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

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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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1answer
12k 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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2answers
41 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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2answers
4k 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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0answers
19 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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1answer
215 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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1answer
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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1answer
64 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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1answer
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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1answer
210 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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673 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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3answers
395 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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1answer
3k 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
50 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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0answers
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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1answer
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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50 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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2answers
88 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
17k 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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2answers
55k 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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2answers
521 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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1answer
54 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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1answer
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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34 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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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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144 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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42 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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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
51 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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2answers
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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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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1answer
155 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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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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3answers
8k 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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2answers
125 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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6answers
62k 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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230 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
894 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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1answer
125 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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1answer
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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1answer
111 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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1answer
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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1answer
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 ...
6
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3answers
13k views

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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3answers
332 views

Copying a software RAID 1 to a normal SATA II disk

I need to copy my software RAID 0 (GA-P55-UD5, intel controller) to a normal SATA II disk. I've tried Clonezilla but it won't recognize my RAID volume; just the single disks that are part of it. How ...
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2answers
8k views

System Reserved partition no longer marked as System

I recently posted a question to Super User about accidentally marking my external HDD's partition as Active and how I could undo my accidental mistake. I followed the instructions provided and they ...
56
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2answers
31k views

Why is “/dev/rdisk” about 20 times faster than “/dev/disk” in Mac OS X

According to the rasbery pi documentation, You can load your OS to a flash card with either /dev/disk or /dev/rdisk. rdisk stands for raw disk. /dev/disk is a block level device, why would rdisk ...
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1answer
309 views

Create .img of a disk from command line?

I need to create a .bin or .img of a disk from the command line. I have tried using rawcopy (an .exe that I downloaded from the internet), but that is rubbish. Does anyone know of other ...
0
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1answer
632 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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0answers
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 ...