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

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19 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 ...
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22 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
44 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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17 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 ...
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1answer
11 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 ...
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24 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 ...
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16 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
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1answer
33 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 ...
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59 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 ...
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2answers
38 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 ...
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46 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 ...
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42 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 ...
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2answers
38 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 ...
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1answer
140 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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18 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 ...
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1answer
25 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 ...
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1answer
24 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
92 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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27 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 ...
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1answer
37 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 ...
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1answer
24 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 ...
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1answer
44 views

Issue with burning Linux .iso file using Disk Utility

I'm trying to create a Linux installation drive. I have an empty hard drive (MS-DOS format), and I already dragged the .iso file to the sidebar in the Disk Utility app. However when I press it the ...
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1answer
32 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 ...
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1answer
20 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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89 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 ...
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1answer
35 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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1answer
44 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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40 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
20 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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1answer
31 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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1answer
45 views

Logical Volume Group “Available Space” [duplicate]

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 ...
2
votes
1answer
95 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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1answer
94 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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2answers
195 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
27 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. ...
2
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2answers
55 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 ...
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1answer
56 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 ...
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1answer
41 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 ...
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1answer
60 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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1answer
160 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
3answers
106 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 ...
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1answer
90 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 ...
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1answer
68 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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0answers
22 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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0answers
24 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 ...
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37 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 ...
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2answers
23 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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2answers
159 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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0answers
11 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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2answers
47 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 ...