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

learn more… | top users | synonyms

1
vote
2answers
702 views

Restore Recovery HD partition from Yosemite downgrade

I recently got back to Mavericks from Yosemite, everything went fine. As I normally do, I checked my HDD with the Disk Utility and found some trouble, then I boot on recovery mode to fix my HDD. I ...
0
votes
1answer
12 views

Cannot erase HD partition - Could not find partition to expand, first partition on the disk?

My current HD status is When I try to remove the "Free" partition, the log returns "Could not find partition to expand, first partition on the disk?" What can I do?
0
votes
1answer
532 views

diskutil eraseDisk results in Error: 12: POSIX reports: Cannot allocate memory

I'm trying to format my usb drive that is partitioned with FAT32 by the following command in Terminal: $ diskutil eraseDisk JHFS+ UntitledUFS disk1 However, I get this output: Started erase on ...
1
vote
3answers
6k views

Changing a Volume's “Device / Media Name”

I know a Mac volume can be renamed... obviously. But if you look at the output of diskutil you will see that a volume also has a "device name" that corresponds to the name it was given when it was ...
0
votes
1answer
26 views

How can i recreate my Partition Table

What happened: While i was tinkering around with my bootcamp partition something went terribly wrong. end of story is, i have no partitions left in my partition table The current situation: i can ...
0
votes
1answer
189 views

How to merge two Mac partitions?

Recently I ran Boot Camp Assistant to install a copy of Windows 7. The "Partitioning Disk" process froze and I force quit it - I know, bad idea - and although I was left with a functioning Mac, I ...
0
votes
0answers
11 views

Used DiskMaker to create bootable USB, got error 10600, USB won't mount

I tried creating a bootable USB for Mavericks. Downloaded and used DiskMaker X. Got an error, -10660, and the app closed. Now my Mac won't mount (or recognize) the USB drive. It doesn't show up in ...
1
vote
1answer
570 views

Image files made with Disk Utility creates parent folder

I'm using OS X 10.5.8., updated from 10.5.2. which I installed from the two installation DVDs that came with my MB404 MacBook. I recently found my original 10.5.2. installation DVDs, which I thought ...
0
votes
1answer
34 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 ...
1
vote
0answers
27 views

Can't mount (Core Storage) encrypted volume anymore

I use the following setup: SSD: System Internal HDD: Data (Documents, Music, etc.) Both disks are encrypted via the Core Storage utility. It seems I can't mount the "Data" disk anymore. I wanted ...
2
votes
2answers
3k views

Can't partition startup disk in Mavericks for Boot Camp

I recently upgraded my computer to Mavericks (I believe I have the latest version, 10.9) and I've been trying for 2 days now to install Windows via Boot Camp on my computer, but it always fails at the ...
1
vote
1answer
18 views

Trouble with my partitions [closed]

I have some trouble with my partitions on my Macbook Pro. I created 2 partitions. One named "Yo" where I have installed the last Developer preview of Yosemite. Another one named "Save" where I put all ...
3
votes
2answers
617 views

Encrypted/Journaled Seagate won't accept Password

I have a 2011 MacBook Pro Intel running Mountain Lion. I have a 2tb Seagate External Drive with 3 partitions: all three were set up the same way with different passwords as a person who used to live ...
0
votes
1answer
72 views

Files missing after doing disk repair

I have an NTFS external disk, And I followed a stupid tutorial, it told me to repair my disk then I can delete the 'un-deletable' files in the NTFS external disk. However, When I done the ...
5
votes
1answer
2k views

Unable for format / erase hard drive

I have an external HD that died on me a while ago and I'm trying to see if I can format / erase it to start using it again. The disk does not show up in Finder but I can see it in Disk Utility. When ...
2
votes
7answers
10k views

disk utility can't repair this disk. backup as many of your files as possible

I have an external hard-disk with a single Mac OS Extended partition. This disk stopped working couple of days ago. I tried to repair the partition with disk utility but no luck. The error message is ...
2
votes
1answer
2k views

diskutil coreStorage in Lion fails to create a concatenated LVG, error -69886

I would like to create a logical volume group (LVG) with two physical disks. Issue The command: diskutil coreStorage create LVGNAME /dev/disk1 /dev/disk2 returns: Started CoreStorage ...
1
vote
1answer
24 views

Reformat Time Machine backup drive back to an ordinary external hard drive

I have a WDC Passport external drive which I used as a time machine backup. However, I do not want to use it as Time Machine backup anymore, I just want to use it as a regular external hard drive. ...
0
votes
1answer
41 views

unallocated space on disk0 under Mavericks

I have the same kind of issue than here : Create new partition in unallocated space with diskutil but on disk0 ! I don't know what to do anymore :( So i can't modify anything with gpt. I had Ubuntu ...
6
votes
1answer
2k views

Stuck in a boot loop after failed update to Mavericks, can't reformat HDD

I recently tried to upgrade a 2008 Mac Pro from Snow Leopard (10.6.8) to Mavericks (10.9.2) using the free upgrade available in the App Store. The upgrade seemed to go without a hitch until the ...
4
votes
2answers
65 views

Move some free space to Macintosh HD (Startup Disk)

On my mac hard disk, Macintosh HD (Startup Disk) is almost full, I need to increase the size of Macintosh merging some free space from my another partition. But I tried all possible ways, free space ...
1
vote
1answer
93 views

Can I remove one partition on an external drive, while keeping the other intact?

I have an external USB drive, which I've partitioned into separate FAT32 ("MOVIES") and OSX ("TIME_MACHINE") partitions: I now wish to remove the FAT32 partition and just use the OSX partition. ...
0
votes
1answer
52 views

DiskInventor & OmniDiskSweeper shows different size as Disk Utility

I am running 10.9.4 and have a 120 GB hard drive. Disk Inventory X shows only 51.9 GB of data, but About this Mac and Disk utility show less than 10 GB free space. I tried these items: Timemachine ...
1
vote
1answer
998 views

How to mount Linux_RAID on OS X

I have a NAS that broke and it used linu_RAID as its format type. How do I mount this in OS X? Similar to this one... ...
1
vote
2answers
5k views

Disk Utility won't allow to delete and resize partitions

I'm running OS X 10.9 and I had a linux partition when I updated from 10.8. Since I updated I can't boot on linux, which is no big deal for me. Though I would Like to delete the partition that is left ...
3
votes
1answer
11k views

Create new partition in unallocated space with diskutil

I have deleted the first partition on my external HD such that it now has 100GB of free space at the beginning of the partition. I'd like to reclaim that space, but Disk Utility doesn't let me create ...
1
vote
1answer
652 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 ...
0
votes
0answers
14 views

Find mount points from network mounts in Disk Utility

I know lots of ways to find mount points for my mounted drives, both locally or on the network. This question is specifically about 'Disk Utility'. Disk Utility does a fine job of telling me info ...
3
votes
2answers
398 views

how can I delete a partition (coreStorage logical volume?) from the Terminal?

I finally understood why Disk Utility will not change the partitions on my HDD, even though I added the most recent one myself (maybe significant: to test Yosemite DP) with it. Now I see it says it ...
1
vote
1answer
1k views

Macintosh HD not showing up on disc utility

I am trying to do a clean install on my Macbook Pro 13" from 2011. Here is what I did so far: 1) Booted up on my USB Stick with Mountain Lion Installer mounted on it 2) Opened up Disc Utility and ...
0
votes
3answers
2k views

Fix slow startup after utility disk repair on a SSD

I have a 250Gb Samsung SSD 840 series with Trim support enabled installed on a mid-2009 13" Macbook pro running Snow Leopard (10.6.8, 2.26GHz, 8Gb of RAM) and I experience extremely slow startup after ...
1
vote
2answers
82 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 ...
1
vote
2answers
3k views

How to Erase Hard Drive Mac System (this partition can't be modified/unmount)?

I want to erase a disk (Mac system) to resize OS X Mountain Lion to the max volume but I couldn't resize it nor unmount the other disk.
7
votes
2answers
13k 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 ...
0
votes
0answers
11 views

Partition Table Overwritten by MBR for USB external storage

I was trying to make my SD card writable again on my MBP which I had my 1 TB external storage connected to my Macbook Pro. So I ran the command $ sudo diskutil eraseDisk FAT32 SDNAME-SD MBRFormat ...
2
votes
4answers
2k views

Unable to Resize Partitions [closed]

I have recently created a partition on my macbook air running OS X 10.9, and this was to run install another OS instance (Yes, OS X 10.10 Yosemite, but that is an aside to the query I have) on it. I ...
8
votes
6answers
21k views

What is the best way to clone a disk between two Macs?

What is the best way to clone a disk between two Macs? I ask this every couple years or so and every time I get the same answer. "Use Carbon Copy Cloner", they say. But the unfortunate fact is that ...
0
votes
0answers
68 views

Problems restoring Windows to partition using Winclone

I installed Windows on my 2012 iMac a couple of months ago and it all worked out fine until my programs needed updates and I realized I had given my Windows partition to little space. I did some ...
1
vote
1answer
62 views

Time Machine Backup accidentally unplugged, can't repair

I accidentally removed my Time Machine backup without ejecting. It didn't show up in Finder after I plugged it back in and Disk Utility cannot repair it. Disk Utility recommends reformatting the disk, ...
0
votes
1answer
78 views

Restore Macintosh HD to its original partition configuration

I seem to have badly botched a Boot Camp installation of Windows 8.1. I used Boot Camp Assistant to create a 200 GB BOOTCAMP partition on my 1 TB Fusion Drive. I then rebooted and failed to install ...
0
votes
1answer
64 views

Erased hard drive, trying to Reinstall Lion OS X… HOW?

My mac wasn't loading past the boot screen (white, apple logo, spinning gear). So I CMND + R and went to disk utilities and ran Disk Repair. It could not repair. I tried everything. Even a an fsck ...
0
votes
0answers
5 views

How do I change defaults for New Disk Image in Disk Utility?

Can I change the default options (dmg vs sparsebundle, encryption, size, etc.) for new disk images in Disk Utility? I haven't found the right com.apple.DiskUtility setting names for these (if they ...
5
votes
1answer
2k views

Why can't I write to the last block of my SDXC card on my MBP?

I have a 64GB SanDisk SDXC memory card which I would like to use with my MacBook Pro and its SD card slot. However, I am having some trouble formatting/partitioning my SD card and I can't figure out ...
0
votes
2answers
152 views

external hard drive found only by disk utility, cannot eject or mount

I'm using a Seagate GoFlex that seems to have encountered some trouble. The drive does not appear on the desktop or Finder. I've double checked that Finder > Preferences allows for it to appear in ...
1
vote
3answers
91 views

Disk became full, had to force shutdown, now it doesn't boot

Don't know why I didn't get a warning about disk being almost full... It came down to zero free space and I couldn't do anything except force-shutdown it. I booted into Windows, deleted some files ...
0
votes
3answers
60 views

How can I erase hard disk if SuperDrive is broken (OS 10.6.8)?

I have an old MacBook running OS 10.6.8 which I want to recycle, but its internal SuperDrive doesn't work, so I can't use the install disk to do it. I tried plugging in Apple's external USB ...
1
vote
1answer
203 views

Disk repair failed after using osx with hibernated windows/bootcamp with macdrive

I forgot I just closed the lid of my MBP the last time I used Windows/Bootcamp (instead of shutting it down) and that triggered hibernation. The next time I powered my MBP on, OS X started ...
0
votes
2answers
510 views

Repartition hard drive with bootcamp on it

I currently have this setup on my Mac- OS X Mavericks 10.9.3, Windows (bootcamp) and a Recovery HD. My question is can I repartition my hard drive to have another partition, using disk utility (resize ...
0
votes
0answers
42 views

Warning “disk full” while more than 100 GB space free in disk utility

Why does the system warn me for "startup disk full" while "disk utility" shows there are still more than 100 GB space free? The warning is in the form of a pop-up dialog. Not sure how many ...
1
vote
0answers
18 views

iMac hard disk partially erased - now stuck

My iMac, about four years old, started playing up badly - went from being very slow to not doing anything (grey screen at start up). I tried resetting PRam without success, and then started up in safe ...