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

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16 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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votes
1answer
10 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
6 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
21 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
33 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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0answers
20 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 ...
1
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0answers
29 views

Unable to prepare any SSDs for OSX installation

I've tried four different SSDs over the last few months, on two separate Macs, and have been unsuccessful in getting OS X installed on any of them. The first was an OCW, the second and third were ...
0
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1answer
17 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
130 views

how to fix GUID hard drive corrupted to MBR

I am on OS X 10.9.5 with a late 2013 iMac. I have a 3TB hard drive that has an unusual problem. It is a Western Digital 3TB Red WD30EFRX. I formatted it with two partitions, both 1.5TB. One was a ...
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1answer
41 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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1answer
15 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
23 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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2answers
32 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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1answer
37 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 ...
1
vote
1answer
17 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 ...
0
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1answer
26 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
38 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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0answers
14 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
votes
1answer
21 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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0answers
26 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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2answers
39 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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1answer
28 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. ...
3
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0answers
20 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
42 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 ...
0
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1answer
32 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
22 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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1answer
45 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
86 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)), ...
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3answers
56 views

User directory taking up an additional 100GB+ of space

This is on my 2013 15" Retina MBP with the 256 SSD. Before you ask, yes, I'm including the ~/Library folder. My home directory is using ~175GB of space, which is pretty significant. I'm in a ...
0
votes
1answer
33 views

Best way to expand JBOD with RAID?

I currently have a Hornettek Enterprise Quad bay USB3 JBOD hooked up to a Mac Pro running Mavericks. It has two 3TB disks which are mirrored (RAID 1 using Disk Utility) and contain a mixture of ...
0
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0answers
32 views

How restore a USB Flash Drive without partition table?

I don't know why but my new USB Flash Drive seems not to have a partition table, and I'm unable to restore it with any standard tool. This is what I can see of it if I use the diskutil list command. ...
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1answer
80 views

Resizing a 100GB Recovery HD Partition

Some time ago, I used BootCamp to set up a partition for Windows 7 on my MacBook Pro (13" late 2014 if it matters) so I could dual-boot. I have since removed the partition using BootCamp, but still ...
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0answers
24 views

Hard disk doesn't show on boot after erasing with Disk Utility

I have inserted a new disk. It shows after holding the option key. Then I opened Disk Utility and successfully formatted the disk. I restarted and help option but now I can't see my hard disk. I ...
0
votes
1answer
23 views

Can't re-enable FileVault after growing `system` partition

I recently disabled FileVault in order to grow my system partition. This ended up being rather more complicated than expected, but it worked out in the end. Now that I have resized the system ...
2
votes
0answers
30 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 ...
0
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0answers
30 views

Initialize 6 TB internal hard drive

I've found it both economical and flexible to use a docking station with internal hard drives (the ones that look "naked", i.e., have no plastic casing) for backups. I use this docking station to ...
2
votes
1answer
85 views

exFAT-formatted external drive loses folders

I have an exFAT-formatted 3TB USB drive connected to an iMac running 10.10.3. The system lost power and when it came back up, the drive wouldn't mount. I tried Repair Disk in Disk Utility, and it ...
0
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0answers
75 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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2answers
54 views

Logical Volume Group 17gb “Available Space”

Can anyone help explain why there is 17 GB 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 ...
1
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0answers
71 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 ...
0
votes
1answer
72 views

mid-2009 macbook pro - erased. Now “Mac OS X cannot start up from this disk”. (and cannot install to this disk!)

I have a mid-2009 macbook pro, and the original 10.6.8 installer DVD that it came with. I booted up in recovery mode, and erased the HD (whether or not that was a good idea). My intention was to get ...
0
votes
2answers
73 views

MacBook Pro not booting, lost partition

I have a big issue with my MacBook Pro (OS X 10.10.4). I tried to enable yesterday the TRIM on my SSD disk (a Crucial I replaced myself). Everything was working fine since months but after restarting ...
2
votes
1answer
309 views

Boot Camp partition broken and can't be repaired in OS X 10.10.4

Suddenly my Boot Camp partition vanished: not visible in Finder, not visible on startup. In Disk Utility I can see the volume, but it's broken (verification log): Verifying volume "disk0s4" Verifying ...
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0answers
28 views

My LaCie Thunderbolt Big 2 is not showing on my desktop but it is showing in disk utility

I can't get access to my 6TB raid 1 (well it's suppose to be a raid one and some tech told me it sounds like it is striped but I swear I set it up as a raid 1). It is not showing on the desktop. But ...
1
vote
1answer
37 views

Wiping my New MacBook Pro after Using Command Q to Stop Migration

Got my new MB pro mid-2014 yesterday. Began migrating over wi-fi only to learn that it will take 14 hours that I don't have. After 45 minutes I halted on both computers using command Q. My ...
0
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1answer
26 views

How to reformat a USB to not be a bootable operating system

I recently created a bootable USB from a .img file, here's what the USB looks like: And this is what it looks like in Disk Utility: Is there a way to reformat this USB to just store files?
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1answer
165 views

Why does Disk Utility show “Macintosh HD” on both Logical Volume Group and the volume underneath?

After performing a clean install of Yosemite (erasing the entire disk using disk utility during installation), the original name of the disk (APPLE HDD HTS547575A9E384 Media) turned out to be ...
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0answers
47 views

Corrupt EFI Partition or Error b/c of Encryption? & Ghost Partition

I have a 2012 Mac Mini Server with two internal SSDs. Until recently, I had Mt. Lion installed on one of the SSDs, as my only boot drive, and used the other, rarely, for file storage. I created a ...
1
vote
1answer
47 views

Trying to restore Time Machine. Lost boot disk

I just bought a new Macbook Air after giving mine to my wife. Before gifting the old laptop I created a Time Machine backup. Now that I have my new MBAir, I went into Apple+R and chose to restore ...
1
vote
1answer
27 views

How to expand partition into free space that lies before it

I would like to expand my "journal" partition to include the free space that lies (logically) before it on the drive. How can I do this without losing the data in "journal". I have a few more ...