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

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Cannot format Macbook Air SSD. Stuck at Waiting for disks to reappear

I'm having a Macbook Air with 128GB SSD and 4GB RAM with OS X Mavericks. I was using my Mac normally but suddenly chrome got stuck. So I held down the power button and forced shut down the Mac. When ...
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12 views

Hard disk drive problem with Macbook Pro, can't see and repair it

I have a problem with my MacBook Pro 13'' mid 2012. I have an external HDD and when I insert it, it doesn't appear on the desktop. If I go into Disk Utility I can see it, but it is written in light ...
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1answer
17 views

Can't modify partitions

I was beta-testing an Operating System and set up a separate 50 GB partition on my single 500 GB SSD. Now I cannot remove the beta partition. It shows up as another disk entirely. What can I do? As ...
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17 views

Unable to increase size of “Macintosh HD” partition because recovery partition is at the end of it [duplicate]

I've been using Boot Camp with Windows 7 from almost the day I bought my MacBook Air in 2012. Recently, I noticed that I had a lot more free space in Windows than I needed so I shrunk it using ...
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1answer
12 views

Combining two RAIDs

I have an OSX machine which houses 2 RAIDs made of 6 disks. The 2 RAIDs contain 6TB of data; they were set up with Disk Utility: A 'safe' 4TB RAID-1 (mirror) made of 2 x 4TB disks, 3.68TB used A ...
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17 views

Couldn’t modify partition map because file system verification failed [duplicate]

I accidentally deleted a bootcamp partition within Utility Disk. I tried to reclaim the free space by dragging over the free space but it does not work. Beyond this I verified and checked the disk ...
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1answer
147 views

Yosemite Disk Utility: You may only split this volume in two

I just upgraded to 10.10- Yosemite. I have an external 4TB hard drive. These are the problems I see with Disk Utility: No more than two partitions are allowed. Changing the partition size I can ...
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50 views

Restore MacBook partition table its original state

I have a Mid-2013 11-inch MacBook Air with 512 GB SSD. It came with Mountain Lion, but when Mavericks came out, I performed a clean install. Perhaps taking the idea of clean install a bit too far, I ...
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2answers
2k views

How do I fix my SSD after installing Yosemite and Enabling TRIM? No boot & can't erase

I recently upgraded to Yosemite, enabled FileVault and foolishly enabled TRIM (had no idea it wasn't supported). Upon restart, my machine gets the grey screen with the crossed-out circle of death. ...
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1answer
18 views

Trying to encrypt external HD . GPT scheme required . Do not want to erase data

Hey so i'm trying to encrypt my external hard drive (Seagate) and I right clicked on it and selected Encrypt [name] from the menu. Made my password but could not move forward because I got the error ...
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37 views

MAC OS X refuses to mount the main volume Macintosh HD, saying that there's an “Invalid content in journal”

I have a problem with my MAC. Yesterday it got stuck while it was trying to connect to a Wi-Fi network, then, since it didn't respond I decided to turn it off using the power on/off button ('). When I ...
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1answer
61 views

Cannot repair disk0s2 with mavericks utility disk on a SSD

I was trying to repair a corrupted partition (OSX Mavericks) the mac doesn't boot anymore (grey apple logo with infinty spinning gear). I've just tried with safe mode, PRAM restor etc... And the ...
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1answer
31 views

Need solution for RAID from old Mac

I have an old Hackintosh which I no longer use, except as a server to access 2 RAIDs made of 6 disks. The machine is too big, uses too much power, makes too much noise, and generates too much heat to ...
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58 views

Disk Utility on Mavericks fails because “disk is too small”

I'm on mavericks and I am trying to delete a partition of an external hard drive. This is its schema Partition1: 50GB "MavericksBackup": Bootable backup Partition2: 187GB "Home Data": Absolutely ...
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1answer
78 views

External HDD can be seen in Disk Utility but not in Finder

I've been using my external HDD a lot of times before on my Macbook Pro 13" OS X version 10.9.5, but it doesn't seem to appear in my Finder anymore. It can be seen in Disk Utility, though. Can anyone ...
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38 views

Accidentally Removed EFI Partition

I removed the EFI partition accidentally but I have it on a Time machine backup. Is there a way to simply move it from my external drive to my boot drive. I've tried restoring the format of the ...
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1answer
127 views

OS X Partition not resizable

3 weeks ago I installed Yosemite public beta onto a brand new Macbook Air which arrived with Mavericks pre-installed. To carry out the installation I created a new partition for Yosemite and so had ...
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1answer
76 views

Disk Utility will not let me create new partition

I am attempting to create a new partition from a 3TB Fusion Drive on Mavericks, but Disk Utility won't allow it. I successfully created a partition from the same drive last month, so I am not sure why ...
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1answer
67 views

I'm planning to sell my laptop, and I need to know if I have my bases covered. Kindly confirm please?

I have a 13 inch MacBook Pro (10.5.8 OS X - I think it's called Leopard). I do NOT have the installation CD - so I cannot reinstall the OS and thus ensure that I have securely deleted everything from ...
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1answer
109 views

Why is a secure erase 'not necessary' for SSD's?

I'm about to trade in a 2010 MacBook Pro with an SSD. However, I'm unable to do a Secure Erase from the recovery disk (as I used to do with mechanical hard drives before selling or giving away a ...
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277 views

Ran Disk Utility to Repair Permissions but not sure it's doing the right job

I wrote a script to parse Disk Utility log and output and permission changes that give more access than before. There were 5 results: 2014-09-21 21:42:31 +1000: Permissions differ on ...
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1answer
155 views

Can't mount Macintosh HD volume - journal issue

My MacBook Pro (Mavericks) keeps booting into OS X Startup Utility. Disk Utility shows Macintosh HD volume as unavailable - not mounted. Running fsck_hfs -l /dev/disk0s2 returns: ** /dev/rdisk0s2 ...
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42 views

External Hard Drive Locks Finder

Last week there was a short 10 second power outage and my external hard drive was attached to my laptop (Western Digital 750 MB drive). Message came up telling me the drive was improperly removed, I ...
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47 views

An external hard drive isn't recognized

Once I ejected an external hard drive incorrectly for some reason and from that time on it doesn't get recognized by my Mac so I can't see it plugged in at all (there's no sign in Finder that it's ...
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4 views

Unable to Erase USB / Trying to salvage

I am trying to salvage my USB but I keep running in to errors in Terminal. I attemped: diskutil verifyVolume /dev/disk2 Started file system verification on disk2 Checking file system ** /dev/disk2 ...
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2answers
43 views

Permanently Disable/Ignore Secondary Disk?

I have a 256G SSD and a 1T HDD in my 27" iMac. The 1T HDD is dying due to hardware failure. Is there a file in OS X similar to /etc/fstab in Linux where I can prevent this 1T HDD from mounting? I'd ...
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38 views

Disk Utility not appearing after running Internet Recovery

My MBP's SSD stopped working (got the blue screen of death or blue screen with black lines) so I purchased another SSD. I am trying to access Disk Utility to partition my new SSD but after running ...
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1answer
49 views

Emptying the Trash with a large (80GB) file caused disk to be filled with “Other” usage - how can I recover this space?

Yesterday I deleted an ~80GB VMWare Fusion virtual machine on my hard disk (an inbuilt 256GB SSD.) It went to the Trash, and when I emptied the Trash the computer slowed almost to a halt showing a ...
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30 views

1 TB hard drive - with only partition showing only 800 GB capacity

I have a 1 TB hard drive, which is correctly displayed in Disk Utility, but the actual (and only) startup partition only shows 800 GB of space. There is no unallocated space either. According to the ...
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36 views

Gained space on reformat and restore?

I was killing a Ubuntu partition, and had to do a full reformat to repartition properly. The operation would recover 20GB of space. I then took the following steps: I made a recover disk I backed ...
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2answers
262 views

Can't create partition on free space with Disk Utility

I have created new partition by selecting free space option and now I can't merge it or recreate it. I have tried to use iPartition to create a new partition on free space but it said I have no ...
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1answer
44 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?
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1answer
60 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 ...
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34 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 ...
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1answer
151 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 ...
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70 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 ...
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1answer
32 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 ...
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1answer
96 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. ...
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1answer
83 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 ...
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1answer
112 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. ...
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2answers
94 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 ...
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1answer
86 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 ...
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1answer
95 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 ...
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28 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 ...
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3answers
825 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 ...
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26 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 ...
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160 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 ...
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1answer
117 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, ...
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3answers
517 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 ...
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8 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 ...