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Questions tagged [disk-utility]

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

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Can't see HD in disk utility in recovery mode, but can in OS

I'm pretty new to Macs. I got an iMac Pro in 2017 (grey one) and about 6 months ago it started giving me occasional folder flashing icon on startup. It also started occasionally forgetting my ...
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7 views

Ejecting external SSD or sparsebundle disk image doesn't complete (macOS 10.14.x)

I use an external SSD for Time Machine. The SATA SSD sits in a dock which is connected via USB3. The SSD mounts correctly and is used by Time Machine correctly. If I eject the SSD from Finder (by ...
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1answer
18 views

8T external HDD failing to format

Disk Utility is failing to format an 8T external hard drive on my iMac. I keep getting an error stating Unable to write to the last block of the device: (see below): How might I troubleshoot this?
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1answer
25 views

Can't resize partition [duplicate]

My Disk Utility is showing me some Weird Stuff. My current startup partition is showing as 155 GB, with (I was shocked to discover) 344 GB of unpartitioned free space: I can try to resize the first ...
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2answers
43 views

I cannot get out of recovery mode (OS X Utilities) by resetting or reinstalling the OS

I bought a used iMac and when I turn it on I am shown the OS X Utilities screen. I would like to install the operating system but I cannot do so. I have tried everything suggested on other questions ...
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54 views

if external disk found by terminal applescript

Hey so MacBooks have this nasty habit of not mounting external disks when plugged in before... reference link the solution is quite simple with terminal eject the disk and the manually unplug replug ...
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1answer
14 views

Cannot Erase a 64Gb exFat SD Card with Disk Utility | OS Mojave

I've got a microSD card in an SD adaptor that I accidentally left in during the Bootcamp installation and now it is formatted as exFat rather than Fat-32. I tried erasing it and changing the format, ...
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24 views

Accidentally overwrote encrypted external drive (Mac OS)

So I was rushed (and being careless) and accidentally copied about 80 MB of a Raspberry PI image (SD card formatted extfs) over my external USB drive (4TB) that was formatted and encrypted (using Disk ...
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14 views

Skipping disk check with diskutil resize?

When running the diskutil resize command, is it possible to skip the disk verification step? While I realise this ordinarily a good idea to run, I'm currently struggling against an apparently ...
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1answer
34 views

Disk utility has no option to expand HFS+ volume?

I'm trying to expand my HFS+ volume (selected in picture) to use adjacent space, but there is no option to do it in disk utility (!) I just resized my APFS partition in order to create the free space,...
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36 views

Interpreting various First Aid error messages

Can someone provide documentation or their own knowledge to interpret the below messages? I've researched this diligently but no post has the same combination of messages that I have. There are 5 ...
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0answers
22 views

Cannot mount external drives or flash drives

I tried multiple file systems and multiple devices, none of them will mount. I also tried looking for fsck (not running), resetting the NVRAM (and restarting the Mac of course) and it still doesn't ...
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1answer
29 views

Transfer time machine backups from unmountable HDD

I am attempting to access time machine backups on an external hard drive that I have, and transfer them over to a new HDD. Both drives are 2TB. The drive with the time machine backups will not mount, ...
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1answer
52 views

After deleting kali linux partition, macOS partition startup Volume type FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF [duplicate]

First of all I know this problem and similar problems have been solved before, but I had tried the solutions from the other posts and I didn’t have luck. I know klanomath has a lot of experience and ...
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1answer
36 views

How to resize my partitions?

I have 3 partitions on my hard drive right now, and none of them are able to be resized (the apply button is greyed out when trying to partition). I also feel like my drives are messed up in some way ...
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1answer
47 views

(Mistakenly) Deleted all partitions except for disk0s2, can't mount or repartition

First of all, I apologize that I cannot remember exactly what version of Mac OS I am running, but I am 99% sure it's Yosemite. I recently tried to delete a second partition I had been using for a ...
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1answer
24 views

Erased both partitions of my hard drive and want to merge them. They show up as two different disks so I cant choose the partition option

External hard drive partitions showing as 2 different disks, can't merge or repartition. I have erased both and want to merge into one. EDIT: I have Reformatted both partitions to Mac OS Extended (...
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2answers
46 views

Merging APFS Containers using the Disk Utility Application

I recently deleted my dual boot from my mac, but I am now left with two partitions that I can't figure out how to merge. I would like it to be normal again with just one container: Macintosh HD. I'm ...
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22 views

My 2TB external drive shows up as 2 separate drives, and I want to merge them together

I have a Seagate Backup Plus 2TB external HD, and it shows up as 2 separate external drives in Disk Utility, rather than 1 external device with 2 partitions. I want to merge these so I just have 1 ...
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1answer
31 views

How to resize main partition to full available physical space?

I had two partitions: Machintosh HD with 250 GB space BOOTCAMP with 750GB space Later my Machintosh HD had a problem where it went into a boot loop. So to recover, I went into recovery, erased the ...
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1answer
27 views

I am trying to clone a 2TB drive that has mac os x 10.6.8 onto a smaller drive but dont know what I am doing

I have a Mac Pro that I cant install an OS onto at the moment because I do not have snow leopard. I do have a bootable 2TB Western Digital drive that comes from an identical Mac Pro that has 10.6.8 ...
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22 views

APFS Container is corrupt beyond what I can find online - but Data Recovery software finds my things just fine?

I've followed guide after guide and nobody on the Internet has gotten errors as simple as I have. I've managed to use gdisk to change the partition type to the APFS it is meant to be, but it still won'...
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2answers
492 views

Mac Pro install disk keeps ejecting itself

I am not that savvy with Macintosh computers so I can't figure out why the install disk keeps ejecting when I attempt to boot from disk by holding down the "C" button or the option button. It is not ...
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0answers
21 views

How do i delete my partitions on my mac? [duplicate]

I have been unable to get rid of all the partitions in my drive, they can't be seen inside of my disk utility and i wondered if anyone could help me. Diskutil list returns: /dev/disk0 (internal): #: ...
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1answer
662 views

diskutil list shows 20 disk partitions, I only know 3, what are the rest?

Following the post FFFFFFFF problem with hybrid partitioned drive, not able to fix with the guide in other topics, diskutil list gives me the following big list of disk partitions, what are the /dev/...
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25 views

Cannot delete or merge old boot camp partition in High Sierra

So i've battled with this for quite some time, look up various topics with various solutions, however i have yet to succeed with merging my partitions into one. I had previously installed windows 10 ...
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1answer
17 views

Lacie External Hardrive doesn't show up on Mac or in Disk utility

My lacie hard drive was making some strange clicking noises when I put it in my mac. I have also tried this in a PC. It now is just not showing up in the devices and also when I try to access it in ...
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1answer
66 views

FFFFFFFF problem with hybrid partitioned drive, not able to fix with the guide in other topics

Like many other uses who reported the same problem, I tried to install and delete Ubuntu in my 13' mid-2014 MBP, messed up and got FFFFFFFF-FFFF-FFFF-FFFFFFFF partition, tried to follow the solutions ...
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1answer
291 views

Can not erase my Mac OS X base system

My Mac won’t boot up it makes the noise but just has a grey screen. When i utility boot the system it does not work and when I internet boot to disc utility it won’t allow me to erase the Mac OS X ...
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0answers
19 views

Enlarge APFS container with free space

The container scheme of my hard drive is the following I have more or less 87 GB free, that are not contained in this list. I have removed the container of size 87 GB with the command sudo ...
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0answers
80 views

mac OS Installer lingers after failed Mojave 10.14.3 to 10.14.4 update

I've worked this problem w Apple Mac L2 across two phone calls lasting a total of 5 hours and escalation to L3 without a possible resolution, hence opening up my search to the world. My ask: What ...
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0answers
20 views

Older Mac (2012) Fails to Boot, any ideas?

Guys I'm running out of steam here... how do I copy files from a hard drive in recovery mode to an external hard drive on an older mac. First few things I did: boot into recovery mode and run the ...
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1answer
21 views

Recover data with file structure HFS+ on Mojave

I'm desperate and trying almost everything. That's what happened. I was having problem with Time Machine. One file was not letting time machine finish the backup. But to discover this took me a while. ...
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1answer
30 views

Completely reset Mojave disk

I’ve got a Mojave installation with an APFS drive. I’ve installed and uninstalled Boot Camp partitions several times over the years, and somehow things have gotten out of sync. I can now see the 500GB ...
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1answer
28 views

Other Volumes issue

I have no idea what previous MacBook Pro owner did, but here is my disk: I've got it with Mojava already and I think it's happened on OS update. Something like wrongly repaired of different file ...
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1answer
52 views

Time Machine partition won't mount

I have an external drive with two partitions, the first of which I use for Time Machine backups. The other day I got a message telling me that my drive had been unplugged without being ejected first (...
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1answer
74 views

Lost space after removing bootcamp

So I removed bootcamp and now there is a partition called "free space" that I can't remove. Here is my output from diskutil list: Here is the screenshot from disk utility showing the partitions: ...
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1answer
51 views

New SSD Fitted but Disk Utility Still Showing Old Disk

My 2013 Mac Mini with 1 TB Fusion drive was starting to run really slowly. I got a brand new 1 TB SSD fitted and am trying to restore from Time Machine, now. The restore can see the Time Machine ...
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1answer
35 views

Does Apple's Disk Utility 'Restore' function make a 'byte for byte' clone?

I've used Apple's Disk Utility to 'restore' a drive with accidentally deleted files. I need to know if this is an exact byte-for-byte clone that I can scan for deleted files on.
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71 views

Bootcamp not enough space [duplicate]

I am trying to install Windows using bootcamp in my Mac (Mojave 10.14.3). However, bootcamp tells me that I do not have enough disk space while in fact I have. I haven't got any local snapshots. In ...
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1answer
50 views

Can't format drive to APFS on older machine prior to 10.13 install

I have a Mid-2012 15" MacBook Pro that I've just put a new SSD into. I didn't format the SSD prior to putting it into the computer, my plan was to boot into "recovery mode" (not sure of Apple's term ...
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1answer
82 views

Why has my hard drive started spinning-up each time I eject it?

When I eject the hard drive, the disk starts to slow down but then the disk starts spinning at full speed about a second later. The hard drive is not mounted but it is still spinning. I’m afraid to ...
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1answer
44 views

unlock macOS encrypted Volume on linux

How can i unlock a Partition that has been created and encrypted using Apples Disk Utility on a linux machine? There are 2 formats one can encrypt Volumes with Disk Utility : CoreStorage encrypted ...
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1answer
45 views

Partition Type: FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF no backup [duplicate]

trying to delete a disk partition, the disks utility has given an error and now the Macintosh HD volume was not in APFS. But of course, being different, does not match anything with mine. It also ...
1
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1answer
43 views

Partition table error in external ARECA RAID

Thanks for trying to help me fix this problem. I have been having trouble with my external RAID, the error message that I got was that I have a partition table error. The RAID contains six 4 TB hard ...
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2answers
100 views

Cannot install Mac OS X Lion due to disk errors

I’m trying to install Mac OS X Lion after accidentally having erased my disk in order to reboot my iMac, which I did without backing it up. On a separate USB drive, I formatted and installed a Lion ...
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0answers
25 views

Blocking Disk Utility? [duplicate]

I'm looking for a way to prevent someone from creating a new partition on my hard drive in order to get around restrictions I've set. I've already tried setting an administrator account to no luck. ...
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0answers
152 views

Disk Utility First Aid Failed: fsroot tree invalid

I tried to run Disk Utility in my iMac. It said that: fsroot tree is invalid How to resolve this issue? Is my HDD going to die? UPDATE: Already tried /sbin/fsck -fy in Single-user mode. Same ...
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0answers
31 views

I can't delete a partition I created on my hard drive

The reason I have came here to post a question is because it seems that looking for the answer doesn't work. After attempting (and failing) to install bootcamp, my disk has for some reason been ...
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1answer
33 views

Macbook Pro mid-2012 Disk Utility First Aid Results Interpretation Help

My MacBook pro mid-2012 has been acting a little odd lately (freezing, losing track of files). I've run first aid in disk utility multiple times, but always get the same notes which suggests it doesn'...