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

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3
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1answer
160 views

How to force a readonly volume to remount as read-write?

I have an external Firewire volume with some filesystem problems. One problem is that Disk Warrior can't fix these errors because there is not enough space left on this volume (in fact, it is ...
0
votes
0answers
175 views

How to mount a disk that was not ejected properly?

I am using OSX El Capitan 10.11.2 I have an external Western Digital of 1TB When I ejected I did not do with the properly way and now I am not able to mount I can see the disk here But when I ...
0
votes
0answers
195 views

External Hard drive are always readonly, even HFS+ and FAT32 format

I am running in to a peculiar problem. I have 3 external hard drives and few weeks back, I may have ejected one of them ungracefully. Ever since, they all are getting connected in read only mode. I ...
2
votes
1answer
29 views

When erasing media in Disk Utility, how can I change the default format?

Every time I erase my MicroSD card, I need to change the format from ExFAT to MS-DOS (FAT). Is there a way to change the default to the latter, or better yet, to default to the current format of the ...
0
votes
0answers
58 views

How to open a NTFS disk image file in OS X

I have a failing external HDD that I cloned to a working external HDD by making a disk image of it. Unfortunately, that cloned disk image file (and the original HDD) are of NTFS format. (I ignorantly ...
2
votes
1answer
351 views

Can't delete Logical Volume Group on Fusion drive

I have a 2014 iMac Retina running OS X Yosemite and a 3TB Fusion drive. I am attempting to restore it from a Time Machine backup, but when I try to do so, I get the error message, "The disk can't be ...
1
vote
2answers
729 views

How to remount external drive in OS X El Capitan without rebooting?

I have a MacBook Pro 15 Mid 2014 with OS X El Capitan. When I accidentally disconnect the external USB disk (without clicking eject), I can't reconnect the disk. If I remove and plug the disk back in ...
2
votes
1answer
182 views

Expanding a Fusion Drive partition

I created a partition on my Fusion Drive when I first purchased my iMac running Yosemite, and I would like to now resize that drive ("Data" in the screenshot below), but Disk Utility doesn't allow it ...
3
votes
1answer
239 views

I erased the partition where Windows 10 was previously installed. How can I merge it with my OS X partition?

So I started up Disk Utility and erased my BOOTCAMP partition and set the format to OS X Extended (Journaled). This is how my partitions look like now: As you can see, I have a BOOTCAMP partition ...
-1
votes
1answer
61 views

Modifying bootcamp (link include) - Error when writing Iso on USB stick

Thank you for your tutorial for modifying bootcamp for Early 2008 MacBook Pro... Bootcamp - No ISO Option On my side, modifying Bootcamp to add the new option have worked perfectly, but i always got ...
2
votes
1answer
161 views

Why is the “Encrypted” format not available in the list when erasing a USB flash chip in Disk Utility?

It shows up for normal, external hard disk drives. Is there a way I can force it to encrypt? The installed OS X is El Capitan.
2
votes
1answer
353 views

Cannot erase SD card with Disk Utility (El Capitan)

I have this SD card that I am trying to use to backup photos on a Windows computer. After using the SD card on the Windows computer, and copying the photos back on a safe drive, I cannot erase the SD ...
0
votes
1answer
184 views

How do I fix a corrupted USB drive on OS X?

I accidentally bumped the drive while repartitioning it and it unmounted. After that when I tried to repartition with Disk Utility I got Partition Failed with the error: Could not open device Now I ...
0
votes
0answers
72 views

How should I properly format my iPod nano 4th generation?

I've been the happy owner of an iPod nano 4th gen, 8Gb for a few years. Over the years, I've added and deleted many songs, lyrics, album art, etcetera, and I recently assumed that something was ...
3
votes
0answers
85 views

Should I be able to run disk utility on my Time Machine Backups?

Been having issues with Time Machine and backup so I ran disk utility on all my drives: iMac drive, iomega external HD and Time Capsule. When I run on Time Capsule I am getting a failure and this ...
0
votes
0answers
64 views

Mac HD unmounted and cannot be repaired. Can I still backup to an external drive?

My Mid-2012 MBP running on Mavericks has been slow lately--one day it crashed and I had to force shut down. When I turned it back on, it automatically booted to Utilities OSX without giving me options ...
1
vote
2answers
456 views

Can't reformat SD card (Yosemite)

I have a 2 GB SD card that I can't reformat. It seems pretty corrupted. If I go into Disk Utility, I get these various error messages for each option: Repair Disk: Disk Utility can’t repair ...
4
votes
1answer
107 views

MacBook does not mount, does not boot, does not read drive

When i press alt on my MacBook during startup, it only shows a disk that i used to have Windows installed (which is now empty). I erased that disk when i was last logged in on OS X. Then i tried to ...
2
votes
1answer
34 views

Large (800 GB) Disk Image on Time Capsule as pseudo-NAS?

I am considering getting a new Time Capsule (2TB) as a basic/pseudo NAS, in addition to a target for Time Machine for two macs. My macs each have a 500 GB ssd. Neither are currently even half full, ...
1
vote
2answers
249 views

Partition map rebuild

I have an external hdd that doesn't mount anymore. I think I screw up with all the research I done and things I try. I have vital info on this hdd and I'm really afraid to lose it. I tried this: ...
0
votes
0answers
17 views

Can't remove partition on Macbook

I can't delete a partition on my macbook. On my main hard disk, I selected the partition I want to delete however I can't click on the '-' symbole. I already read a topic talking about a similar ...
0
votes
0answers
53 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: ...
0
votes
0answers
13 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
votes
0answers
24 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 ...
2
votes
0answers
31 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 ...
0
votes
1answer
454 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 ...
1
vote
0answers
41 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. ...
0
votes
1answer
187 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
votes
2answers
55 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 ...
1
vote
1answer
102 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 ...
0
votes
0answers
42 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
vote
1answer
161 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 ...
0
votes
1answer
61 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 ...
2
votes
0answers
15 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 ...
0
votes
0answers
87 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
votes
1answer
821 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 ...
0
votes
2answers
1k 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 ...
1
vote
1answer
203 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 ...
0
votes
1answer
28 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 ...
0
votes
0answers
62 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 ...
0
votes
1answer
90 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 ...
1
vote
0answers
56 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
59 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 ...
1
vote
0answers
33 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. ...
1
vote
1answer
2k 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 ...
1
vote
1answer
242 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 ...
0
votes
0answers
11 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 ...
1
vote
0answers
63 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 ...
0
votes
0answers
56 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. ...
0
votes
1answer
11 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 ...