Apple's built-in disk management utility for the mac. Erases, formats, and restores volumes and drives.

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26 views

The startup disk cannot be partitioned or restored to a single partition

I have two partitions on my MAC both formatted as Mac OS Extended but only one has macOS on it. When I start the Bootcamp Assistant to install Windows 10 I get the following message: How to fix ...
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1answer
24 views

Macbook Pro does not recognize brand new internal hard drive

I have a 13.3" mid-2012 2.5 GHz Macbook Pro and wanted to upgrade the internal HDD from the factory standard 500GB capacity to a 1TB. I popped the bottom case, discharged any static, undid the screws ...
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1answer
11 views

Grey screen apple logo prohibitory sign etc MacBook 2009

I have an older Mac book that will not boot. I have tried all key commands including fcsk which resulted in a "mach kernel" end result, so nothing worked. I don't have a system install disk (bought ...
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1answer
35 views

Corrupted WD hard disk? Macbook Air says “hard disk not readable”

So one night I finished editing a video and I was so excited that I got up and realised the hard disk was still connected to my Macbook Air. When I stood up, the hard disk was hanging on the Macbook ...
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1answer
28 views

Disk Utility will not repair permissions

I have tried to repair permissions multiple times using Disk Utility.app and also using the command-line diskutil. I always get the same output, so apparently it's not fixing the problem. I've also ...
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3answers
28k views

USB Drive Will Not Mount, Not Listed in Disk Utilities, but Found In System Profiler

I have a Seagate FreeAgent Go drive with the optional docking station. I use it to keep files that I don't access on a regular basis and as a place to do "quick backups" of things like my Paperless ...
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0answers
31 views

OS X Internet Recovery doesn't see SSD drive

I wanted to do a clean install and booted from OS X recovery partition. In disk utility I selected "erase" option. SSD was working correctly before that. Now, if i startup, the only way to proceed is ...
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2answers
5k views

Repartition hard drive with bootcamp on it

I currently have this setup on my Mac- OS X Mavericks 10.9.3, Windows (bootcamp) and a Recovery HD. My question is can I repartition my hard drive to have another partition, using disk utility (resize ...
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1answer
1k views

External disk - Unrecognized file system (-69846)

I have an external storage with 2TB that was working nicely. But since last week, when I unplugged the USB before eject it, the disk is not readable anymore. When I insert USB, I can actually see ...
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1answer
14 views

Lenovo firmware ISO ruined my USB thumb drive - how to fix?

I've never seen this kind of thing before. I have a 32GB thumb drive, which I tried to put a Lenovo BIOS/firmware updater on. It didn't work out, so now I'm trying to format it, but I can't. Mac OS ...
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2answers
2k views

How do I regain unaccessible free space after a failed Boot Camp install on a non-Fusion drive?

Firstly - I know this has been answered, but I am hoping for a more broken down answer, as I am not quite so technically minded, but I can follow instructions! So in summary I have tried to install ...
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2answers
24 views

Can't create a new partition on an external drive's free space

I have a USB2, 500GB external hard drive that I use for Time Machine backups. In order to test something, I created a new partition in the drive, roughly 30GB in size. Once I was done with my tests, I ...
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2answers
3k views

Can't Delete Partition

I created a partition to run Snow Leopard on my computer running El Capitan and no longer need it. I allocated 20GB to that partition. Here's what I've done. I first go into Disk Utility, select my ...
2
votes
1answer
5k views

Fixing a broken hard drive's partition map

I have a drive that is corrupted. Disk utility could not repair the disk, so I attempted to follow some tutorials and repair the partitions using pdisk and testdisk, but things have gone south. Now ...
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2answers
80 views

Unable to recover disk space Mac OS X EI Capitan

I deleted one partition on my mac and now I am not able to recover that space. diskutil list shows below output. Here I see total space is 500 GB and size of Yosemite(installed El Capitan on it) is ...
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1answer
35 views

WD My Passport 0820 USB HFS+ data disk drive partition problem following accidental use of Recovery Assistant

I have edited this post in view of recent developments I have a 2 TB USB Disk used for all my data. I accidentally ran Lion Recovery Disk Assistant on it, instead of my Pen Drive, to make a bootable ...
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1answer
25 views

Needing to run fsck -fy “often” should I send to repair?

Every month I usually give a go to Onyx so I repair all permissions and such. Every time I do that, I get that I need to repair the Disk and I end up having to boot with the single user (in which I ...
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1answer
22 views

External Hard Drive Doesn't Initialize

I have just purchased an 2.5" external hard drive enclosure to accommodate my 2.5" SATA hard disk for use on my El Capitan 10.11.5 MacBook Pro Retina 15 (A1398) computer. However, every time connect ...
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1answer
39 views

Format the External Hard Drive from Hell

I have an external drive that is basically completely screwed. It’s just for backups, and I have redundant backups, so I don’t care about losing the data, I just want to completely format it and get ...
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2answers
3k views

How to Create Images with Yosemite

I have a Mac Mini configured just the way I like it with 10.10.2 installed. I need to deploy that to a bunch of other computers around campus. The usual process for me in the past has been to use an ...
2
votes
1answer
3k views

How to create a Mac bootable gparted or Parted Magic thumb drive?

Is it possible to create a Mac-bootable thumb drive containing gparted or Parted Magic without installing a full Linux distribution? I tried several methods like unetbootin (some blogs suggest this ...
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1answer
28 views

Cannot mount USB with anything, including Disk Utility

I am trying to connect a USB to a Mac I am using, and i cannot seem to. When i plug the device into the Mac, i get an error that reads 'The disk inserted is not readable by the computer.(It contains ...
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0answers
21 views

Transferring Windows 7 OS from my Mac to an external harddrive

So, in disk utility my Windows 7 is under the same internal hard-drive as the Mac OSx, but it shows that my Windows 7 OS is also not-mounted and the format is MS-DOS (FAT). I want to literally just ...
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votes
2answers
7k views

diskutil coreStorage in Lion fails to create a concatenated LVG, error -69886

I would like to create a logical volume group (LVG) with two physical disks. Issue The command: diskutil coreStorage create LVGNAME /dev/disk1 /dev/disk2 returns: Started CoreStorage ...
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10answers
36k views

Disk Utility won't allow me to delete and resize partitions

I'm running OS X 10.9, and I had a linux partition when I updated from 10.8. Since I updated I can't boot on linux, which is no big deal for me. However, I would like to delete the partition that is ...
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10answers
122k views

Unable to Resize Partitions

I have recently created a partition on my macbook air running OS X 10.9, and this was to run install another OS instance (Yes, OS X 10.10 Yosemite, but that is an aside to the query I have) on it. I ...
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0answers
5 views

Cannot make a new partition out of empty disk space

El Capitain on a Macbook Pro 2012. I have more than 100GB of empty (unpartitioned) space on the main hair drive but the Disk Utility does not allow me to partition it. All the controls (partition name ...
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0answers
29 views

Lost access to partition in a Fusion Drive Mac OS 10.11.5

Lost access to the boot drive with name Mac Mini, Logical Volume A6452696-4CBC-4909-81C4-9B636940587A, size 1.1 TB Mac OS X El Capitan 10.11.5 Can't mount it, can't delete the volume in Disk Utility ...
2
votes
1answer
7k views

Boot Camp partition broken and can't be repaired in OS X 10.10.4

Suddenly my Boot Camp partition vanished: not visible in Finder, not visible on startup. In Disk Utility I can see the volume, but it's broken (verification log): Verifying volume "disk0s4" Verifying ...
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2answers
95 views

Hard Drive not showing up in Disk Utility

So I arrived home from school today and wanted to use my iMac, but somehow it wouldn't react. I pressed the power button until it shut down (or crashed...) and rebooted it. After rebooting everything ...
2
votes
1answer
90 views

Switch back to HFS+ from APFS

Recently I heard about new apple file system. Of course I wanted to try it. So I moved all files to one external hard drive for safety... And accidentaly switched it to APFS... How to revert changes? ...
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1answer
2k views

Bootcamp system operating missing error after resizing partition

I resized my partition to increase my bootcamp drive few months ago on Disk Utility on Mac and after that I decieded to have more space on Bootcamp partition so I resized it again by set new size for ...
0
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1answer
27 views

Mounted drive does not show up on Disk Utility, Desktop, Finder Sidebar

I've an external drive that consists of 2 partitions, one NTFS that I use for storing stuff and one Journaled that I use for TimeMachine. I've connected the drive to my Mac but now the NTFS partition ...
3
votes
2answers
4k views

How do I pass the following error message in the Boot Camp Assistant: “Please format the USB drive as single FAT partition.”?

I am running the Boot Camp Assistant on El Capitan. Whenever I reach the third screen, titled "Save Windows Support Software", on which I can select an storage medium to save the Windows support ...
2
votes
2answers
2k views

Orphaned inodes in SSD in MacBook Pro Early 2011

I have a Macbook Pro 15″ Early 2011. Last year I changed the disk to put a new Samsung SSD (Evo). Recently my computer was really slow. I rebooted on the recovery partition, and tested my disk with ...
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0answers
12 views

Cannot expand Macintosh HD after deleting Linux partition

I recently deleted an Ubuntu (ext4) partition on my MacBookPro11,2 in order to reexpand my OS X partition to take up the whole drive again. This is how my partition table looks like at the moment: ...
0
votes
1answer
29 views

Is it possible for only a part of the HD of my MacBook to not work properly?

My MacBook suddenly crashed yesterday. On startup, the computer would always shut down after a few seconds. I used ⌘ Command R to go into Disk Utility from Recovery HD to see what the problem was and ...
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0answers
37 views

Can 'Repair Disk' in Disk Utility harm my data?

I have a MacBook Pro 2011, which suddenly isn't booting properly. When it starts I press Cmd+R to get to Disk Utility, and I used Verify Disk and got: Invalid leaf record count (It should be 2142 ...
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1answer
2k views

Couldn't open device

I can not partition nor use a removable USB disk without file system. I obtained the following informations: sh-3.2# diskutil info disk2 Device Identifier: disk2 Device Node: ...
0
votes
1answer
25 views

Sluggish 2013 21.5" El Capitan iMac

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 ...
1
vote
1answer
52 views

Mac will not boot into OSX after installing windows 10

Please help me I'm completely desparate. I have tried to install Windows 10 and it completely messed up my macbook pro system, I cannot boot into my mac, and it's full with things I desperately need. ...
0
votes
2answers
18k views

external hard drive found only by disk utility, cannot eject or mount

I'm using a Seagate GoFlex that seems to have encountered some trouble. The drive does not appear on the desktop or Finder. I've double checked that Finder > Preferences allows for it to appear in ...
0
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0answers
19 views

How to fix Toshiba external hard drive with missing EFi system partition?

I plugged my sister's Toshiba hard drive into our TV. After I unplugged it and plugged in back to our computer it says that the disk cannot be read so I tried to repair it using the Disk Utility on ...
0
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1answer
24 views

Cannot resize Macintosh HD using (supposedly) available free space

I partitioned my hard drive in order to install Ubuntu, but I now would like to reclaim that space and add it back to my Macintosh HD. I managed to delete the Linux Filesystem and Swap, and Disk ...
0
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1answer
40 views

New uninitialised SSD not showing in Disk Utility

I have bought a new Samsung EVO 850 SSD, it is yet unformatted. I have a SATAI/II to USB3.0 dock which I want to use to get the drive formatted, but it is just not showing up in Disk Utility (Recovery ...
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0answers
19 views

Deep sleep with unmounted SD Card (but inserted)

This question is to clarify the question asked in here. Basically it is regarding using SD Card for extra storage and this question is useful to those who doesn't shut down their laptop often and ...
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1answer
54 views

How do I copy a partition of an Image to a partition of a physical disk?

I finally had a bootable usb key working with a windows 7 install ready to go, when I realized that once the Language selection came up, my Macbook Pro's keyboard and trackpad no longer functioned and ...
2
votes
1answer
3k views

cannot boot. volume disappeared from boot option after Disk Utility (GUI) repair

I have a 13-inch MBP with the latest OS X version. Problem Yesterday, I went to the Recovery Mode and performed Repair on my boot volume. I was not having a problem, but I just wanted to verify and ...
0
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1answer
23 views

MacBook Pro installation failure (recovery, internet, or disk)… what now?

Inherited a MacBook Pro (2010 MacBook6,1 17"). Starts up fine, but wouldn't boot - no operating system found. Hard drive does not appear to be bad (see details below) but I can't seem to get it to ...
2
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3answers
6k views

Cannot format MacBook Air SSD, stuck at waiting for disks to reappear

I have a Macbook Air with 128GB SSD and 4GB RAM with OS X Mavericks. I was using my Mac normally but suddenly Chrome got stuck. So I held down the power button and force-shut down the Mac. When I ...