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

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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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513 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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81 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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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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68 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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3k views

Delete EFI Partition

I run diskutil list and have this schema: /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk1 ...
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38 views

Restoring mac to pre OS install attempt

I recently tried to install the new OS X maverick, but about 4 min into the process it told me my disk needed to be repaired. That I should back up my stuff and restore the drive. I will do that, but ...
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115 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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100 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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3k 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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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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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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144 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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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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691 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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894 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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2k 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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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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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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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 ...
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109 views

Retina MBP won't recognize Archboot flash drive

I'm trying to install Arch on a flash drive. To do so, I'm trying to first get a bootable, "live" version of Arch on the flash drive I'm going to install it on later. I've followed the instructions ...
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155 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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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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302 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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461 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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491 views

Cannot run diskutil, sudo or not

I cannot run diskutil on my brand new Retina Macbook Pro 2012. When I try to run it, (including sudo), the terminal says "command not found". I looked in usr/bin and usr/sbin and could not find ...
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319 views

Frequent Mac lockups due to fsck_hfs

My Macbook Pro (10.6.8) locks up every day at noon for several minutes (and often after sleep). I put 'Activity Monitor' up front right before noon sorted by %CPU, and saw that it ran 'fsck_hfs'. ...
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413 views

OS X 10.7 and 10.8 continuously going corrupt on several machines, disk unable to repair, requires clean install

I'm managing about a dozen iMacs varying in age from 3 years to 6 months. Every iMac has an afterparty 256GB Crucial M4 SSD, which have all been installed since roughly the beginning of the year. ...
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3k views

USB Drive cannot detect in Windows 7

Have you ever plugged in a USB drive or any external device with a hard drive and wondered why you cannot see it in My Computer? I often have, I believe my USB is not broke .. because if I plugin the ...
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179 views

Failed to boot macbook from Ubuntu USB

I am trying to put Ubuntu on my aging Macbook, as my optical drive is dead, I am following this guide to do so via USB. The process seems to go fine in the terminal, but when I boot I only get a ...
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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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81 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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14 views

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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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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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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66 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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38 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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173 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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57 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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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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41 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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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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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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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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712 views

Recover from botched full disk encryption using FileVault2

I decided to enable full disk encryption using FileVault2 in OSX Mountain Lion, but near the end of the encryption process, I get a message telling me that it failed, and that I should disable and ...
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279 views

System Does Not Boot From Various Bootable Recovery Disks

No matter what recovery system I have used, be it Acronis recovery disk or some other recovery disk that is intended for emergency system restoration, my system just stalls but still responds ...
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316 views

How can I create a partition for OSX without erasing other partions on the disk?

I'm trying to install OS Lion on my desktop using uniBeast. I want OSX to be on the same disk as my Windows 7 installation, but the installer's disk utility won't let me create a new partition out of ...
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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 ...