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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38
votes
8answers
65k views

Resizing or expanding a CoreStorage volume

I bought a new SSD with 750 GB and made two partitions: 600 GB and 150 GB. The smaller one was thought to be a Bootcamp partition one day, but to date it was just another unused partition. When I ...
9
votes
4answers
72k views

I think I messed up the Fusion Drive on my 1TB iMac (with BootCamp)

this is a somewhat similar post to this one (Can't create partition on free space with Disk Utility) but not quite... It started with me creating a BootCamp partition (around 145 GB) for Windows ...
7
votes
1answer
18k views

The startup disk cannot be partitioned or restored to a single partition. Windows 10 and Mojave

The startup disk cannot be partitioned or restored to a single partition. The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp ...
8
votes
1answer
4k views

macOS partition startup Volume type FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF

I have encountered a nearly identical issue to the one in this question (and this too: Data Not Backed Up, Partition Type: FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF), but my hard drive's main partition is ...
69
votes
6answers
105k views

How do I get detailed SMART disk information on OS X (Mavericks or later)

I'm trying to get a detailed SMART status report on the drives in my Mac. I'm not talking about "Verified," I'm talking about the detailed report that's about 100 lines long listing all the vital ...
35
votes
10answers
165k 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 ...
20
votes
4answers
33k views

How can I merge primary APFS partition with other empty APFS partition?

Using the latest Macbook Pro with currently High Sierra 10.13.1, I was using bootcamp for a year, and I decided to get rid of the Bootcamp partition this morning. The Bootcamp utility would not let me ...
4
votes
2answers
2k views

What are the purposes and safety to enable the hidden debug menu in Disk Utility?

I'm primarily interested to know whether installation of Lion included the Recovery System. I understand you can enable extra formats and debugging in Disk Utility, using the following commands: ...
2
votes
1answer
2k views

Tried to fix filesystem type: FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF and probably made it worse

I have a MacBook Air 11 inch which I recently tried to install Linux on with a swap partition and a root partition. In my stupidity I used the “disks” program under “try ubuntu now” to delete the ...
28
votes
3answers
150k 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 ...
7
votes
1answer
8k views

How to fix GUID hard drive corrupted to MBR

I am on OS X 10.9.5 with a late 2013 iMac. I have a 3TB hard drive that has an unusual problem. It is a Western Digital 3TB Red WD30EFRX. I formatted it with two partitions, both 1.5TB. One was a ...
3
votes
4answers
2k views

What techniques for disk, volume and file system management are possible with OS X, but troublesome within Disk Utility?

In the past, Disk Utility was the best starting point for the vast majority of disk-related tasks. As technologies within (or possible with) OS X have developed – without equal development of Disk ...
2
votes
1answer
1k views

Disk ejected but still show up in Disk Utility?

I have this external (USB) drive that can't seem to be disconnected correctly. Whenever I eject the drive, it won't disappear from Disk Utility. Afterwards when the drive gets re-connected again, it ...
1
vote
4answers
953 views

El-capitan crashing while booting

Objective: Somehow I want to fix the issue and should be able to login to the El-Capitan without reformating as so many valuable files are there Find what has caused this problem so that I can avoid ...
14
votes
1answer
38k views

Create new partition in unallocated space with diskutil

I have deleted the first partition on my external HD such that it now has 100GB of free space at the beginning of the partition. I'd like to reclaim that space, but Disk Utility doesn't let me create ...
11
votes
2answers
11k views

Can't resize APFS Container: Not enough free space in Container due to APFS limits or tidemarks

When I try to resize my APFS container, I get the following error: Error: -69531: There is not enough free space in the APFS Container for this operation due to APFS limits or APFS tidemarks (perhaps ...
22
votes
3answers
47k views

How to get the “securely erase” function of Disk Utility on El Capitan & Sierra

Up to Yosemite I regularly used Disk Utility with Erase > Security Options... > writes a single pass of zeros over the entire disk... as a simple method to fully check that a disk is fully safe before ...
11
votes
4answers
73k views

How can I resize a partition with Disk Utility?

I have 2 partitions, I reduced the size of one and want to expand the other to fill the now available space. How do I expand the Lion Partition into the empty grey space beneath Macintosh HD ...
8
votes
2answers
7k views

How to fix Disk Utility, About This Mac, and Finder that disagree on hard drive space usage?

Has anyone seen this issue and know how to fix it? Look at the free space reported by running "Get Info" on my hard drive (Macintosh HD) in the Finder, "About This Mac" from the Apple Menu, and Disk ...
4
votes
1answer
3k views

Remove macOS from a APFS container?

I'm interested in taking a look as macOS Mojave but am not willing to install it on my main production machine. However, I do not have another Mac to hand so have found myself upon this guide from ...
6
votes
1answer
4k views

OS volume shows as type 'FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFF' after attempting to delete some Linux partitions—cannot log in

I was unable to just delete the partitions left by an old Linux Mint installation by pressing the '-' button in disk utility. I looked online and read that I could reformat them to a journaled format ...
3
votes
1answer
11k views

Partition type suddenly FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF, drive unmountable

I have two drives inside my MBP, an SSD for the OS and the original HDD for large Data. The HDD has 3 Partitions: My Data (Core Storage volume) 20Gb for Linux 4Gb for Linux Swap Recently I ran ...
7
votes
2answers
2k views

Can the data on an MacBook Pro SSD be recovered after formatting using Disk Utility

My MacBook Pro is going to a new owner and I want to be certain the data is adequately erased on the internal SSD (PCIe flash). There are two Stack Exchange questions/answers that appear to present ...
32
votes
9answers
118k views

External Hard Drive Won't Mount

I've searched and tried a lot of stuff but still can't get it to work. I was able to use my seagate HDD properly last week but now it doesn't mount. I tried plugging it to a PC & another mac, it ...
23
votes
3answers
131k views

What are next steps when fsck reports “could not be repaired after 3 attempts”?

My Mac Book Pro 13.-" doesn´t get past the grey booting screen with the apple and the spinning wheel (The loading bar appears but when it´s done nothing happens) I have 220 GB in one single ...
11
votes
3answers
77k views

Can't create partition on free space with Disk Utility [duplicate]

I have created new partition by selecting free space option and now I can't merge it or recreate it. I have tried to use iPartition to create a new partition on free space but it said I have no ...
28
votes
15answers
292k views

How can I repair a disk that Disk Utility says it can't repair?

I have an external hard-disk with a single Mac OS Extended partition. This disk stopped working couple of days ago. I tried to repair the partition with disk utility but no luck. The error message is ...
9
votes
4answers
79k views

Restore Macintosh HD to its original partition configuration

I seem to have badly botched a Boot Camp installation of Windows 8.1. I used Boot Camp Assistant to create a 200 GB BOOTCAMP partition on my 1 TB Fusion Drive. I then rebooted and failed to install ...
6
votes
4answers
26k views

Recovering data off of a dead hard drive

My hard drive died in my macbook and it no longer will start up. It will not mount in an external enclosure but disk utility is still reading that the hard drive is there, and I tried to repair disk ...
5
votes
1answer
12k views

Can't make more than two partitions

I want to multiboot my MacBook Pro, I'm trying to make partitions but in Disk Utility I can't make my partitions, only can divide by 2? Why? It's a normal SSD not a fusion drive (SSD+HD). Now I'm ...
4
votes
2answers
27k views

Merge partitions with Macintosh HD

This is my diskutil list. I wish to merge Misc (disk0s4) with Macintosh HD (disk0s2) leaving only Macintosh HD (disk0s2). Normally I would use this command to merge the two disks: diskutil ...
8
votes
2answers
5k views

200GB unused, but can't change APFS container size due to minimum requirement

I want to create a partition with a different filesystem but in order to do that I need to resize my APFS container. This container has 292,4 GB used space. Its minimum size is 500,07 GB. This ...
5
votes
1answer
9k views

Resizing dual boot partitions in Yosemite

I have a dual boot Macbook Air with Yosemite and Ubuntu. I would like more space on my Ubuntu partition and need to therefore reduce the size of the Mac partition. I assume this will cause some damage ...
4
votes
1answer
5k views

Extend main APFS partition fails with “target disk is too small for this operation”

/dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *251.0 GB disk0 1: ...
4
votes
3answers
1k views

Unable to increase partition size with subsequent blocking partition

I can't make my main Macintosh HD partition bigger. It's limited by the partition in the middle, which seems to be frozen, I can't move it down to make space for my main partition. Also I can't seem ...
1
vote
1answer
253 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 ...
0
votes
1answer
126 views

How to test hard drive - diskutility reports defective drive as perfectly fine

long story I have an USB drive to copy data between Mac, Windows (personally I don't own any) and PS4 - it is exfat formatted. Recently I noticed my Mac would freeze when I plug in this disc - also ...
26
votes
7answers
97k views

What is the best way to clone a disk between two Macs?

What is the best way to clone a disk between two Macs? I ask this every couple years or so and every time I get the same answer. "Use Carbon Copy Cloner", they say. But the unfortunate fact is that ...
14
votes
2answers
149k views

How can I delete everything from my MacBook Pro before selling it?

I have a Mac that runs Snow Leopard and I intend to upgrade it to Mountain Lion and sell it on ebay. However, I only have one hard-drive, and I'm sure I can't use something in my OS to delete my OS ...
27
votes
9answers
238k views

Unable to format / erase hard drive

I have an external HD that died on me a while ago and I'm trying to see if I can format / erase it to start using it again. The disk does not show up in Finder but I can see it in Disk Utility. When ...
8
votes
7answers
46k views

How to identify and fix files with corrupted / inaccessible disk blocks

I have a late 2011 Macbook Pro, running Mavericks 10.9.2. Its sole HDD is a 750GB drive, formatted with Bootcamp. It's still running reasonably well, but in running a defragment pass on it, I've ...
26
votes
1answer
50k views

How to choose GUID with High Sierra's Disk Utility?

Most often USB flash drives on the market are pre-partitioned under (Windows) Master Boot Record. Until El Capitan a special widget in Disk Utility made it possible to set the partition type to GUID. ...
13
votes
3answers
3k views

Difference between enabling Time Machine's “Encrypt Backups” option, and encrypting from Disk Utility?

I'm setting up Time Machine backups on a new external hard disk. I chose to first encrypt the disk via Disk Utility: But I also see these options: Is there any difference between an "Encrypted" ...
18
votes
4answers
42k views

Why is a secure erase 'not necessary' for SSD's?

I'm about to trade in a 2010 MacBook Pro with an SSD. However, I'm unable to do a Secure Erase from the recovery disk (as I used to do with mechanical hard drives before selling or giving away a ...
7
votes
2answers
37k views

How do I change a disk partition map scheme from MBR to GUID Partitions Table?

I just finished the huge download of Mac OS X Lion, started the installer, and now I have a problem. The installer says that I must have the GUID-Partitions Table Scheme. The problem is that when I ...
7
votes
2answers
22k views

installation stuck in a loop due to damaged HD

Right off the bat I'll admit it was stupid to jump into trying to install a new version of OS X to the only partition without having taken adequate precautions (no backups or recovery disks), but ...
2
votes
2answers
5k 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 ...
6
votes
2answers
14k views

Remove Ubuntu and grow Mac partition

I'm new to the whole Mac world, and the first thing I did when I got my MacBook Air 2015 was I installed Ubuntu, but have regretted it now and want to remove it and get my space back into the Mac ...
4
votes
1answer
5k views

Resizing Mac OS partition - macOS High Sierra

Hi I am having issues trying to resize my Mac OS partition, I previously had a very large recovery partition almost 100gb as a result of removing my linux installation, I since resized this to 650mb. ...
3
votes
1answer
3k views

Partition on HFS+ external drive: “Invalid number of allocation blocks”, file system check exit code 8. Unable to repair, even in recovery mode

As the title says, I'm getting the error "Invalid number of allocation blocks" on a particular HFS+ partition of an external drive. I am unable to repair, even in recovery mode. Log results when I ...

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