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

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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.
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1answer
15 views

Time Machine backup to a networked (no Airport or Time Capsule) drive

I followed this tutorial to backup with Time Machine to a hard drive shared on the network (no Time Capsule, Airport). However, when I go to Time Machine and click select backup disk, it simply opens ...
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1answer
44 views

Create new partition from brand new MacBook Air

I just purchased a macbook air, and when opening Disk Utility, I see the following: 251 GB Apple - Macintosh HD I want to have a 10GB partition besides the current one, which will have the format: ...
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1answer
24 views

Hard Drive Formatting Error in Terminal

I have tried formatting and partitioning this brand new hard drive and it has failed on multiple computers using multiple methods. It is a LaCie Porsche Design 4TB hard drive. Here is the commands I ...
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1answer
698 views

MacPro Hard Drive 3 TB or Larger formatted to Logical Volume Group by Disk Utility

I have an Intel MacPro in which I recently installed a new internal 3TB hard disk. I attempted to format it in Disk Utility using the standard GUID partition map and encountered a strange problem. ...
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1answer
7 views

Where is the temp file created by Disk Utility during erasure of free space kept on a non-boot volume?

I used Disk Utility to perform a secure erase of free space on an external non-boot drive, and ran into a problem and the process was aborted. I see that the file is still there because the drive ...
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0answers
17 views

What to do if repairing one disk made the other unrecognized?

Originally I had two drives, an HDD and an SSD (my boot drive). The HDD had a 100gb partition on it that used to have windows installed on it, but that partition got locked and became unusable. When I ...
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32 views

How can I fix GPT/MBR partition setup to Load Windows?

Ok so I had OS X Mountain lion and Parallels everything worked great. Then I portioned my hard drive to create an extra space for backups etc and with that I probably messed up my Windows. They do not ...
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11 views

Can you change the volume name when creating a disk image from an optical disc in disk utility?

I know how to create a disk image from an optical disc using Disk Utility. The problem is that I need to change the volume name for the resulting disk image.
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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 ...
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1answer
507 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 ...
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2answers
2k 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 ...
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2answers
2k 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 ...
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1answer
44 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 ...
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1answer
615 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... ...
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33 views

Bootcamp system operating missing error after resizing partition

I resized my partition to increase my bootcamp drive few months ago on Disk Utility on Mac and after that I decieded to have more space on Bootcamp partition so I resized it again by set new size for ...
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1answer
22 views

Disk Utility reports “missing thread record” on my external HDD

I have an external 500 GB HDD that's about five years old. I just turned it on and it made a bunch of clicking noises and failed to spin up immediately, though it did so after a few seconds. To be ...
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1answer
34 views

Is SDHC Card compatible with a MBP mid-2009?

I have a Mac Book Pro, mid-2009 model that has a SD card slot. I just bought a SD Card from SanDisk, 8gb, SDHC. When I insert the SD card in the slot, it is recognized by the MBP: I have a new icon ...
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2answers
1k views

Replace a failed disk in a Disk Utility RAID 1

I have LaCie 2big thunderbolt 2-disk device configured as a RAID1 from Disk Utility. One of the drives appears as "failed", so I unmounted the raid, replaced the drive and plugged it all back in. Now ...
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1answer
51 views

Can't mount primary HD, Disk Utility shows Invalid Node Tree Size

There are similar lines of questioning in the forum, but few valid responses. Apologies for reposting. I've searched for hours on end... I'm a tech consultant (software, not hw) helping my relative ...
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7answers
6k views

Partitioning secondary internal hard drive failure

Looks like my 2nd HDD became a brick. I tried to partition it via Disk Utilities/booted from recovery partition/diskutil to no luck! I got vague/strange errors such as: unable to unmount, or: ...
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1answer
16 views

Encrypt backups

Is it better to encrypt the hard drive you will use for Time Machine backup with Disk Utility or with Time Machine itself? I have noticed the the dialogue is slightly different, wherein Disk Utility a ...
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1answer
521 views

Move of time machine backup: unable to “restore”

I want to use a new hard drive for time machine. I try to restore the old backup into the new disk using disk utility. It fails with the following error : source volume is read-write and cannot be ...
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1answer
18 views

Can one slice of a “Disk Utility” RAID mirror be moved to a new computer?

With a 2-disk RAID mirror created in Disk Utility, after one disk fails, can the remaining good disk be moved to a different Mac and used successfully?
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2answers
247 views

Which format for external disk for performance?

I'm using OS X Mavericks and just got a new external hard disk. I don't need to share it with a PC (so no need for FAT) but I do want it to have better I/O performance. I'm a bit confused by the ...
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3answers
102 views

Reformat / resize an external hard drive removed from a NAS

I have a 3TB hard drive that I removed from a NAS that is only showing as 800MB on my Mac. Have tried Disk Utility (and terminal diskutil) but the hard drive keeps showing at the wrong size. ...
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2answers
52 views

Repair or reinstall Mac partition

I have a hard drive that is having problems on a Mac that doesn't use Time Machine or another complete backup system. I get this error when trying to repair the disk: Error: Disk Utility can’t ...
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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 ...
5
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1answer
457 views

External Hard disk 500 GB free but can't copy 8 GB data

I have WD external hard disk, which was working fine. Its MS-DOS formatted. I have downloaded a file in .mkv, which works fine, and isn't corrupted. Upon copying the 8 gb file, it says "The file is ...
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2answers
43 views

How do I remount USB Flash Drive or SD card?

I noticed that I could remount my USB hard drive through terminal after I eject it by typing diskutil list to find the drive and diskutil mountDisk /dev/disk"X"... So I tried to do the same with my ...
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1answer
65 views

Disk Utility does not show OK message after Verify Disk

Rebooted and Verified Disk twice. There is no OK message and stops here: Is it a new behaviour under Mavericks, or something wrong? How can I fix it?
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1answer
107 views

How to delete partition disk0s4?

A while ago, I dual booted with ubuntu linux and followed a tutorial on youtube to do so, but later I wanted all of my hard drive to be for osx, so I deleted the ubuntu partition, but now I am left ...
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0answers
51 views

Oops, I broke my MBR, what do I do?

I installed Mavericks a couple weeks ago and discovered to my dismay that last night, I couldn't boot into my windows install via bootcamp. I'd encountered this problem before, and without entirely ...
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0answers
25 views

Why does the diskutil shows I have two local hard drives?

I was trying to get my NTFS drive to work today and I discovered that the diskutil thinks I have two local hard drive. This phenomenon is not occurred on my Macbook Pro. Do anyone know why? Here is ...
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9answers
13k views

Macbook HD “Other” all the Sudden Almost Full

As you can see in the below image, my HD "Other" category is almost full. A couple of days ago, I randomly kept getting a popup saying that my disk was almost full. Then I went in and noticed the ...
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0answers
97 views

Mounting SMB network share from Mavericks recovery mode

I would like to be able back up my macbook on a weekly basis doing the following: boot into recovery mode mount a windows SMB network share use disk utility to save a disk image to the network share ...
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0answers
117 views

Remove “Windows” Entry from Mac Boot Loader

Background A while back, I installed Windows 8 on my MacBook Air (mid 2013 model) using Bootcamp. It never really worked, (it would freeze all the time, the WiFi would cut in and out, etc.) so I got ...
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1answer
151 views

How to restore Applications & Files from HD Backup (Migration Asst won't read it)

I recently had a problem with my MBP which wouldn't start up. After the chime it would shut down. I started using ⌘ cmd+R and ran Disk Utility. Had issues with my boot partition but no issues on my ...
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2answers
9k views

What are next steps when fsck reports “could not be repaired after 3 attempts”?

My Mac Book Pro 13.-" doesn´t get past the grey booting screen with the apple and the spinning wheel (The loading bar appears but when it´s done nothing happens) I have 220 GB in one single ...
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0answers
21 views

Disable auto mounting drive in OS X

I have two hard drives inside my MacBook, and I only want one to be auto-mounted at boot. I'm running OS X 10.7.5. I tried creating /etc/fstab with this line: ...
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1answer
167 views

Can't format 2nd HDD in optical bay on Mid-2012 Macbook Pro 13

I have recently bought an SSD and a HDD caddy to do a SSD+HDD setup. After installing, I can't format or reliably use my HDD while it's in the optical bay. I installed the SSD in the place of the ...
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1answer
144 views

How to reformat/install new SSD on MBP late2010 using OS X Internet Recovery

I had been saving some money to buy an SSD and finally I did. My old HDDs motor shut down so I had to replace it. I put it in the macbook all good but it isnt recognized by the system as a hard drive ...
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0answers
14 views

Equivalents for genisoimage and qemu-img on Ubuntu

How do I achieve the same result on OS X 10.9 as I do on Ubuntu with commands: $ genisoimage -output init.iso -volid cidata -joliet -rock user-data meta-data and $ qemu-img convert -O raw disk.img ...
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1answer
146 views

Disk Utility stuck around 50% when formatting SSD

I bought a SSD drive for my early MacbookPro 2011, since my old HDD was very slow and with crazy IO activity when idle. I started the Internet Recovery Mode and opened the Disk Utility to format the ...
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1answer
23 views

What does it mean when Repair Disk takes just a few seconds to complete?

I have the flashing finder icon problem. When I boot from DVD, I cannot choose the disk as Startup Disk. However, it appears in Disk Utility. When I run Repair Disk I can see the disk, and that it has ...
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2answers
332 views

Can I make an OS X ESD (or other USB drive) read-only?

I have a USB Flash drive onto which I've used Disk Utility to restore the Mac OS X Install ESD: Is there a way I can make the result read-only, in order offer it at lease some semblance of ...
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1answer
37 views

Backing up files from corrupt disk from Windows Bootcamp

So, mysteriously with no previous bad behavior my computer stopped booting, stuck in the gray loading bar cycle and then shutting down, the problem I believe wasn't obvious at first. I booted to ...
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1answer
39 views

Can OS X Combine Physical Disks

I have OSX Server 10.5.8 installed on a drive and I would like to combine 2 USB drives together to act as one drive. Is that possible?
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1answer
193 views

Enlarge Mac OSX disk

How can I enlarge my start up partition? I cannot drag the MAC OSX box (see below)
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2answers
162 views

Disk needs repaired… but it doesn't?

I've been noticing some oddities with my computer lately. Applications running slower than normal. Hanging. I decide to run Disk Utility and I get the following statement: So I do what it says and ...