Creating a new disk formatting scheme or altering an existing scheme

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My 2011 Macbook Pro won't start - folder with blinking '?'

My Mac will not start up. I went to recovery mode and made a backup of everything on an external drive. Now the Mac only starts up from the external drive. I have OS X 10.10, Yosemite. I tried to ...
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22 views

SSD partitioning fails internally, external OK

I bought a Samsung SSD 850 EVO 250GB for my MacBook Pro 13'' Early 2011, but am unable to install OS X to it. (Yosemite 10.10.3) When installing the SSD internally, OS X doesn't find the drive, and ...
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2answers
127 views

How do I repartition my Mac to get rid of my dual boot setup?

I setup dual boot on my Mac (with Ubuntu) and want to get rid of it. The Disk Util GUI shows me: However attempting to remove the disk0s4 or disk0s5 partitions results in: Could not unmount ...
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14 views

Making a Damaged USB Writable for Drive Genius?

Apologies for being (sort of) a repost from Unable to be Repaired & Further Problems but I had some further questions and I was worried they wouldn't be answered. I followed Froggard's advice and ...
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2answers
24 views

Unable to be Repaired & Further Problems

I'll start off with some information about my USB. I use a SeaGate external hard drive USB with 1 TB. About ~250 gb of it is partitioned and formatted to create a Time-Machine compatible partition. ...
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1answer
41 views

The full size of the Fusion Drive is not available for repartitioning

Any help would be greatly appreciated, I've found so many similar questions but none that match mine exactly. I created a partion on my 2013 iMac in order to test out the Yosemite upgrade. I decided ...
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2answers
39 views

Split Macintosh HD into 3

At the moment I have 1 250GB partition on my mac (Macintosh HD). What I want to do is split my hard drive into 3 partitions. This is because I want to dual boot with Windows 8.1 and make a reserve ...
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1answer
37 views

ExFAT partition on External HDD not showing up on Bootcamp Windows 7

So I partitioned one of my external HDD's for my bootcamp windows, just so I could install some Windows files without having to resize my partition by erasing it and reinstalling. Using disk utility ...
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1answer
22 views

Transfer files between partitions? [duplicate]

After using Boot Camp to install Windows on my Mac, is there any way to transfer files between the two partitions as each is only read only to the other. This is mainly because I have run out of ...
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1answer
38 views

Can someone explain what 'diskutil cs revert' does?

so I was following some instructions to get my windows bootcamp partition to resize in disk utility, because after upgrading to Yosemite I was unable to resize my partition to give one side more space ...
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1answer
20 views

Is it “mandatory” to partition a hard disk for use with Mac OS?

I have bad blocks on the internal Hitachi hard disk in my 2009 era MacBook PRO. I am reformatting the disk with the zero-out option to remap those blocks, but when it comes time to restore the ...
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0answers
6 views

Cannot reclaim partition as free space

I'm trying to reclaim some free space for my main SSD but I'm having problem, the disk utility won't let me expand. Btw I checked for core storage and it said there wasn't any. I can't use ...
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1answer
49 views

Can I get bootcamp to use existing free space on physical disk?

When I installed my Macbook Pro, I had a 1Tb drive. When I formatted and partitioned the drive, I assigned 800Gb for OSX and left 200Gb free. I intended the free 200Gb to hold a Windows installation ...
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3answers
71 views

What are all these partitions on my Mac?

I know the purpose of "EFI", "Boot OS X", and "Recovery HD" partitions. But why are there three different "Macintosh HD" partitions? And should there be two EFI partitions? UPDATE Here is what ...
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0answers
87 views

Mid 2012 15 inch MacBook Pro Yosemite 10.10.3 Grey Screen Startup Freeze w/ Bootcamp

Recently, I tried to log into a windows partition (created with Bootcamp) that I had not been on in a while. When I selected that partition from the boot options screen, it would freeze on a ...
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1answer
94 views

Restoring Fusion Drive after error on partition erase

I think I'm lost and need some help with my Fusion Drive. I have new iMac Retina 5k with 3TB Fusion Drive and preinstalled Yosemite. Things I did so far: I was working on my iMac and had ...
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2answers
96 views

Accidentally used dd on my system drive

As is wanted to write an image to usb stick, I accidentally used my system drive (macintosh hd) as target. Command used: sudo dd if=/dev/zero of=/dev/rdisk1 bs=1024 count=1 Where disk1 was ...
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1answer
38 views

Impossible deactivate the disk

Some time ago I split the hard drive (500gb) in two partitions (250 each), now I have first successfully erased one partition but I still have the second one (Mac HD 2, which runs Mavericks) but I can ...
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0answers
16 views

Is it possible to boot an installed partition through Virtual Machines?

My native Mac OS partition has Mavericks installed. I created another partition and made a fresh install of Yosemite on it. Is it possible to boot the Yosemite partition in a Virtual Machine or is ...
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26 views

How to split fusion drive?

I have MacBook Pro late 2012. Instead DVD I made SSD and Fusion Drive by some instructions from web. As you know it's logical drive and looks like one. But now I need second logical partition for ...
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0answers
44 views

Lost 32GB on my Macintosh HD

I created a 32 GB partition on my Mac where I installed Ubuntu, then I've deleted the partition from disk utility having errors, I restarted my mac and now I can't see the 32 GB space anymore. As you ...
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27 views

Partitioning a Hard Drive using “Logical Core Volume Group”

I have a series of scripts I use for repartitioning hard drives before a DeployStudio reimage. They're really simple: #!/bin/sh diskutil partitionDisk /dev/disk0 GPT JHFS+ Mac\ OS\ 10.10 100g JHFS+ ...
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1answer
20 views

Unable to change volume size on WD My Passport Wireless

I have been trying to partion my WD My Passport External harddrive that has already got data on it. All of the guides I see on the internet tell you to resize the current volume to do so. I don't have ...
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1answer
103 views

How to use Boot Camp Assistant to create a dual OS X, Ubuntu system?

I would like to use Boot Camp Assistant to partition my HD, reserving around 30 GB for Ubuntu. I would then have a dual OS X Yosemite and Ubuntu Linux system. This used to be fairly easy. Boot Camp ...
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32 views

Can't resize external hard drive partition

I remember very clearly back when I formatted the drive, that I chose everything that St. Steve prescribed me to, GPT table, HFS+ partitions, even though other platforms can't write to HFS+. Now, ...
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15 views

Impossible to join free space on main Machintosh HD [duplicate]

I've removed Windows deleting the partition because from BootCamp Assistant it gave me error that couldn't partition the disk. The problem is that now I have 100 GB of free space (which are from the ...
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0answers
27 views

Installed rEFInd Boot Manager, it seems HD re-ogranized

Before I installed rEFInd, I believe there were three partitions to my Mac, disk0, disk1, disk2. Now, when I run in the Command line diskutil list This is what remains: /dev/disk0 #: ...
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1answer
130 views

Apple Hardware Disk Utility Unallocated Space on my Hard Drive

While trying to get bootcamp set up on my macbook pro 15 inch retina 2015 it asked me to partition my mac hard drive. Doing so I partitioned my 1 TB hard drive so that it dedicated 750 gb to mac and ...
0
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1answer
58 views

Cannot boot to OS X using rEFInd

I have installed rEFInd 0.8.7 on my 2015 13" MBP onto another partition however it does not detect OS X. Here are my disk partitions: /dev/disk0 #: TYPE NAME ...
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34 views

Install rEFInd on another partition

I recently tried to install rEFInd onto my Mac but it could not boot into the Ubuntu disk. To uninstall It I formatted my drive and reinstalled OS X along with my backup. To avoid this issue again I ...
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3answers
128 views

Can one create a multi-partition USB Stick with Mavericks, Yosemite, Snow Leopard installers?

Does anyone have any experience creating a multi-partition USB Stick with bootable partitions for installing Mavericks, Yosemite and Snow Leopard? I have a 32Gb stick I'd be perfectly willing to ...
0
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1answer
29 views

Expanding Flash Storage with SDXC

I see on a Macbook Pro, you can expand your current storage space with SDHC or SDXC. Being a Linux user I know you can use RAID to expand storage with 2 disk, so storage looks like 1 HD. However, most ...
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2answers
35 views

Reclaim disk space from old Windows partition?

How do I reclaim the disk space used by my former Windows partition? Clear free space in Disk Utility So I recently removed Windows 7 from my iMac, but Bootcamp didn't let me do it. I used Disk ...
1
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1answer
113 views

New “EFI boot” drive appearing after reverting OS X drive to HFS+

Months ago I performed a clean install of Yosemite, and as you can read elsewhere, drive was formatted as Core Storage. Later on I partitioned and put on Windows 8.1 through Bootcamp. Worked well for ...
2
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0answers
37 views

Lost partition on WD 1.5 TB external drive

My 1.5 TB WD drive failed out of nowhere and now it shows up saying "The disk you inserted was not readable by this computer" This is how it shows up on Disk Utility This is what sudo gpt show ...
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2answers
138 views

Partition my HD with Disk Utility, cannot resize the partition WITHOUT installing Windows. WTF?

I am installing Ubuntu on my Mac to exist as in parallel with OS X Yosemite, version 1010.3. The screenshot looks similar to previous questions, e.g. How can I resize a partition with Disk Utility? ...
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48 views

Disk Utility won't let me create new partitions?

I had a 500gb HDD installed in my Mac running OS X 10.9.5 Mavericks. Being an older drive it started to have some issues, so yesterday I went out and purchased a new 1TB hard drive to replace the ...
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2answers
85 views

Create a new partition after Bootcamp

I've installed Windows with the Boot Camp Assistant Tool but I want to create a third parition to install Ubuntu. On the Mac I can't change the volume size, is not that i receive some error, is just ...
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1answer
44 views

Save data from broken Macbook Pro HDD

I have a broken Macbook Pro HDD with two partitions on it: OS X and Bootcamp. I need to take some files from both partitions: the HDD is now mounted to another PC via. SATA adapter Windows sees the ...
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0answers
32 views

How can i delete a partition in Terminal when I can't simply combine because 'The given partitions are not on the same whole disk'?

Before I partitioned my HD, the only one I had was "Macintosh HD". The partition created one called "Macintosh HD2" I used terminal to erase "Macintosh HD2" somehow, but it returned as "Untitled." ...
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2answers
116 views

Deleted 600mb Partition on Bootcamp-ed MBP while logged into Windows 8 using Disk Manager. No longer boots into OS X

On Mac Book Pro retina ( 2014 ) Mavericks running Boot Camp, one hard drive partitioned to dual boot OS X and Windows 8. While messing on Windows 8 I mistakenly deleted a partition which is now ...
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1answer
61 views

Erase partition without recreating one?

I've got an external USB hdd that I wish to use entirely as a TrueCrypt volume. There was one pre-formatted partition, so I'm trying to erase that with Disk Utility. But no matter what I do or try, ...
0
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1answer
114 views

Reclaim hard drive space from deleted partition and reclaim Apple bootloader

I had my system dual-booted with Ubuntu 14.04. However, I found myself not using it enough to warrant the storage space. I deleted the ubuntu partition and the ubuntu swap partition. However, am now ...
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0answers
37 views

Can't unpartition disk in Yosemite

I am trying to remove partition 6, but the traditional delete and resize are not working? Any ideas how to do this?
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80 views

Cannot resize Macintosh HD

I currently have elementary OS installed alongside Yosemite. When I try to resize Macintosh HD to give space for a Windows installation, I get the "filesystem support for resizing required" error even ...
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2answers
123 views

Boot Camp does not boot after disk cloning

I've got a MacBook5,1, and I replaced the CD drive with a SSD. Then, I made a "DIY fusion drive". Before doing it, I was using the regular setup, with Boot Camp. Then I put the SSD and made the Fusion ...
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1answer
69 views

Can't format o repartition any USB or Flash Drive

I am trying to format an SD card and an USB flash drive. When I use the Disk Utility application I receive the following message: "Couldn't open device" I also tried via terminal and the message I get ...
0
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1answer
68 views

Reformat a Partitioned Mac OS Extended External Disk?

One of my backup disks is full. How can I Erase & Reformat the drive? I use Yosemite OS. The External Hard Drive was formatted as Partitioned Mac OS Extended (case sensitive, Journaled, Encrypted ...
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153 views

Is it safe to convert Core Storage partition to HFS+?

I just got my new Macbook Pro, I tried to make two new partitions using Disk Utility but I could only create one. After googling I found out that I can't create more than one additional partition in ...
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0answers
11 views

Why does disk utility want to erase my RAID 1 set?

I have 2 disks, the first a 2 TB and the second a 5 TB the 2 TB is split into 2 partitions and the 5 TB into 3 partitions with one 2TB RAID0 set, one 1TB RAID1 set and one single 3TB partition. I now ...