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

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273 views

Is it unusual for “Verify Disk” on Disk Utilities to take so long on a Time Machine drive?

I have an external 3TB FW800 drive set up to be my Time Machine drive. I noticed some unusually high drive activity, and opened up Time Machine to see if it was backing up. Nope, TM showed previous ...
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1answer
30 views

Can I use the Recovery Partition on one startup disk to repair another (internal) disk?

I have an SSD and an HDD in my Macbook Pro (Yosemite) and I recently cloned the HDD to the (new) SSD. The SSD is now unhealthy, for reasons unknown and Disk Utility recommends repair from the ...
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0answers
15 views

Use diskutil without firmware password

Diskutil found some problems on my drive that need to be fixed in recovery mode. However the it department installed a password in the firmware. Is there anyway to start diskutil without the ...
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5answers
15k views

Disk Utility hangs prior to resizing partition

When trying to shrink the size of a partition, the period before the actual resizing happens (where Disk Utility says "Preparing to partition disk") hangs forever. I dug into Console to see what was ...
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0answers
7 views

How can I re-allocate the whole space for just one partition? [duplicate]

I'm running OX X 10.10.5 on my MBP with 500GB SSD. When I initially configured the computer I've created a setup with a boot loader so I was able to boot into Linux too. Since I'm using virtual ...
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95 views

How do I change the password on a Time Machine backup image?

I've tried using Disk Utility, but after entering the current password, I get a small dialog reading Unable to change password for “$image.” (Inappropriate ioctl for device). I've also tried hdiutil ...
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2answers
245 views

Backup disk suddenly won't work

Here's the error message I get: "An error occurred while copying files. The problem may be temporary. If the problem persists, use Disk Utility to repair your backup disk." When I try to follow that ...
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0answers
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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1answer
668 views

How to create a new partition for OS X, then remove the original one

I want to clean install a new version of OS X, so I was thinking to create a separate partition, transfer all applications and settings from my old system and then remove the old partition and make a ...
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2answers
905 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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3answers
416 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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1answer
83 views

Time machine backup or File Vault encryption of encrypted disk image

I have a small encrypted disk image on my Mac (Yosemite), containing account numbers, tax reports and such. I created it using Disk Utility, from folder, which I subsequently safely deleted. I am also ...
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0answers
43 views

Bootcamp problems have left my hard drive a mess

I have been trying to install Windows 8.1 via Bootcamp, and have had several problems that have resulted in failures (those are perhaps a different post). I'm using Yosemite. Currently when I run ...
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1answer
122 views

Resizing HFS+ volume after cloning

I cloned a disk containing an HFS+ volume to a larger disk using the command line dd utility. Now I want to grow the HFS+ volume to fill the new disk. There's an EFI partition before the HFS+ volume ...
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1answer
102 views

Can't delete empty partition

I've searched around on here and viewed posts such as: I deleted my Bootcamp partition but can't resize my OS X partition Can't ever remove partition? The second one looked most promising, ...
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0answers
906 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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1answer
262 views

Resize Mac Partition is Disabled - how to partition properly

I have two partitions on my mac book pro. One partition is running os Yosemite and other one is running bootcamp windows 8.1. Yosemite is 75GB and Bootcamp has 673GB. I shrinked the windows partition ...
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1answer
136 views

How to fix my partition table after messing it up trying to install Linux Mint

I tried to install Linux Mint alongside my working OS X Yosemite. I have a Macbook Air released mid 2013 with a 128gb SSD and 4gb of memory. Well to achieve my aim I first added a partition using ...
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2answers
11k views

How to fix “Error: -5341: MediaKit reports partition (map) too small” after upgrading to a larger hard disk?

I recently bought a new SSD drive, as my stored data amounts outgrew the old one a little bit. After copying all data using dd if=/dev/disk0 of=/dev/disk1, I want to enlarge my system partition, but ...
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2answers
205 views

Unable to repair hard drive - due to volume assignment problem?

Disk utility and fsck [terminal] both agree that there is problem with my HD. I am curious if someone can help me figure out how I can deal with the problem. Terminal - Normal Mode MacBook-Pro:~ ...
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1answer
642 views

External hard disk not showing up on finder and can't be verified in Disk Utility

My Mac suddendly restarted and now the external hard disk I normally use for Time Machine backups is not working anymore. When I plug it in, it doesn't appear on finder and while it appears in the ...
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0answers
27 views

RAID + FileVault and startup partition

From this answer: Why doesn't FileVault work on a RAID volume? I learnt that it is possible to have RAID and FileVault together. However it seem that the solution is for a separate data volume not ...
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1answer
215 views

Disk Utility reading disk incorrectly; viewing ext4 as JHFS+ and seeing Recovery HD

This is imported from Superuser, I felt like I would have an easier time getting an answer here than in Superuser - it is copy pasted, as below. So, I have some strange issues in Disk Utility and ...
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1answer
815 views

“Unable to unmount volume for repair” message from reformatted SSD in “Option/ALT startup” using bootable USB

I am trying to reformat a Samsung 512GB Pro with bootable USB, and I have manage to get through the prep for the USB. But after the "Option/ALT startup" i click on the USB to begin with and when the ...
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1answer
149 views

Why can I only have 2 partitions on my 3TB Apple Fusion Drive?

According to Apple, I can only have 2 partitions on my 3 TB Fusion Drive. I do not understand why. Techtool Pro made an eDrive, their emergency boot drive, and Apple made their Recovery HD. It ...
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0answers
165 views

BootCampAssistant “Install or delete Windows 7” greyed out

I need to install a Windows 7 on my MacBookPro but the installation button is actually greyed out. I first managed to install a first windows but i needed it to be bigger, so i deleted the BootCamp ...
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1answer
262 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
49 views

Cannot Partition Disk with Disk Utility

I can't seem to partition my disk with Disk Utility or with the Terminal command (see screenshots). Something also happened to my other partition running Mavericks, where it just turned into an "empty ...
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1answer
19 views

I cannot do bootcamp but my hard disk only have machintos HD and Data

The bootcamp said that my disk cannot be partitioned or restored as single partition. I am using macbook pro 15" but idk the version but the graphic card said gt320m 256 MB and 350 GB HDD i5 do i ...
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1answer
100 views

recover partial backup data from a (potentially damaged) Time Machine disk

I am on a MacBook Pro Retina 15-inch, late 2013, with OS X 10.9.5 Mavericks. First of all, to clarify the question, my goal is to create a new, working Time Machine (TM) disk, that has as much as ...
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1answer
114 views

Can't edit partitions with Disk Utility in OS X 10.10

I'm having trouble accessing about 50GB of space on my computer after a failed partitioning attempt. Before you ask, I don't know what went wrong, I just know that now, I can only turn the free space ...
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1answer
47 views

How to backup and restore MBP hard drive before reinstalling OS X?

My MBP Retina 13″ late 2012 is showing the stop sign and I know that I need to reinstall my OS. I have not got my hard drive backed up with Time Machine. Is there a way in which I can backup my hard ...
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3answers
72k views

Disk Utility won't Unmount HD for formatting

I have two internal drives in my 27" iMac (10.8.5). An SSD system disk and a 1TB SATA drive. The HDD has been acting up recently, very slow performance, bad behavior etc. Tech Tool Pro and Disk ...
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2answers
4k 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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1answer
53 views

Disk Utility not letting me Partition Disk

A bit of background before I start. I'm trying to install Ubuntu onto my Macbook Pro and so far I've stumbled into a bit of a roadblock. I've also already installed Windows 10 with Bootcamp, I'm not ...
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2answers
827 views

Can't restore Time Machine backup to Macintosh HD

Today I found my Mac shut down. It won't boot again anymore. When I try to turn it on, it just shows the Apple logo, a loading bar and after 1/3 progress it just shuts down again. After some research ...
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44 views

How to monitor progress of disk decryption in recovery mode

As the title states, I am decrypting an external drive using Disk Utility in Recovery mode, and would like a way to know the progress or completion as well as any errors. Is there a known way to do ...
2
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1answer
69 views

White prohibitory sign on Startup

Have the white prohibitory sign when trying to boot up MBP Retin 13" late 2012 running Yosemite. Have tried resetting PRAM (cmd + alt + p + r) and disk utility has been to no avail so far. Have tried ...
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2answers
507 views

Why can't I boot to Disk Utility (iMac A1418) - It displays a lock and a password field?

Someone showed me their iMac that they recently bought second-hand. It boots normally to the login screen with the PIN (EDIT: it is a PIN and NOT a passcode; the message reads "Enter your system lock ...
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3answers
7k views

Clone the Windows partition with Carbon Copy Cloner?

I have bought a new Hard Drive and I want to switch from my old disk to my new one. Time machine will do the job for my Mac partition, but not the Windows partition I guess. So I'm looking for way to ...
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0answers
61 views

Mounted image appears empty in Finder

I decided to reinstall MacOS X from scratch. I have rebooted my mac with Cmd+R, then used Disk Utility to create a .dmg disk image on a USB drive. I then rebooted the computer and verified that I ...
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1answer
690 views

Should I reformat a disk if Disk Utility asks me to?

I have a FAT32 external disc that was suddenly unmounted as I was using it. When I reconnected it and tried to Repair it in Disk Utility, I got the following messages: Verify and Repair volume ...
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1answer
97 views

Disk utility unable to change partition type

I'm trying to copy a .img disk image to a microSD. However, when I try to move the contents of the image I downloaded to the microSD, I get this: Same result when copying via Terminal. ...
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0answers
21 views

How do I resize my partition on my Mac? [duplicate]

I'm having trouble resizing my hard drive partition. Before, I was running OS X Lion in the free space above Macintosh HD 2. Now that I deleted the Lion partition, I am unable to resize Macintosh HD ...
0
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1answer
226 views

Finding lost partitions

I am resetting my sister's MBP late 2010 to factory defaults. It's all backed up. I'm reinstalling from the recovery partition currently. Before I started working on it today, it had the very ...
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1answer
81 views

How to rename (main) hard disk back to default? And is the disk default really LVG?

I recently reinstalled OS X, when it asked me to erase the disk I just left it Untitled, since there's no instruction to rename it to whatever on this Apple support page, after restoring with Time ...
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0answers
75 views

How make a ms-dos floppy .img

I'm trying to make a MS-DOS Floppy .img to use in virtualbox, but I don't know how... So far I tried: dd bs=512 count=2880 if=/dev/zero of=floppy.img or dd bs=1024 count=1440 if=/dev/zero ...
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2answers
4k views

OS X Partition not resizable

3 weeks ago I installed Yosemite public beta onto a brand new Macbook Air which arrived with Mavericks pre-installed. To carry out the installation I created a new partition for Yosemite and so had ...
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1answer
189 views

Does OS X's Disk Utility create hardware RAID or software RAID?

I created a mirrored RAID (RAID 1) using 2 Western Digital 2TB external hard drives before, using Disk Utility on a Mac. For this, it should be software RAID. And then I got a WD Thunderbolt Duo ...
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2answers
475 views

I can't resize my macintosh HD drive on os X 10.9.5

I have checked similar questions but didn't find an answer that worked. I have a macbook pro late 2013 with OS X 10.9.5. I have the OS X on the Macintosh HD drive (Mac OS Extended (Journaled)), ...