Hot answers tagged

34

OK, this isn't too bad. Reboot while holding Command ⌘-S to enter single user mode. When it gives you a prompt, type fsck -fy then press return. it will repair your disk. When it's done, type reboot and try partitioning again.


24

If I understand your question correctly you are trying to resize the volume group or actually one of the volumes within a group. From what I could gather your disk was converted to a CoreStorage Volume. Could you please verify that by issuing the following command in a terminal and check if you get a similar output to the one in the picture: diskutil ...


24

After gaining some experience with CoreStorage volumes, I reworked my first answer to generalize and facilitate it by adding some scenarios and deleting some dispensable steps. Basically there is one undocumented command to resize or expand a CoreStorage volume group and an inherent logical volume: diskutil cs resizeStack LVUUID size The command ...


21

You can recreate the EFI System Partition (ESP) using the command-line gpt tool. It should start at sector 40, and it should be 409600 sectors (exactly 200MiB) long. The GPT entry's type should be C12A7328-F81F-11D2-BA4B-00A0C93EC93B, and if you have a hybrid MBR, the type there should be EE. The format is actually a subset of FAT, not HFS+. You can read the ...


20

Looks like your MacSSD2 partition has been turned into a Core Storage volume. Core Storage is Apple's underlying system for disk encryption - I assume you enabled encryption when you created the partition? You can show the Core Storage volume group using the command diskutil cs list and then delete it using diskutil cs delete <volumegroup-uuid>, where ...


15

The best way to do this is probably to setup /Users as an automounted partition, with all your home directories in the root of that partition. I am going to assume you have already copied over the home directories properly (with permissions enabled). Now you just need to add the volume to /etc/fstab. Assuming the parition is named Users, you add a line like ...


15

Ok, this is written for a 500GB HDD. 4 partitions max, just like every other (bootable) hard-drive. I tried this on 2 MacBook Pros and it works perfectly on both. This tutorial also assumes you have OS X Lion installed. What I want to achieve is to have OS X Lion & Windows 7 installed, with a shared space too. 120 (OSX) 260 (SHARED) 120 (Windows) -...


14

For free, you can use the NTFS-3G driver. In order to use it, you have to install MacFUSE first. In the end, you'll have a prefpane to mount and manage your NTFS drives


13

It's rather complicated, and actually a lot of the complexity is to avoid wasting space; I don't think you can "reclaim" anything without breaking it. Let me start at the beginning: your hard drive (/dev/disk0) has two relevant partitions: Macintosh HD (your regular startup volume), and Recovery HD. Recovery HD is marked in the partition table with the ...


13

If your partition turned into Logical Volume Group (you can't resize or delete Yosemite partition), you can revert partition type with few command line. Open Terminal type diskutil corestorage list Find Yosemite partition UUID string. type diskutil corestorage revert <UUID> Your Yosemite partition is now revert to default partition type. Now, you ...


12

Quick fix: Fake Bootcamp. "I partitioned the free space (that OS X couldn't use) as MS-DOS, Bootcamp Assistant thought it was Windows, and was able to remove this MS-DOS partition and restore Mac OS to a single partition." This is the easiest solution, so try that first. No luck? Long fix: In my case, I couldn't get Disk Utility to create the ...


11

(Before proceeding, please make sure the disk in question is still disk2, you have backups of your data, etc. - that said, the changes here are not particularly dangerous. Read through the whole instructions before doing anything to make sure you understand all the steps.) OK, your partition tables look fine (a valid GPT and a correct protective MBR), so I ...


11

The following diskutil cs resizeStack command is vastly undocumented and as such potentially destructive. There might be an easy way outlined first and a long winding, time consuming hard way. Please backup your Mac OS X before proceeding. The not-as-long-as-expected way: A 2nd computer or an iPhone with the stackexchange credentials to enter the site ...


11

Theoretically everything is fine with your Fusion Drive. Fusion Drives look like this. Disk0 is your SSD with 121 GB and disk1 is your HDD with ~1 TB (~1.121 TB summed up). The larger parts of your SSD (disk0s2) and your HDD (disk1s2) are pooled to a CoreStorage LVG (Fusion Drive: disk3) with a size of 967.8 GB. The rest is reserved for EFIs, a Recovery HD ...


10

This is an older post, but I came across it today and figured I'd share what I found. The 'bless' command seems to make this work. First make sure the disk is mounted, find out which folder it is mounted to, and: sudo bless --folder <mount_path> -label <desired_label> For example: sudo bless --folder "/Volumes/Mac OS X Lion Install ESD" -...


10

I’ve not tried MBR1… but: you can indeed boot Windows 7 and Windows 8 (64-bit versions) in EFI mode off of a Thunderbolt-connected disk. I have a handful of the Buffalo Ministation Thunderbolt2 drives with the original, slow 5400 rpm hard drives replaced with various SSDs, and they work wonderfully3. You can boot off of them by pressing Option during the ...


9

You can't change where each partition starts (i.e. where the top of it is in the partition diagram), only where it ends. But in your case, since you have a free block as large as the partition you want to change, you can work around it (warning, this is untested under Lion, so make sure you have a good backup first): Create a new volume in the blank space ...


9

This is how to fix the bootcamp windows install error: "Windows could not update the computer's boot configuration." Do not try to fix with a workaround - you'll find solutions of people manually selecting their Windows partition during reboot by holding down the OPTION key. This will work, but you are circumventing the way that apple wanted you to install ...


9

I highly recommend completely backing up the machine before attempting this, either using TM with no exclusions set, or better yet, cloning the whole drive using a program like Carbon Copy Cloner. Unmount the Logical Volume: sudo diskutil unmount force /dev/disk1 Remove the Logical Volume Group and all of its contents: sudo diskutil cs deleteLVG ...


9

I had the same issue since the beta and the official release did not solve this issue. In the terminal I had the following output: diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *251.0 GB disk0 1: EFI EFI ...


9

I am astonished about complexity of this problem (see @klanomath answer) and easiness to create it. That's why I tried to play with it and found a work around. My problem was the following: I had 500GB-disk. I created 150GB-Macintosh-HD partition on this disk using Disk Utility, leaving 350GB as a "free space". When I tried to format the free space into ...


9

To be able to create a multi-boot environment you have to revert from a CoreStorage partition layout to a standard partition layout. Start to internet recovery mode by pressing altcmdR while booting. Open Terminal.app in the menubar Utilities → Terminal enter diskutil cs revert LVUUID and hit the ⏎ key. (LVUUID is the Logical Volume UUID. You get it by ...


8

diskutil list In my case I wanted to format the parition as NTFS for installing Windows 7 on it. The last parameter is the partition 4 on first disk. diskutil eraseVolume "Tuxera NTFS" my-ntfs disk0s4


8

This is entirely possible. I use either of both of the following variants depending on what I'm trying to test: Virtual machines You can run OS X 10.7 and newer inside recent versions of Parallels and VMWare Fusion. You can also run the server variants of older OS X versions this way; these older server variants also work on VirtualBox, which is free for ...


8

According to this page: http://support.apple.com/kb/PH11102 If the Encrypt checkbox is available, you can select it to keep your backup disk secure. If the Encrypt checkbox is dimmed, your backup disk doesn’t support encryption. Encryption is available only for Time Capsules and for partitions or disks attached directly to your computer and ...


7

Here is my current solution: boot from OS X DVD - mandatory! open terminal diskutil list umount "/Volumes/Macintosh HD" fsck -f /dev/disk0s2 diskutil resizevolume /dev/disk0s2 100G


7

You can use GParted to achieve this, as it supports HFS+, FAT32 & NTFS resizing.


7

Here is my recipe for a Successful setup of OS X Lion + Bootcamp Windows 7 Ult + Data Partition Ok, so after many, many hours I think I've finally figured out how to successfully install Mac OS X Lion with Windows 7 on a Bootcamp partition AND an 3rd data partition. Here is a screenshot of my setup on my 13" MacBook Pro as it looks at the end of the ...


7

You can add entries in /etc/fstab to prevent volumes from mounting. This is similar to the technique @cksum describes. Here are some example one-liners. They will create an fstab file if it doesn't exist, otherwise they will append. You need admin privileges. Prevent an HFS (Mac) volume named Archive from mounting. If it is mounted manually, it will be ...



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