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

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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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32 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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1k 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
16 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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22 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
50 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
29 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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50 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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73 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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36 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
119 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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65 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
65 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
102 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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263 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
137 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
42 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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35 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
43 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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29 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
215 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
37 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
57 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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32 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
138 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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64 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
31 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
84 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
82 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
111 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
93 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
80 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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27 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
744 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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156 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
112 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
389 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 ...
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1answer
119 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 ...
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2answers
928 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 ...
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3answers
95 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 ...
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1answer
886 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 ...
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21 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 ...
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64 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 ...