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

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70 views

How to fix GUID hard drive corrupted to MBR?

I have a micro SD that suddenly stopped working. I tried everything on the internet (believe me, everything). I don't mind losing the data on it, I just want to be able to use it again. So here I go: ...
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0answers
18 views

Disk's Volumes corrupted when shutdown during synch

I've had this issue for quite a while I had a Windows Dualboot. When running OSX, and when Dropbox is synching, when shutting down to boot into Windows, the disk where Dropbox was synching to gets ...
3
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0answers
28 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 ...
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0answers
34 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 ...
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1answer
665 views

Resize 'Macintosh HD" into unallocated space vacated by Bootcamp partition

I have a Boot Camp partition on my MBP. When initially setting up the Boot Camp installation I set this partition to be quite large but now I wish to utilise more of that space in the Macintosh HD ...
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0answers
50 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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1answer
330 views

How to format multiple exFAT partitions on USB drive?

I'm following the instructions in Creating a bootable Clonezilla dual partition USB device but using my Mac laptop running El-Capitan. I managed to create an MBR partition table and two partitions on ...
2
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2answers
82 views

Can Disk Utility Be Run Remotely?

My daughter has a late 2014 MacBook Air, but lives 900 miles away. I'd like to run a disk utility verify / repair, but I'm not sure I could talk her through it. And since that's a lower level ...
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1answer
253 views

How can I split a 60 GB file into 5 GB pieces on a Mac?

I would imagine using a Disk Utility partition, but I didn't see the option in Disk Utility to split a larger partition into several. How can it be done on a Mac? I am doing this because I would ...
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0answers
54 views

MacPro internal HD unreadable when moved to external USB Dock - and vice-versa

Since I just installed a NAS, and I want to transfer several TB from my Mac Pro's internal hard disks (4 of them), I wanted to make it faster by connecting those hard disks directly to the NAS using ...
1
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1answer
353 views

Crashed when creating a partition - now missing drive space!

Just a couple of hours ago, while I was taking a GNU course, I decided to create a partition on my SSD to have ubuntu installed, meanwhile the disk utility was doing that, suddenly it just crashed and ...
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1answer
72 views

Cannot extend partition after failed bootcamp install

I got an error while trying to install Windows 10 on my Mid 2014 Macbook Pro via Bootcamp Assistant. The error occurred whilst partitioning the disk: Your disk could not be partitioned. An error ...
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0answers
17 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 ...
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0answers
101 views

Cannot either mount or repair greyed out partition

As a likely symptom, I started boot camp earlier in today to install a dual boot Windows on my machine and the install/remove Windows option was greyed out and I could not select it. After that, I ...
0
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1answer
1k views

External disk - Unrecognized file system (-69846)

I have an external storage with 2TB that was working nicely. But since last week, when I unplugged the USB before eject it, the disk is not readable anymore. When I insert USB, I can actually see ...
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2answers
3k views

Can't Delete Partition

I created a partition to run Snow Leopard on my computer running El Capitan and no longer need it. I allocated 20GB to that partition. Here's what I've done. I first go into Disk Utility, select my ...
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1answer
384 views

Cannot unmount disk0 resource busy

I am unable to wipe my hard drive and install new OS X as the resource is busy. I would imagine this is because I have Recovery open on this disk and that's why it is busy. I've tried: diskutil ...
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1answer
30 views

MacBook hard drive formatting

I removed Filevault to resize the main partition. I had about 320 GB of data on my hard drive so I tried to reduce this partition. The partition wouldn't budge so I closed Disk Utility and shut down ...
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0answers
85 views

Free space not showing in Disk Utility after Boot Camp Error

I recently tried removing my Bootcamp partition via the Boot Camp utility. It gave me an error and did not restore my OSX partition to full size. I tried going into Disk Utility to manually restore ...
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1answer
109 views

Macbook Pro late 2011 version won´t boot up

Hi guys I have been searching the forum and haven´t seen a solution to my problem therefore i will start by explaining what happened. Last night all of a sudden my mac froze, the mouse would move but ...
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0answers
83 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 ...
2
votes
4answers
77 views

How can I find what is using the rest of my drive?

I am using a Macbook air. 64GB. My user directory has used 20.47GB Disk Utility shows 'Other' is 41.33GB and I only have 2.9GB free. What tools or command line commands can I use to find out what ...
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0answers
38 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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1answer
3k views

OSX El Capitan / Not Recognizing USB Hard Drive

I updated to OSX El Capitan a few weeks ago, and ever since I did so, my computer is having some issues with my Seagate USB 3.0 hard drive. In terminal, when I use the disk utility, the drive shows ...
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1answer
387 views

Cannot delete partition (minus greyed out) - non-encrypted, no core storage

When trying to install Windows 10 from scratch on my Late 2013 MacBook Pro, I was unable to remove the old BOOTCAMP partition through the Boot Camp Assistant. I erased the partition with Disk Utility,...
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0answers
12 views

Continuous Volume with different disk models

A) Can I retroactively add a disk to a continuous volume? B) Is there a problem with using different kinds of disk models in a continuous volume? They are all SSDs. I am thinking since it is not RAID ...
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0answers
80 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
71 views

Encrypted hard-drive I can't reformat in Disk Utility

I have an external HDD I wish to reform (erase) so I can put inside my MBP and make a DIY fusion drive. I've done the fusion drive before but Apple made me remove it for a logic board replacement. ...
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1answer
12 views

Transfer capacity between two partitions

I have created two partitions: System 850GB Data 150GB what I actually want is: System 200GB Data 800GB ...however, disk utility doesn't let me either merge these two partitions or transfer ...
3
votes
1answer
987 views

Messed up 1TB Fusion Drive Partitions (on iMac 5K)

Alright, so I did something stupid today, and I really need some help right now… So kinda like the situation in this post I think I messed up the Fusion Drive on my 1TB iMac (with BootCamp), I messed ...
0
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1answer
62 views

Did something wrong with partitioning my SSD

I tried to make a partition for Windows on my Mac by using Apple's Disk Utility, because bootcamp already showed me that it didn't work for some reason. But now I'm stuck with a 70 gb hard disk, and I'...
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0answers
24 views

Can not create an additional shared FAT partition for my bootcamp

I created a Boot Camp partition, and everything is working fine, but then I wanted to add a shared partition (FAT), so I can exchange files between my OS X and Windows bootcamp, but it says I only ...
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0answers
934 views

Apple Hardware Test result: 4HDD/11/40000000: SATA(0,0). But repaired Disk and Permissions w/o a problem

Ran an Apple Hardware Test. Result: 4HDD/11/40000000: SATA(0,0). Then repaired Disk and Permissions. Result: Volume appears to be okay. But during use, sometimes it freezes randomly and my MBP ...
0
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1answer
102 views

EFI automounts on startup

After upgrading to the newest El Capitan from 10.10. to 10.11.1 - I guess - the normally invisible EFI partition appears on the desktop as a regular volume on different machines, if I choose to show ...
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1answer
66 views

Time Machine offers to erase disk data (format), will it delete all my partitions?

So, I'm trying to perform my Macbook backup on my 3TB drive. This drive is currently has a GPT table with 4 partitions: BackupMain BackupKubuntu BackupWindows BackupMac Before BackupMain, there ...
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0answers
172 views

Fix hard disk not detected after force eject

I got an HDD on my Mid 2012 Macbook Pro 13 inch. I decided to upgrade to SSD and I want a clean install of El Capitan. After the SSD ugprade and OS installation I connect my old HDD as an external ...
4
votes
3answers
4k views

Remove disk image from the disk list

In Disk Utility I see two disk images (Flash Updates) But I cannot find where the image file could be. On the console with diskutil I see /dev/disk2 (disk image): #: TYPE ...
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1answer
114 views

MacBook Pro 2011 keeps booting the OS X Utilities and won't accept our Apple ID

Before the issue became my headache, one of our relatives created a partition on my MBP to keep their files. Yesterday they deleted their partition and there might be important files that was delete ...
1
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2answers
269 views

How to create an ISO from a file (not a directory)

I'm trying to perform some testing on old platforms. In this case, its Fedora 1 (circa 2002 or 2003). The VM software (VMware and VirtualBox) can't handle distros that old, so the guests don't have a ...
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0answers
159 views

Is there any way to add a NTFS option in the format list of Disk Utility in OS X EI Captian?

There are two partitions on my drive, one for time machine, one for storing files which are exFat format. I would like to get one minimal thing to support NTFS, I would like to create a filesystem ...
1
vote
2answers
1k views

Yosemite cannot detect SD card

I know their is a flood of these questions but I have a late 2013 macbook pro with yosemite 10.10.5 installed on it. My problem is it won't read some of my SD cards, i've run disk util with the pny ...
0
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0answers
36 views

Partition problems - No LVG detected in Terminal after BootCamp Erase through Disk Utility (I know, I messed up)

I'm very stuck trying to get my system to recognize a full HDD and run Yosemite cleanly after a poorly-executed BootCamp removal. Here's the steps in the process so far: I erased a Windows Partition ...
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0answers
89 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 ...
1
vote
1answer
47 views

Samsung SSD 830 disappears

A Samsung SSD 830 installed on a MacBookPro 2011 with Mavericks 9.5 was chugging along nicely until a file save action generated the coloured beachball ... and nothing else was active. I initially ...
0
votes
1answer
68 views

Is RAID1 volume usable while rebuilding RAID after disk failure?

One disk of my 2-disk-RAID1-stack has failed and I'm about to replace it. Is the volume usable—i.e. can I read & write just as I normally could—while Disk Utility is rebuilding the RAID?
3
votes
1answer
876 views

Reformat exFat with specific Device Block Size and Cluster Size

I have an 512 GB SSD on my MacBook Retina with one of the volumes disks0s6 formatted with exFat to use it on both Mac and Windows. diskutil info disk0s6: Device Identifier: disk0s6 ...
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0answers
88 views

Cannot delete Free Space on iMac 5K after I deleted Boot Camp partition with Disk Utility

I had Windows 10 installed via Boot Camp, and everything was running smoothly, except I did not think ahead when I had made the partition initially. So as I was using Windows more, I eventually ran ...
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0answers
73 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
16 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
28 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 ...