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

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13 views

Disk structure error reported in Onyx but not fixable via the Disk Utility in Recovery Mode

On Yosemite 10.10 Onyx returns the following error: Error: -69845: File system verify or repair failed Underlying error: 8: POSIX reports: Exec format error The disk needs to be repaired. I ...
0
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1answer
13 views

Disk issues on reboot [duplicate]

I have a rMBP (Mid 2012) that is having disk issues. When verifying the disk, I get three different errors: Incorrect number of file hard links Invalid first link in hard link chain Invalid ...
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0answers
17 views

Prohibitory sign on Mac startup running Yosemite

I used disk utility today on my MacBook Pro running Yosemite to create a bootable USB. I don't recall touching the hard drive of my MacBook Pro at all. After I finished the process, I went onto Google ...
7
votes
11answers
94k views

How can I repair a disk that disk utility says it can't repair this disk?

I have an external hard-disk with a single Mac OS Extended partition. This disk stopped working couple of days ago. I tried to repair the partition with disk utility but no luck. The error message is ...
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votes
4answers
26k views

“Warning: SUID file has been modified and will not be repaired” after repairing disk permissions

Warning: SUID file “System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent” has been modified and will not be repaired. I keep getting this after running Disk Utility ...
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1answer
18 views

Backing up Macintosh HD via Disk Utility (error -5344)

I am trying to backup the Macintosh HD, to my external hard drive via disk utility. I created a blank image and tried to restored my MacintoshHD to that image, but the error pops up, "Restore Failure: ...
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1answer
62 views

Macbook SSD Formatting Problem

I just got my Macbook here, and I got a USB with Yosemite 10.10. I opened up the Macbook, took out the old one, and put the SSD inside. My SSD fits perfectly (Samsung SSD 850 EVO 250GB). Then I ...
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1answer
1k views

cannot boot. volume disappeared from boot option after Disk Utility (GUI) repair

I have a 13-inch MBP with the latest OS X version. Problem Yesterday, I went to the Recovery Mode and performed Repair on my boot volume. I was not having a problem, but I just wanted to verify and ...
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1answer
13 views

System Formatter Failed While Erasing External Hard Drive Mac

I have been trying to erase my external Hard Drive "My Passport", however there was a problem and then the Hard Drive disappeared from the Desktop and could't be found. Only Disk Utility would see it ...
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0answers
30 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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1answer
18 views

Replaced OWC Mercury Accelsior E2 that I am using as a start up disk and it keeps disappearing

OWC replaced my Mercury Accelsior E2 because it stopped being recognized on my computer. They said the old one checked out ok even though I did their tests at home before I sent it in. When trying to ...
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3answers
3k views

How do I load the DiskManagement framework in single user mode?

From single-user mode in OS X 10.5, I want to run diskutil repairPermissions / but I get an error: Unable to run because unable to use the DiskManagement framework ... Is there a way to load the ...
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2answers
248 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 ...
0
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1answer
15 views

How can I reformat a USB

I used by USB to add as iso file into it. sudo dd bs=4m if=my.iso of=/dev/disk1 Now I want to get the USB back to normal. but the erase button in Disk Utility is disabled. How can I reformat this
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votes
1answer
23 views

Logical Volume Group “Available Space”

Can anyone help explain why there is 17gb worth of free space on my LVG I can't seem to do anything with this space. Is there anyway to fix this? I have already reformatted the disk then cloned the ...
3
votes
3answers
96 views

New securely erased drive not empty according to Disk Utility

Erased 32GB USB flash storage with Disk Utility's "Secure Erase" feature, one pass of zeros. Disk Utility now reports that there is only 26GB of my drive available. Not sure what is going on here, but ...
3
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2answers
2k views

hdiutil: compact failed – Function not implemented

When compacting a sparse image with the hdiutil compact command, it fails with the message hdiutil: compact failed – Function not implemented.
2
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1answer
72 views

Accidentally used dd on my main OSX drive

I've made a bit of a balls up... When attempting to create a bootable Ubuntu usb drive I accidentally ran dd on my main system drive :( sudo dd if=/path/to/image.img of=/dev/rdisk1 bs=1m I ...
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votes
2answers
7k views

Can't partition startup disk in Mavericks for Boot Camp

I recently upgraded my computer to Mavericks (I believe I have the latest version, 10.9) and I've been trying for 2 days now to install Windows via Boot Camp on my computer, but it always fails at the ...
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1answer
43 views

Disk Utility Weirdness: Macintosh HD Cannot Be Repaired But Then Has No Problems?

Earlier today, I decided to clean up my hard drive of extraneous files and other materials that might be taking up space. After doing some looking around, I found an application, OnyX, that was ...
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3answers
2k views

Cannot format MacBook Air SSD, stuck at waiting for disks to reappear

I have a Macbook Air with 128GB SSD and 4GB RAM with OS X Mavericks. I was using my Mac normally but suddenly Chrome got stuck. So I held down the power button and force-shut down the Mac. When I ...
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2answers
140 views

How do I repartition my Mac to get rid of my dual boot setup?

I setup dual boot on my Mac (with Ubuntu) and want to get rid of it. The Disk Util GUI shows me: However attempting to remove the disk0s4 or disk0s5 partitions results in: Could not unmount ...
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2answers
35k views

What are next steps when fsck reports “could not be repaired after 3 attempts”?

My Mac Book Pro 13.-" doesn´t get past the grey booting screen with the apple and the spinning wheel (The loading bar appears but when it´s done nothing happens) I have 220 GB in one single ...
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1answer
7k views

How to merge two Mac partitions?

Recently I ran Boot Camp Assistant to install a copy of Windows 7. The "Partitioning Disk" process froze and I force quit it - I know, bad idea - and although I was left with a functioning Mac, I ...
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3answers
25k views

how can I delete a partition (coreStorage logical volume?) from the Terminal?

I finally understood why Disk Utility will not change the partitions on my HDD, even though I added the most recent one myself (maybe significant: to test Yosemite DP) with it. Now I see it says it ...
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votes
2answers
4k views

Restore Recovery HD partition from Yosemite downgrade

I recently got back to Mavericks from Yosemite, everything went fine. As I normally do, I checked my HDD with the Disk Utility and found some trouble, then I boot on recovery mode to fix my HDD. I ...
2
votes
2answers
40 views

Split Macintosh HD into 3

At the moment I have 1 250GB partition on my mac (Macintosh HD). What I want to do is split my hard drive into 3 partitions. This is because I want to dual boot with Windows 8.1 and make a reserve ...
0
votes
2answers
24 views

Unable to be Repaired & Further Problems

I'll start off with some information about my USB. I use a SeaGate external hard drive USB with 1 TB. About ~250 gb of it is partitioned and formatted to create a Time-Machine compatible partition. ...
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vote
1answer
6k views

Macintosh HD not showing up on disc utility

I am trying to do a clean install on my Macbook Pro 13" from 2011. Here is what I did so far: 1) Booted up on my USB Stick with Mountain Lion Installer mounted on it 2) Opened up Disc Utility and ...
1
vote
1answer
23 views

Disk Utility works forever at trying to repair partitions

My computer froze yesterday while I was using a browser. I restarted and never got past a plain white screen. Finally was able to boot from a different drive and ran disk utility on my main boot drive ...
1
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1answer
36 views

Formatting Boot Drive As Encrypted For Clean Install

I don't know if my google-fu is broken today or something, but I can't seem to find any information about why I would or wouldn't want to erase and format an internal boot drive and/or partition ...
1
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1answer
39 views

ExFAT partition on External HDD not showing up on Bootcamp Windows 7

So I partitioned one of my external HDD's for my bootcamp windows, just so I could install some Windows files without having to resize my partition by erasing it and reinstalling. Using disk utility ...
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2answers
5k 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 ...
0
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1answer
76 views

Slow Internet Mac Yosemite Recovery Doom (MacBook Air, Early 2015)

Product: MacBook Air(early 2015) with OS X Yosemite. The issue is, that I happen to have my Yosemite reinstalled, so I restarted my MacBook and at the sound of the chime(startup sound of Yosemite), I ...
3
votes
2answers
4k views

diskutil coreStorage in Lion fails to create a concatenated LVG, error -69886

I would like to create a logical volume group (LVG) with two physical disks. Issue The command: diskutil coreStorage create LVGNAME /dev/disk1 /dev/disk2 returns: Started CoreStorage ...
0
votes
1answer
41 views

No disk to erase in Disk Utility Internet Recovery

Earlier today, my MacBook Pro 2013 went to the grey screen of death (folder flashing with the question mark) and now won't boot up. I started internet recovery all fine, but when I went to reinstall ...
18
votes
8answers
68k views

Unable to Resize Partitions

I have recently created a partition on my macbook air running OS X 10.9, and this was to run install another OS instance (Yes, OS X 10.10 Yosemite, but that is an aside to the query I have) on it. I ...
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vote
1answer
39 views

Can someone explain what 'diskutil cs revert' does?

so I was following some instructions to get my windows bootcamp partition to resize in disk utility, because after upgrading to Yosemite I was unable to resize my partition to give one side more space ...
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vote
0answers
20 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 ...
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vote
2answers
2k views

Merging partitions separated by Bootcamp

In the process of installing windows on my MacBook Pro, I managed to somehow partition the disk this way. Is there any way of merging the UNTITLED 3 segment with the Macintosh HD segment without ...
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0answers
14 views

USB drive appearing as two different devices

I just plugged an empty flash drive into my computer, and it thinks there are two drives - the flash drive I expected, and a small CD-ROM drive. Here is the relevant section of output from running ...
2
votes
1answer
179 views

Is this S.M.A.R.T. data normal for a 2013 Macbook Air SSD?

I have had a Mid 2013 13" Macbook Air for a couple of years but have barely used it as I am more of a Windows person. However, one of the things that has bothered me a bit since owning it is that the ...
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0answers
33 views

Seagate SSD doesn't work on MBP mid 2012

I have a MPB Mid 2012 and I bought a Seagate SSD ST1000LM014 http://www.amazon.com/Seagate-Lapto...34057423&sr=8-1&keywords=seagate+sshd+1tb+2.5 My mac doesn't format the disk if it's connect ...
0
votes
2answers
9k views

external hard drive found only by disk utility, cannot eject or mount

I'm using a Seagate GoFlex that seems to have encountered some trouble. The drive does not appear on the desktop or Finder. I've double checked that Finder > Preferences allows for it to appear in ...
0
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2answers
118 views

MacBook Air won't start up, won't enter secure mode and repair in Disk Utility

Unfortunately some data was downloading and my Mac got stuck, so I forcefully power it off. After that, I couldn't enter the login screen, because the loading bar was stuck. I tried to enter safe ...
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2answers
18 views

No entry grey screen with spinner with new SSD

My hard drive bit the dust rather spectacularly on my 2011 15" MBP. Luckily, I have a model without torx screws, so I popped it open, put in a 240 GB SSD I had lying around, and did and Internet boot ...
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votes
3answers
5k views

How can I mount an encrypted disk from the command line?

When I type diskutil mount disk3 in the terminal, it says Volume(s) mounted successfully. However, the disk is not mounted and I can confirm this by opening the GUI of Disk Utility.app and also the ...
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0answers
6 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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vote
2answers
32 views

Is there a disk space analyzer that lets you save the disk image?

I've seen there are a number of different applications for OSX that lets you visualize disk space and browse the category tree as an index - JDiskReport, DaisyDisk, Disk Inventory X, etc. I would like ...
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0answers
29 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 ...