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

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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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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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18 views

enlarge disk partition El Capitan on vmware

I have a version of El Capitan running on my server. However When I first created it I only assigned 40GB to it. Now I want to make it larger so I added 140GB to the disk size. However I don't seem to ...
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90 views

format disk with APFS, the new apple file system?

Has anyone managed to format an actual real disk with the new apple filesystem APFS in Mac OS Sierra ? the documentation explains how to make a disk image with APFS: hdiutil create -fs APFS -size ...
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2013 21.5" El Capitan iMac has loads of extra disks

My second hand 2013 iMac has been running really slowly. I have already done a complete wipe and reinstall, but that didn't help. trying to get to the bottom of this, and suspecting imminent HDD ...
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7k views

Formatted USB flash drive with Disk Utility on Mac and now it is not recognized on any Mac or Windows machine

I have formatted Canyon CN-MP4A USB flash drive with Disk Utility on Mac and now it is not recognized on any Mac or Windows machine. I have formatted with Disk Utility > drive > Erease > ...
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13k views

Unable to delete or re-partition internal drive using Disk Utility

When using Disk Utility, after booting onto the recovery partition, I can't... Re-partition Delete partitions Repair partitions
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33 views

How to expand my main partition disk space?

I have a VPS (running Ubuntu 16.04 64 bits) I can only access remotely through SSH. Now, my main partition has no more free space while there are around 50GB available on another partition. I'm trying ...
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Difference between ISO, MDS & BIN/CUE disk image formats?

What is the difference between these major disk image formats? Are there any specific advantages / disadvantages for any of them?
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Vhd image of computer reduce unallocated space

I took an image in vhd-format of my entire pc (windows xp). Bith disks are in de one vhd now. Os and data. Afterwards when i try to retrieve this vhd i saw that I have a unallocated space of 300 gb. ...
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15 views

Remove a physical partition on a Mac drive

I wanted to install ubuntu with rEFind on my Mac but I made a mistake during the installation and created a physical drive instead of a logical drive for Linux. My Mac boots fine, but I want to ...
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145 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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26 views

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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2answers
5k views

How do I reformat an unmountable/unrecognised/unformatted USB drive?

How do I reformat an unmountable/unrecognised/unformatted USB drive? It will not mount or format on Windows Vista or OSX Tiger. Disk Utility sees the hardware, but no partition to mount. Testdisk ...
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123 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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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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26 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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226 views

Use sparse image bundle instead of split and concat

Is it possible to use sparse image bundles on the Mac in the same fashion as I would use files split with Terminal's split command? If I show the package contents of the sparse image bundle in the ...
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104 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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533 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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908 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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414 views

is there a remote version of KDirStat

I love KDirStat (or equivalent) but I would like to be able to run it on remote host (which doesn't have X11 installed). Is there anything avaible (and free) which will allow me to get a treemap of ...
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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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82 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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312 views

tool to quickly check how many sectors there are on a external Hard drive - specifically an Ipod - preferably on windows

I've got an old ipod with bad sectors that i'm trying to format with error checking. At this point of time, i'm convinced that its checked more sectors than there are, and the check has been ACTIVELY ...
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31 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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67 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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123 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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3answers
18k views

I want to reformat my external hard disk but disk utility said it could not be unmounted

Hi I wanted to reformat my HP 500GB hard disk to MS DOS (FAT) by using Disk Utility but Disk Utility kept saying that the hard disk cannot be unmounted. I tried googling it but nothing seems to answer ...
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64k views

How do you format a 2 GB SD card to FAT32 (preferably with Disk Utility)?

I've been looking around for a way to do this for a while, but I haven't been able to find the answer. I need to format my 2 GB SD card to FAT-32, but I don't see the option in Disk Utility. If I ...
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522 views

How do I get the Smartware tools working on the HDD itself?

WD My Passport 0740 - WD Smartware I'm posting because I have a problem with the Smartware that was IN the HDD. A friend of mine accidentally deleted the folder Smartware (that I created and placed ...
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72 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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2k 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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39 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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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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174 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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59 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: Meanwhile,...
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1answer
6k views

Create disk image from flash drive

I have a 16 gb flash drive that is formatted using my mac, made bootable, and an OSX installation image put on it. I'd like to keep that drive around so I can do it again in the future, but I don't ...
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2answers
58 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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5k views

Mac OS not allowing for disk partition

I tried adding a disk partition through Disk Utility on a Retina MBP under OS X 10.8.4. It was supposed to be a small, ~20 GB ExFAT partition on a 512 GB disk. For some reason, my disk was ...
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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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165 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 couldn'...
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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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9k views

Why is Disk Utility / diskutil taking so long to zero out data?

I've tried with Disk Utility.app and diskutil at the commandline to zero out a 3TB external USB hard drive, and both work at about 1%/1hr. In Disk Utility.app I am using the 1-pass mode, and with ...
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149 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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66k views

Util to check external USB Drive health? [closed]

I tried a few utils and none of them worked. Either USB wasnt supported or the drive was 'recognized'. I am trying to figure out if i should dump the drive or not. Its only a year old but the warranty ...
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1answer
1k 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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140 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 ...