Commonly used to refer to Disk Utility.app, an application included with OS X.

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WD Elements not mounted, appears to be disabled and can't be read on any platform

I use a Mac, and my portable HD suddenly quit on me. I searched the forums here and tried some of the terminal commands I came across to no avail. Here is the diskutil this is what it looks like ...
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48 views

Copy files from external hard drive that Disk Utility can't repair

I have a 2 Tb WD MyPassport Ultra external hard drive containing lots of important data, and a Macbook Pro running OS X 10.9.5. The harddrive fell while pulling down lots of data via wget, and now ...
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23 views

How can I backup my files in this situation (recovery mode)?

My disk has been corrupted and has forced me load osx in recovery mode. Going to disk utility, I've tried verifying an image which needed repair. After attempting to repair, I've gotten to the ...
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78 views

OSX10.11.3 How to combine disk partitions?

My MacBook Air was installed two systems, OSX and Windows, thus it has two disk partitions: Machintosh HD (40G) and BOOTCAMP (80G). I have decided to remove Windows from my MacBook. I used to the ...
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22 views

Is “DISKUTIL” available for Snow Leopard 10.6 MacBook Pro?

Is "DISKUTIL" available for Snow Leopard 10.6 MacBook Pro? Is there a way to reach the terminal of OS with a keyboard command when start is running?
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314 views

How does disk utility show negative disk usage for a USB Drive?

I have a 16GB (I think) USB flash drive. When mounting under OS X, the disk utility reports a capacity of 16.71GB, and available space of 18.52GB. And therefore shows that I have used -1.81GB of ...
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58 views

How to check what apps that prevent hard disk from sleeping in OS X

I am using OSX El-Capitan and i thing there is an app that prevent the harddisk from sleeping and keep it spinning. Some of the answer i have found is to check and repair the harddisk permission. I ...
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55 views

Fix an external drive not ejected properly with OSX or Ubuntu

I have an external drive of 1tb from western digital. It is formatted with NTFS. I ejected not properly from a mac and now I am not able to see the disk in finder, nautilus, disk utility or gparted. ...
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94 views

Why should we wipe disks multiple times? [duplicate]

There exists various ways of destroying the data on a disk. Even simple wipes differ, some disk utilities give these options: Format (does not actually wipe) Wipe 1 time with zero Wipe 1 time with ...
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26 views

OSX10.11 DiskUtility v.15 bug in SDXC card access?

OSX10.11 has DiskUtility v.15 and when trying "Info", "FirstAid", or "Erase" the SDXC card in the SD access slot; these functions never finish - therefore can't Quit Diskutility - only way to stop is ...
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2k views

How to remove temporary OS X RESERVED partition not deleted after Boot Camp setup?

The Question: After installing Windows 8.1 on a Mac using BootCamp, an 8GB partition called OSXRESERVED is left behind. How would one safely remove it and reclaim the space for the OS X partition ...
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58 views

Error preparing the Time Machine backup disk

One of my backup disks has problems. I keep this disk (BU2) at another location and do a backup when I'm there. The last backup was from before the upgrade to El Capitan. At home I have another backup ...
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1k views

No CoreStorage logical volume groups found

I ran the following command on my Mac diskutil corestorage revert BE18BCE1-9DEA-494F-84F0-9EFC34AFB9AE And now running diskutil corestorage list Produces No CoreStorage logical volume groups ...
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36 views

I can't find flash memory in Disk Utility

I installed VMWare Workstaion 12 on Windows 8.1 ,I created Mac OS X 10.8 on the VMWare ,now I pluging a USB flash drive and vmware can recognize that but I can't find that in Disk Utility on Mac OSX.I ...
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155 views

OSX refuses to create a partition on my 4TB external, despite free space

I have a 4TB HGST external Hard Drive. The first partition is for backing up my Windows system, which is 3.5TB, and there is ~500GB "free space" to let OSX create it's own HFS+ partition for Time ...
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45 views

SSD showing up with over a dozen *tiny* fake disks in `diskutil list`

I bought a new SSD from Other World Computing; unfortunately, now that I've got it installed, it's showing up as 14 individual disks, only one of which is actually of the advertised size: ...
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2answers
54 views

AWK formatting Disk Utility command formatting incorrectly

I am trying to learn awk at the moment and so I am trying it on the disk utility command. Here is the output when I run Disk Utility list disk0 /dev/disk0 (internal, physical): #: ...
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18 views

Can a Disk Image (Disk Utility) be opened by two users on separate machines at the same time?

I have created a Disk Image to place confidential information into that myself and another colleague will be working on. problem is, we have just discovered that we both can't access the disk image at ...
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2answers
132 views

Microsoft disk integrity tools like ScanDisk, CheckDisk, and Error-Checking? How do they differ? [closed]

There's been something I've been curious about regarding 'disk integrity' tools for sometime now... Specifically, as regards computers that use an operating-system by Microsoft, there's been 4 tools ...
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234 views

Claim Free Space / Unallocated space back Mac OSX

I've got a 1TB internal HD that has 213GB of free space that I can't access. 1TB -> -- Macintosh HD 618GB -- Recovery HD 650MB -- BOOTCAMP 104GB -- Unallocated Space 213GB How can I add that ...
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1answer
961 views

Mount USB drive as local folder on Mac

I bought an external 1TB USB drive and I want to make my Google Drive use the USB drive instead of my external disk. The reason why I want to do this is because my Google Drive account is 1TB and my ...
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133 views

Need to Convert Dynamic Disk to Basic Without Formatting

My hard drives got converted to Dynamic in order to increase the number of partitions. I tried Partition Wizard Server Version, but its not working. I need to convert the partitions to basic to ...
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1k views

OSX Partition failed with the error: The chosen size is not valid for the chosen file system

So I had a failing 1TB drive in my macbook pro, I managed to copy it bit for bit to a new 2TB drive. The new 2TB clone now works fine. I have 2 partitions on the new drive, OSX yosemite and windows ...
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127 views

Identify latest added or updated files in Windows file folders

In Windows Explorer, I would like to list all the files in a folder, including those in subfolders, and sort them by the time they were added, or the last time they were modified. I am trying to ...
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63 views

Disk Utility Requires Admin Password

I've been experimenting with Disk Utility lately, trying to create a password protected folder. The strange thing is, I tried to make an image out of this folder called "Chess" and it created ...
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2k views

How to quickly force-clear the dirty bit on ExFAT filesystem

My ExFAT partition is about 1TB and it takes chkdsk about 10 hours to check and clear the dirty bit flag. There is never an error. It is caused by the drive being disconnected in an unsafe manner (it ...
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1answer
156 views

Failed Yosemite TimeMachine “Use Drive (with Encryption)” renders drive unmountable on reboot

I turned on TimeMachine and told it to use my Drobo volume for backups, and checked the box for encryption. It thought about it for a few minutes and then bailed with an error stating that it ...
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647 views

Recovering data from a lost/deleted HFS partition in Mac OS X

I have a 2TB hard drive with 2 partitions. It got partition by a program into 5gb accidentally. I tried using Disk Drill Pro to recover the lost partitions and it could see it but could not rebuild ...
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39 views

How to throttle performance of a VHD (Virtual Hard Disk )

I'd like to be able to throttle the performance of Reads/Writes on some of my disks. While I know it might be pretty difficult to control that on actual Physical disks, is there any tool which can ...
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2answers
635 views

Partitioning issue after HDD to SSD sector copy and swap in Mac OS X 10.10 (Yosemite)

Recently decided to replace my nearly full 500GB hard disk drive with a 1TB SSD to breathe some new life into my mid-2010 MacBook Pro. I used a “toaster”-style drive cloner (Dyconn Dubbler) to do a ...
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136 views

How to merge a spanned volume?

I have ended up with my D Volume spanned over multiple partitions (On one physical drive) How do I merge them? (They are adjacent). Or how can I safely get my data off some of the partitions (So I ...
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737 views

diskutil rename error: “does not appear to be a valid volume name for its file system”

I'm trying to rename the volume name of a mounted ISO image using the command: diskutil rename /dev/disk15 TEST_DISK_2014_RENAMED I get the error: TEST_DISK_2014_RENAMED does not appear to be a ...
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1answer
4k views

Unlocking FileVault encrypted drive from Terminal (to allow pasting password)

I have a long, complicated password for an external drive encrypted with FileVault that I have securely stored, but OS X doesn’t allow pasting into the password unlock GUI dialog (argh!). How can I ...
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1answer
1k views

Cant boot MacBook Pro - HDD File System is Read-Only

I have a big problem - I think. The problem seems to be that my HDD is Read-Only so I cant boot and can not erase the HDD to reinstall the system. But here is the whole story. I bougth a used ...
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129 views

How to calculate size of a VERY large folder over FTP?

I have FTP access to a web-server which has a large folder (By large I mean ~200GB). How can I get number of files and it's exact size? I have tried 'du -hs' but it takes a life to receive a response ...
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1answer
44 views

Laptop Harddisk not working

I have a Seagate hard disk (Laptop HD) which stopped working unexpectedly. I just Googled and tried a few things to get it to work but nothing seems to be happening. I tried connecting the HD to my ...
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41 views

Write back partition being resized

I have problem with my mac it don,t boot. After some research i find out that it mark partition as crashed and want to check it. But while checking it say invalid sibling link and can't repair because ...
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2answers
870 views

Are these unrepairable SSD errors indicative of a SSD hardware error?

Some time ago I got an Apple authorised reseller to replace the SSD in my early-2011 model MBP with a Samsung 512GB 840-series disk. About three months later, booting failed with this error: Please ...
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26 views

Backup from HD Image (Mac)

I am trying to recover a system from a dmg. I copied the dmg onto my Documents folder and select the correct drive as shown: I did this by 1. dragged and dropped `MacIntosh HD` onto the ...
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1answer
30 views

Perform trim-like operation on a normal HDD?

Is there a way to perform the same thing on a HDD as Trim does on a SSD. I assume the used sectors should be rewritten with 0 or 1.
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13k views

Unable to create disk image using disk utility (Input/output error)

I want to create a disk image of source 100.03 GB Ext Hard Disk Media on destination 5TB Lacie ST5000DX000-1H2170 there is greater than 1TB remaining on the destination disk. The Disk Utility progress ...
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255 views

Use free space on a Mac (with a SSD)

I have a MacBook Air with a 128GB SSD, I installed Yosemite on a second partition then removed it and now I have that: 50GB of free space and I can't find how to give it to Macintosh HD (the ...
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1answer
55 views

usb hard disk can be read by device manager not be read by disk manager?

Today when i format my usb hard disk ,the power is off ,when power is on again ,i reboot my pc ,something wrong with my usb hard disk. The usb hard disk can be seen in Device Manager ,but can not be ...
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188 views

OSX partition smaller than 16 GB

I'm trying to create a new partition because I need a case-sensitive filesystem for web development. But the Disk Utility won't allow me to create one smaller than 16.84 GB. What am I doing wrong?
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293 views

AppleScript shows “Document could not be opened. You don’t have permission.” but file can be opened?

I am getting a "The document [filename] could not be opened. You don't have permission" when attempting to access several files in an AppleScript. However, I can open these files manually without ...
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1k views

Why would re-formatting an external disk drive stop random drive disconnects in OSX Mavericks?

My old MacBook Pro Retina was over heating, so after a long story omitted, I got a new MBP Retina with Mavericks pre-installed, and my Seagate Thunderbolt(TB)/USB3 drive started unmounting and ...
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2answers
12k views

Getting the diskutil command to work in OSX Mavericks Single User mode

I'm currently writing some single user mode maintenance scripts. My current goal is to be able to perform permission repairs and disk formatting using the diskutil command in Single User Mode. ...
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2answers
1k 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 ...
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1answer
5k views

zpool: pool I/O is currently suspended

I'm using ZFS on OSX and I've zpool which is active and online: NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT WD_1TB 931G 280G 651G 30% 1.00x ONLINE - but I can't ...
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211 views

unrecoverable root partition when used as a second hard drive

What I did with my Macbook, I removed DVD driver ant mounted my old macbook hard drive there. BTW, my old disk was split into 2 partitions: root and data. root partition is where system files and my ...