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

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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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2answers
11k views

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

I've been looking around for a way to do this for a while, but haven't been able to find the answer. I need to format my 2GB SD card to FAT-32, but I don't see the option in Disk Utility. If I ...
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3answers
4k 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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1answer
115 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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1answer
87 views

Zerofree never ends. Is it doing anything?

I have been trying to use zerofree to reduce the size of my VM. It worked fine for one filesystem, but the other was mounted on / so it wouldn't let me. Then I figured I could use the 'recovery ...
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Hard Drive Bad Sector marking utility [closed]

I already have Windows XP, During installing Ubuntu(dual boot) the disk drive just stuck up at one place and doesn't seem to move ahead.. Is there a disk bad sector mark utility that just marks these ...
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4answers
6k views

I forgot my encrypted disk password on OS X

My disk is formatted with Mac OS Extended (Journaled, Encrypted). I have a super long and random password. It won't let me paste my password in and I keep manually typing it wrong. There is nothing on ...
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72 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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Snow Leopard doesn't repair permissions, despite showing / saying its fixed them?

Sometime ago, I used carbon copy as I was replacing my hard drive in my Mac Mini running Snow Leopard. Afterwards, on my new drive I had some permission problems. I've tried several times running a ...
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4answers
9k views

How do you access the contents of a mounted DMG drive mounted through hdiutil and diskmout

My external USB drive failed. I made a .dmg image file of the drive using disk utility. Later I was not able to mount the .dmg image. I used terminal hdiutil attach -noverify -nomount name.dmg ...
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809 views

Mac Disk Utility Undo volume scheme change

My sister made a mistake when trying to reformat a hard drive, and buggered up a hard drive with her work on it. She says it happened very quickly which leads me to believe she's actually just ...
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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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5k 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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4answers
4k views

Equivalent of badblocks on Windows or DOS

Is there a utility in DOS or Windows that is as thorough as badblocks on Linux?
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5answers
27k views

Cannot resize OS X partition

I am trying to resize my existing Mac OS Extended partition on my Macbook to install Windows 7 (using steps similar to these), but when ever I go to apply the changes, I get this error: ...
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1answer
3k 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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I looking for clear and concise steps to copy a regular DVD onto my Desktop then burn the copy to a blank DVD

I'm looking to insert a DVD/movie into the disk drive and copy it to my mac in a file formatted in a way that will allow me to insert a blank DVD and burn previously mentioned file onto just mentioned ...
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1answer
244 views

bootable media to take a raw partition image?

I'm looking for a free/commercial application on a bootable media to quickly take raw partition images, preferably with network support for destination. I normally use ddrescue, but initializing a ...
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1answer
31 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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111 views

Remove hidden content from EMTEC 16GB flash drive

I purchased an inexpensive EMTEC 16GB USB flash drive with the intent to using it for a myriad of purposes (initially, as a start-up to install Windows via Bootcamp) and have been unable to remove the ...
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77 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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116 views

Mount Core Storage partitions on image of hard drive created with ddrescue

How do I mount a whole-disk image with an encrypted CoreStorage partition? Update: I found the answer! It was super-simple: hdiutil attach -nomount somePath.img The "nomount" flag is critical ...
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1answer
162 views

disk partition issue in XP

How to partition disk dynamically on Windows XP SP3 (32-bit)? Currently, I only have one drive C, and I want to divide it into Drive C, Drive D and Drive E without data lost.
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What is a good, free, windows disk wiping utility similar in functionality to DBAN?

I have an external ESATA drive I want to do more than zero, (I would rather clobber with random data, such as the U.S. Department of Defense disk wiping policy), that is free as in GNU/OSS. Short ...
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4answers
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How can I resolve the error “MediaKit reports partition (map) too small”?

I am unable to expand my Mac's hard disk. diskutility reports this error: MediaKit reports partition (map) too small How can I resolve this?
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716 views

Can I delete any unwanted file or folder in already written CD or DVD?

I have a DVD which is already written few folders along with files, but now I want to delete few unwanted folders along with files. Is it possible?
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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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1answer
7k views

Mac OSX - Why is /dev/rdisk 20 times faster than /dev/disk

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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2answers
154 views

Safe and fast way to move a partition to begining of disk?

How can I move a partition to beginning of the disk in a fast and safe way?
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2answers
521 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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3answers
794 views

Automated Clonezilla like backups?

I have a laptop with two hard drives; one SSD (64gb) and one HDD (750gb). My SSD contains important files and OS (Windows) files. I would like to store an image of my SSD on my HDD for backup ...
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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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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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203 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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1answer
834 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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3answers
2k 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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645 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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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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3answers
2k views

diskutil command not found in OS X terminal

I am using Mac OS X 10.6.4 and am struggling with the command: diskutil Whenever I type in diskutil the terminal says: -bash: diskutil: command not found Does anyone know what the problem might ...
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1answer
1k 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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1answer
84 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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2answers
1k 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
62 views

Disk Utility not finding disk

I have an external drive that was dropped. It doesn't mount anymore on my OS X box and Disk Utility doesn't see it. Is this the point where I'd need to bring it somewhere for expensive data recover?
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2answers
16k views

Disk Utility Restore causes “Could not validate resource - Invalid Argument”

I have a problem with Disk Utility on Mac OS X 10.6. I have an image of Windows that I would like to use as a bootable volume on a pen drive or external hard drive. The thing is: When I try to ...
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1answer
221 views

Spurious high disk IOrate alerts from remote server

I have a server running on linode. The server is a headless Ubuntu 10.0.4 64 bit installation. I have recently started getting high disk I/O alerts from the server. As far as I know, nothing much has ...
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1answer
11k views

Is there a way to make Windows 7 install .iso onto USB drive from OSX?

I copied my windows 7 cd to a ISO and trying to source the image onto my USB drive from OSX. So far it doesn't seem like it's possible with disk utility. Is there something else I can do to make this ...
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119 views

Screwed drive permissions, share between OSX and Ubuntu

I was looking on how to share files between my OSX and Linux systems, with this in mind, I've formatted the file system to HFS+, disabled journaling in OSX, and finally dumped all my files as ...
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38k 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
6k views

MacBook Air startup disk not found, but verified

I have a MacBook Air that has suddenly stopped booting at all. I booted into recovery mode and see the harddrive fine in Disk Utility. The partition is there as well marked: Mac OS X Base System. I ...
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What are “Missing thread recordng” erros when running fsck -fy?

There is some error reported when I run Disk Utility and verify the root volume on my OS X MacBook. So I boot and CMD-S into the shell mode and run /sbin/fsck -fy. Errors are like: ** Checking ...