage partition to HFS+?

I just got my new Macbook Pro, I tried to make two new partitions using Disk Utility but I could only create one. After googling I found out that I can't create more than one additional partition in ...
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13 views

Why does disk utility want to erase my RAID 1 set?

I have 2 disks, the first a 2 TB and the second a 5 TB the 2 TB is split into 2 partitions and the 5 TB into 3 partitions with one 2TB RAID0 set, one 1TB RAID1 set and one single 3TB partition. I now ...
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1answer
383 views

Backup Disk 'doesn’t contain an EFI system partition'

I have a 750GB Western Digital external HDD which I use for Time Machine backups (MBP, OS 10.10.3). Today I had the need to boot to recovery, which I did from said backup. But I was unsuccessful in ...
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1answer
1k views

USB Drive Will Not Mount, Not Listed in Disk Utilities, but Found In System Profiler

I have a Seagate FreeAgent Go drive with the optional docking station. I use it to keep files that I don't access on a regular basis and as a place to do "quick backups" of things like my Paperless ...
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2answers
32 views

Recovery HD left in the middle

I did some partitioning to install Linux. Then I decided to erase that partition altogether. Now I am left with a configuration like this: How can I add the free space to main partition?
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1answer
95 views

Flashing question mark when I start my Mac

https://support.apple.com/en-us/HT204323 I tried everything in here didn't work. I am using a 13" macbookpro retina, latest OS. Stuff I did that might have cause this: I updated 3 apps 1 of them ...
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1answer
824 views

Problem after erasing the HD of a brand new Mac (OS X Yosemite) with Disk Utility

I cannot reinstall OS X Yosemite now, as there's no hard drive I could see. I had erased the HD with the idea that it will create a new partition but it didn't, so now I can't see a hard disk on ...
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2answers
167 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
41 views

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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2answers
232 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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0answers
89 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 ...
0
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1answer
109 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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1answer
57 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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2answers
29k 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 ...
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3answers
817 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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0answers
39 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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votes
1answer
194 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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2answers
6k views

Erase MacBook hard drive without OSX disc

I would like to erase everything on my Mac's hard drive as I'm going to recycle or sell it. Is there a way to do it without OSX disc?
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23 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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1answer
138 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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1answer
902 views

How to add free space to a Logical Volume Group? (Resizing Partitions)

I have two CoreStorage volumes on disk, one is 200GB the other is 50GB. I want to make the 1st 125GB and the second one 125GB. Currently I have been able to use the diskutil cs resizeStack command to ...
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41 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 ...
2
votes
1answer
2k 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 ...
2
votes
3answers
446 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
75 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: ...
2
votes
2answers
131 views

Why does Finder see volumes which are not under /Volumes?

If I navigate as high as possible in Finder (under 10.10.2, but this did not appear only recently), I see this window, with many volumes which are long unmounted, ejected and erased. But if I tried ...
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0answers
96 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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0answers
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
19 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 ...
2
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0answers
332 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 ...
0
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1answer
634 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
37 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
205 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 ...
0
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1answer
175 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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0answers
62 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
370 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
20 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
389 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
833 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 ...