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

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3
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55 views

Should I be able to run disk utility on my Time Machine Backups?

Been having issues with Time Machine and backup so I ran disk utility on all my drives: iMac drive, iomega external HD and Time Capsule. When I run on Time Capsule I am getting a failure and this ...
3
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0answers
22 views

2 Disks with the same name, how do I delete one?

I initially boot-camped a disk into a windows partition, and wanted to delete it. Initially I thought formatting it to free space would work, but it didn't. I tried again and accidentally formatted it ...
3
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0answers
462 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 ...
3
votes
0answers
478 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 ...
3
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0answers
796 views

Time Machine and case-sensitive HFS

Time Machine defaults to formatting a new drive to Journaled HFS+ (case-sensitive), if you set up the drive from within Time Machine itself. However, my main drive (the one Time Machine will be ...
2
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0answers
26 views

Disk Utility modal dialog opens partially off-screen

The New Image modal dialog in the Disk Utility application (on OS X 10.10.5) opens up with the Cancel button off the bottom of my MacBook Air 11's built-in display. The green resize button, option ...
2
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15 views

Prevent recent files from mounting disk images

Files that are stored on mounted disk images show up in the Recent Files lists in my applications. If I unmount the disk image, and then choose a recent file, the disk image gets mounted ...
2
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0answers
189 views

Fixing damaged hard drive after OSX update

I recently tried updating my Macbook Pro Retina to OSX El Capitan, however believing this to be a simple routine update, I did not backup my computer. Of course, the update was unsuccessful, somehow ...
2
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0answers
55 views

Hard disk corrupt twice in 24 hours

My Macbook Pro 13" (2011) had a Seagate 1TB hybrid drive installed as a secondary drive some 4 months ago. Yesterday the volume somehow became corrupt and unable to mount. I managed to format it using ...
2
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0answers
48 views

USB Flash (Pen) drive vanishes after hibernation

I reboot my macbook (4,1 model + 10.6.8) very infrequently since I rely on the hibernation feature a lot. I also use USB flash drives a fair bit and there is usually one plugged in to one of the USB ...
2
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0answers
70 views

Lost partition on WD 1.5 TB external drive

My 1.5 TB WD drive failed out of nowhere and now it shows up saying "The disk you inserted was not readable by this computer" This is how it shows up on Disk Utility This is what sudo gpt show ...
2
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0answers
688 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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2k 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, ...
2
votes
0answers
211 views

Oops, I broke my MBR, what do I do?

I installed Mavericks a couple weeks ago and discovered to my dismay that last night, I couldn't boot into my windows install via bootcamp. I'd encountered this problem before, and without entirely ...
2
votes
0answers
181 views

Broken FileVault Drive

I'm coming to you having a few issues with my old hard drive. Basically, my MacBook crashed a few days ago. It seems like my disk has some bad sectors and has started a kind of autodestruction ...
2
votes
0answers
754 views

How do I write-protect a partition of a USB drive on OSX that can work cross-platform?

I bought a bunch of USB sticks that I want to give as a gift to friends and clients, with some files on them. I'd like to have the files non-erasable (though I realise they can format the drive, I ...
2
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0answers
234 views

MacZfs with encryption on os-x

I have followed these steps for setting up zfs (maczfs 74.3.0, OSX 10.8.3) with encryption. Everything works fine, till I restart the computer. After the restart, diskutil informs me that the file ...
1
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0answers
23 views

Repair an exFAT drive on Mac OS X after it's been improperly disconnected

Very often an exFAT external disk stops appearing in OS X. It doesn't appear in Disk Utility, Finder, diskutil list or About this Mac/System Report/USB. The only way I have found to fix it is to boot ...
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16 views

Can not resize disk image file .dmg

I've found that OS X supports .img files which might be resized after it was created. Interesting thing is I can not resize more than 1 time :) is it real limitation or I'm doing something wrong ? ...
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0answers
33 views

Rsync for backups

I have gotten into the habit of using rsync to do my own backups of an encrypted volume containing my personal info onto an external hard drive. I did not use Time Machine, because I do not own the ...
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0answers
35 views

Time Machine Partition gone from external hard drive, can't repartition

I've got a 1TB external drive which used to have two partitions: One formatted in NTFS to share files between Mac and Windows, and one for Time Machine Backups. I haven't used it in quite some time. ...
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0answers
34 views

hdiutil convert not working and not telling me why

I've been trying to create a bootable Ubuntu flash drive following instructions from multiple sites. I need to convert the .iso file to an .img using hdiutil. For starters, the syntax of the command ...
1
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0answers
29 views

Is it possible to use diskutil to manipulate the read/write buffer of the SSD portion of the fusion drive?

Has anyone been able to use diskutil to manipulate the Core Storage LVM into increasing the size of the read/write buffer of the SSD? Currently the Fusion Drive keeps 4 GB free for new reads/writes. ...
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0answers
53 views

Messed up 3TB Fusion Drive Partitions (on iMac Late 2012)

I found one of the threads around here where you helped some guy with getting the Fusion drive back together after a failed attempt of using the Bootcamp on a Mac machine. Messed up 1TB Fusion Drive ...
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0answers
56 views

Disks not mounting (10.10.5)

Having an issue where multiple drives (External HD's via USB and an SD card inserted directly) will no longer mount when plugged in. If I open Disk Utility I can see the drive listed but the volume it ...
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0answers
46 views

Install rEFInd on separate partition (Errors)

I am trying to install rEFInd a separate partition but have run into an error. I'm doing this because I want to install Ubuntu on my other partition (separate from my Mac and and rEFInd partition). ...
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0answers
12 views

Recovering a partition on a flash disk

The other day my 128gb flash stick refused to be recognised when I plugged it in, giving me a 'failed to initialize' error with options to format it or eject. This was particularly frustrating because ...
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0answers
21 views

How to add addional HFS+ partitions after installing Windows with Bootcamp

The goal is to create a few extra HFS+ partitions after running the Bootcamp utility while not breaking Bootcamp's boot-ability. I am Running OS X El Capitain, and I only have a single disk drive to ...
1
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0answers
17 views

How to fix this hard disk on a virtual machine?

I have been using OSX on a virtual machine for some time, for developing purposes. From today, I'm starting to have hard disk issues. The Disk Utility Tool says that the hard disk has 107.37 GB, but I ...
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0answers
12 views

Schedule regular filesystem verification

I recently had a baffling several days troubleshooting some odd network problems, which was eventually narrowed down to my MacBook's Wifi adapter and then finally fixed by performing a disk repair to ...
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0answers
207 views

SD Card mounted but not accessible in Finder (OS 10.10.5)

On an early 2015 MacBook Air running 10.10.5, Finder will not show SD cards, despite the disk showing up in Disk Utility. In Finder preferences, I have set external disks to be shown on the Desktop ...
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0answers
233 views

Missing SSD space on MBPr 13, El Capitan

I have the following problem: I had two partitions, one was ~190 GB, and another ~60GB. Then I wanted to delete the second partition and resize the first one. The deletion went well (I suppose), but I ...
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110 views

OS X - USB key Fat32 cannot be open device in Disk utility -

am trying to reformat a brand new USB key ( EMTEC Click2.0 16GB Flash Drive) which is FAT32 formatted ( default) as I need to store oversized files ( > 4GB) to OS X Extended Journaled The key is ...
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909 views

How do I fix “Your Disk Could Not Be Partitioned” isssue with BootCamp Assistant?

I'm Alex and I'm attempting to install Windows 10 on my iMac 27" (2012) with 3TB+128GB Fusion Drive, but during install procedure I get the same error "Your Disk Could Not Be Partitioned" without any ...
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0answers
173 views

diskutil resizeVolume noob

Back story : After I installed Windows with Bootcamp, I wanted to make another partition where I'll install Linux, but couldn't do that from Disk Utility because I found on the internet that ...
1
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0answers
239 views

Broken fusion drive - SSD size is 0B and 'No CoreStorage logical volume groups found'

Some context first: I have late 2012 iMac 27" with 1TB fusion drive. Some time ago, for whatever reason, the SSD drive became visible in Disk Utility. I happily used the drive for Yosemite and ...
1
vote
0answers
86 views

Boot stuck at Prohibitory screen

I'm using Macbook Pro 2012 running Mac OS X 10.10.3 and earlier today, I was trying to install Linux on a USB drive through Terminal. I first converted the format with this: hdiutil convert -format ...
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0answers
48 views

Bootable usb from dmg taking more space than it should

I have made a bootable USB disk using a DMG and restoring it to a partition. I planned on making this USB a multiple-version recovery USB for use at a repair shop, but I can't fit everything I want ...
1
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0answers
17 views

Cannot reclaim partition as free space

I'm trying to reclaim some free space for my main SSD but I'm having problem, the disk utility won't let me expand. Btw I checked for core storage and it said there wasn't any. I can't use ...
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0answers
200 views

Time Machine drive doesn't mount; exit code 8

My Time Machine backup disk is borked. Normally, I'd just reformat and re-run the backup, but that disk also has a folder of pictures separate from the Time Machine files that I need to recover. The ...
1
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0answers
176 views

How can i delete a partition in Terminal when I can't simply combine because 'The given partitions are not on the same whole disk'?

Before I partitioned my HD, the only one I had was "Macintosh HD". The partition created one called "Macintosh HD2" I used terminal to erase "Macintosh HD2" somehow, but it returned as "Untitled." ...
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0answers
103 views

Cannot resize Macintosh HD

I currently have elementary OS installed alongside Yosemite. When I try to resize Macintosh HD to give space for a Windows installation, I get the "filesystem support for resizing required" error even ...
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0answers
683 views

“Couldn’t create temporary file” error when erasing free space on startup disk

When I tried to erase space on Disk Utility, it couldn't create a second temporary file for my startup disk.
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0answers
26 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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0answers
115 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
324 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 ...
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0answers
2k views

Resizing and moving OSX partitions in Disk Utility

So, I have a Mac Mini with a 160GB drive (it's an old model but it's only for testing). It had 4 versions of OSX on it but one needed more space so I removed the oldest version (Lion) and want to keep ...
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0answers
240 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
329 views

Why does hdiutil fail on symlinks when creaing an image of a Time Machine backup?

I am trying to create a compressed disk image of a Time Machine backup (that is stored on an external HDD) on Yosemite. hdiutil fails on the first symlink it comes across. Before the failure, there ...
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0answers
43 views

Partition failed performing a fresh installation

I'm trying to partition a samsung ssd and want to perform a fresh OS X snow leopard install from dvd. When I try to partition the disk in diskutil I get: Partition failed POSIX reports: The ...