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

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797 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 ...
1
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1answer
71 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
60 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
223 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
4k 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 ...
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0answers
60 views

Can't accees a NAS (LaCie type) external drive after booting from a USB

I would like to make a dmg image of my drive and store it in a NAS drive - one that is accessed only via the local network. When working normally, I can access the drive, but I am not allowed by the ...
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1answer
7k views

How to recover my harddrive if I can't see it in the disk utility

I have a 2007 aluminium iMac which I upgraded months ago to Mavericks. Today it locked up and I held the power button to shut it down and cannot get it to start again. I get the flashing folder ? icon ...
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2answers
100 views

Which drive to I select to completely erase my system's hard drive?

Apple's instructions for completely erasing a system say to "select your startup disk". But my system shows a hardware drive icon and some gobbledygook as a name, and under that another icon and name ...
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0answers
78 views

Diagnose if corrupted volume is due to hardware problem

This morning when turning on a Mac laptop, it suddenly announced that an external backup disk (which was connected overnight) "can't be repaired". Disk Utility also says: Disk Utility can’t ...
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1answer
142 views

Cannot boot Mac Mini with stripped RAID -fsck hangs

Today we coould not get one of our machines running. After several hours of doing the 'standard' tasks like fixing permissions etc. we hit a dead end. Here's what's going on: Machine starts, we can ...
2
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1answer
3k views

partition map check failed because no slices were found

I own an early 2011 MacBook Pro running Mac OS X Mavericks. Recently, I tried to make 50 GB partition using Disk Utility but the whole process didn't complete, and I had to restart the system as it ...
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2answers
37k views

How can I delete everything from my MacBook Pro before selling it?

I have a Mac that runs Snow Leopard and I intend to upgrade it to Mountain Lion and sell it on ebay. However, I only have one hard-drive, and I'm sure I can't use something in my OS to delete my OS ...
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0answers
136 views

Files seem corrupted after transfer from usb drive

I recently switched Macbook so I transferred the files from my backup to my new computer, but it seems most of the files are corrupted. A few mp4 files aren't corrupted but everything else is! ...
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2answers
280 views

Can't resize main partition even in G-Parted

So I had an old partition that I deleted, and now moved all my stuff to the new one. Now I am out of space, and I want to resize it to fill the whole hard drive. But Disk Utility wouldn't let me ...
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0answers
34 views

Can I enlarge a RAID10 with Disk Utility?

I have a 4TB RAID10 (4x2TB disks) created with Disk Utility. I also have 4x4TB spare disks. Can I enlarge the RAID10 to 8TB (4x4TB)? This post suggests that I can break each mirrored set, and ...
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2answers
267 views

Cannot erase and reformat Mt Lion on Mac Book Pro

I am trying to erase and reformat my mac book pro. It has mt lion installed already. I have a usb w mt lion ready to go. When I go through the erase steps in the disk utility, the erase button ...
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1answer
1k views

How do I erase partitions on a drive that's been protected with FileVault 2?

I want to completely wipe a USB thumb drive, re-partition it, and reformat the partition as ExFAT, not JHFS+. Unfortunately, I used FileVault 2 on it when I made it and that seems to be preventing me ...
2
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1answer
4k views

Do persistently incorrect disk permissions indicate a disk should be replaced?

Something is wrong with my Mac, as indicated (and still unresolved) in the question: What is the Sixth Step of MacBook Repair? One possibility is that the main disk is faulty. Disk Utility reports ...
2
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1answer
7k views

How can I modify a DVD image (ISO) and then burn a new DVD?

I have a (legit) copy of Star Wars Battlefront 1 for the Play Station 2 (PS2). There are game mods available (different character skins etc) that I'd like to try. Apparently this can be done but I'm ...
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3answers
903 views

Write .iso to USB on Mountain Lion [closed]

I'm trying to create a bootable USB for Windows using Disk Utility on OS X 10.8.4. Downloaded CentOS 6 for 32-bit and tried to use Disk Utility to create a bootable USB drive. This method failed with ...
2
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2answers
682 views

CoreStorage: what does LVG status 'offline' and PV status 'checking' mean and how can it be fixed?

I converted a partition to a CoreStorage volume using this command: sudo diskutil cs convert disk0s2 -passphrase test123 Now when I run `diskutil cs list' the output shows that I still only have a ...
1
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1answer
777 views

Can I “restore” an iso image to my hdd to be bootable?

I removed my superdrive a while back but now I want to install a linux partition on my macbook. I installed rEFInd as my boot manager but now I need to boot into the arch linux iso. Normally I would ...
3
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1answer
4k views

How to fix “Error: -5341: MediaKit reports partition (map) too small” after upgrading to a larger hard disk?

I recently bought a new SSD drive, as my stored data amounts outgrew the old one a little bit. After copying all data using dd if=/dev/disk0 of=/dev/disk1, I want to enlarge my system partition, but ...
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0answers
99 views

How to recover files by original filename without access to beginning of disk/partition

As a result of a dd user error the first Gigabyte was overwritten on a recent Macbook Air and it seems the beginning of all partitions are lost. Except for carving files using photorec or similar is ...
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1answer
2k views

Partition corruption, still can see files in single user mode, would like to retrieve files

The problem started after forcing the mac to shutdown. Since then, when trying to boot, it stays stuck at the grey apple with spinning wheel. I've tried a few generic things to be able to access my ...
3
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1answer
220 views

How to kill the popup in OS X when a disk can't be ejected

With ZFS-OSX, sometimes when I try to force eject my HDD and it's failing, the following popup appears on my screen – floating on the top with all the buttons grayed out – and no possibility to close ...
2
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0answers
326 views

How do I (re)mount missing Firewire drives? Why do they vanish?

I have several Firewire drives that occasionally "go missing" even though they are connected to my Mac and powered on (the power light is illuminated). These drives do not appear in Disk Utility or ...
2
votes
2answers
9k views

USB drive stuck on read only

So my usb drive is stuck on read only and I have tried many different options which I have gotten from different websites. I have tried to restore/erase in disk utility but the options are greyed ...
0
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0answers
236 views

Can't create an encrypted disk image (permission denied)

I am trying to create a new blank disk image from the Disk Utility and when I select any kind of encryption and click on 'Create', it says it is unable to create the image because of 'permission ...
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0answers
25 views

Invalid Leaf Node Count - causes?

I recently had the above error which I fixed using DiskWarrior (after unsuccessfully fiddling with fsck in single-user mode). I'm just wondering: What are the possible causes of an Invalid Leaf Node ...
4
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2answers
3k views

Why does OS X now think I have two partitions on my external USB drive (plus random connection issue)?

I have an external USB drive that I have plugged into a USB hub, which gets unplugged from my computer about once a day. Most of the time I remember to unmount the drive before disconnecting so that ...
4
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1answer
3k views

How do I erase an encrypted TimeMachine drive on Mountain Lion if I've forgotten the password?

My question is similar to this question. I have a USB drive that contains an old encrypted backup. I don't remember the password and don't care about loosing the backup - I just want to be able to use ...
2
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2answers
6k views

Restore disk in single user mode

I wonder if it is possible to restore one partition to another in command line? The similar operation can be performed with Disk Utility, but unfortunately I cannot boot in graphics mode (even safe ...
1
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1answer
5k views

How to repair external hard drive that fails diskutil with 'Disk Full Error'

If I run fsck_hfs -y -d /dev/rdisk2s10 it putters along, rebuilds the catalog B-tree then fails when writing the new catalog to disk. bash-3.2# fsck_hfs -d -y /dev/rdisk2s10 ** /dev/rdisk2s10 Using ...
1
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1answer
1k views

What's the difference between enabling Time Machine's “Encrypt Backups” option, and encrypting my disk from Disk Utility?

I'm setting up Time Machine backups on a new external hard disk. I chose to first encrypt the disk via Disk Utility: But I also see these options: Is there any difference between an "Encrypted" ...
1
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1answer
457 views

Get the UUID from a mostly dead hard drive?

I have a mostly dead internal hard drive in my '07 iMac. I've switched the machine over to an external FW800 drive but every now and then, on reboot, the mostly dead internal drive will mount on boot ...
0
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1answer
112 views

USB drives connected to hub disppearing

I've got four external USB drives connected to a 7 port powered dlink hub. All of them are externally powered, save for one of them. The hub is connected to a late 2012 Mac Mini. If I connect the ...
1
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1answer
2k views

Disk Utility not opening in Mavericks

I had used a Seagate external HD as Time Machine back up for a year or so. Since I got a gift of a better EHD now I wanted to erase all data in the old EHD. I thought a simple Format through Disk ...
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0answers
436 views

Unable to create new partition with Disk Utility on external drive

I'm trying to create space on an external drive to clone my mac as a bootable volume with CCC. With Disk Utility I cannot modify it for some reason (probably because the same disk is used with Time ...
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0answers
2k views

How to make bigger Macintosh HD partition

I installed OS X Mavericks Server as a virtual machine to ESX. I'm doing some testing and now I need more space. Macintosh HD partition is 50 GB and I have expand it to 100 GB total in ESX but I need ...
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0answers
109 views

Attempting to restore .img files to disk causes corruption

When I download .img files for writing to a CD or USB I've noticed a problem under OS X (including Mavericks). If Disk Utility recognizes the image and burns it, the resulting disk is corrupted. If ...
2
votes
1answer
299 views

Grow HFS+ partition at the end of harddrive without partition-manager-cd or moving to another drive

I've got two HFS+ partitions and would like to grow the latter one but neither disk utility nor the commandline diskutil allow that. I don't want copy the whole partition to another drive and then ...
0
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2answers
274 views

Delete and merge Partition

My MacBook's HDD has 2 partitions. One has OS X 10.8 installed, the other one 10.9. I'd like to delete the first partition and merge the free space afterwards to the 2nd partition. What's the easiest ...
0
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3answers
3k views

Unable to eject or erase USB drives

I'm unable to eject USB drives. When I try, I get this error: The disk "Untitled" wasn't ejected because one or more programs may be using it. To eject the disk immediately, click the Force ...
0
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1answer
408 views

How to unmount a locked volume?

Sometimes, a volume refuses to eject because some program is using them. Sadly, Finder doesn't give the identity nor gives a way to solve the problem. So, how do you solve this problem in a clean ...
1
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1answer
382 views

iMac restart issue

I've got a 21.5", late 2011 iMac which has been acting up lately: after a normal shutdown, the computer would hang at the Apple logo, with the spinning 'loading' wheel below it. I managed to fix this ...
4
votes
2answers
18k views

installation stuck in a loop due to damaged HD

Right off the bat I'll admit it was stupid to jump into trying to install a new version of OS X to the only partition without having taken adequate precautions (no backups or recovery disks), but ...
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0answers
401 views

Disk Utility won't let me partition a disk

I'm trying to add a partition to my Macintosh HD using Disk Utility. However, whenever I try to do so, I get "the target disk is too small." I'm using OS X 10.8.5 on a Retina MBP, and there would be ...
2
votes
3answers
7k views

Can't change folder permissions

I'm running Mountain Lion and I have a folder in ~/sites that has a red icon on the folder and I can't open it because 'access is denied'. What I've tried: Get Info > unlock with admin password, ...
2
votes
2answers
2k views

What is the real working method of making a bootable usb drive?

Always when I need to make a bootable usb drive on a mac I struggle, I end up switching to windows because none of the below works for me, I'm using MacBook Pro: running sudo dd if=Debian.is ...