I have a 1 TB drive that "must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows." When I went to disk utility, it just said that I only have one partition at 850 GB. How can I fix this?
Also, here are some images in case anyone doesn't understand my problem:
iMac, OS X El Capitan (10.11.4)
Run bootcamp. Step 1 is to partition the drive for Windows which is done inside the BootCamp program.
When I run bootcamp, this happens
Oh my! I forgot about this error. I’ve seen it once before and I don’t know if this is the best way to deal with it but what I did was back up the computer, install OS X and then use BootCamp to partition the drive. Then I restored the applications and data with a TimeMachine backup. Note: it doesn’t need to be a TM backup, you could use any other backup program that copies the entire hard drive.
So I need to restore my computer? I already have OS X installed
The time I saw this error the computer had been in use for a while. My colleague (it belonged to him) said he hadn’t done anything more than install a couple programs and save data to it. The drive was 75% empty. I ran Disk Utility and it found no errors. A tech I work with had never seen this error and he guessed, as I did, that there might be a problem with the partition. I misspoke above. I didn’t erase the drive, I deleted the partition which erases the drive. Then I reinstalled the OS.
Did you try to run first aid in disk utility? Also I would reinstall the OS before erasing and reinstalling. It couldn't hurt...but it sounds like you will need to do a backup of your disk and then erase the disk.
Please post the output of the following OSX Terminal commands
diskutil list
diskutil cs list
sudo gpt -vv -r show /dev/disk0
sudo fdisk /dev/disk0
Please enter your password when prompted by the "sudo" commands.
Here are the results of those commands in order
1. Your EFI entry is missing. This is GPT1.
2. You have significant Free Space after Recovery HD. Was BC Assistant and Disk Utility used to try and repair this issue?
3. What tool was used to manipulate the MBR?
4. What is the year/model of your iMac?
I tried to use first aid in disk utility and it didn't do anything. Bootcamp also doesn't do anything, it just tells me I need to have a single partition, though it still lets me make one of the install disks. The only thing I can think of is that I dual booted to linux with rEFind about 2 months ago, but I deleted the partition for it a few weeks ago. The partition for linux was 100 gb. Was I not supposed to that? I heard GParted would be better to remove it but I just got rid of it disk utility. Also, my model is 21.5-inch, Late 2012.
Please boot into Internet Recovery (Command+Opt+R) and run the following command from Utilities -> Terminal.
diskutil repairDisk disk0
Copy the Terminal output using Command+C. Quit Terminal, start Safari (be patient), post the copied output to this discussion.
-bash-3.2# diskutil repairDisk disk0
Repairing the partition map might erase disk0s1, proceed? (y/N) y
Started partition map repair on disk0
Checking prerequisites
Checking the partition list
Adjusting partition map to fit whole disk as required
Checking for an EFI system partition
Problems were encountered during repair of the partition map
Error: -69790: Couldn't find the target disk for this operation
As expected. On a working Mac, this what you normally see.
sudo gpt -vv -r show /dev/disk0
gpt show: /dev/disk0: mediasize=1000555581440; sectorsize=512; blocks=1954210120
gpt show: /dev/disk0: Suspicious MBR at sector 0
gpt show: /dev/disk0: Pri GPT at sector 1
gpt show: /dev/disk0: Sec GPT at sector 1954210119
start size index contents
0 1 MBR
1 1 Pri GPT header
2 32 Pri GPT table
34 6
40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
409640 1448624648 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
1449034288 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
1450303824 1712
1450305536 503904256 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
1954209792 295
1954210087 32 Sec GPT table
1954210119 1 Sec GPT header
Please download GPT Fdisk from https://sourceforge.net/projects/gptfdisk/ so the EFI can be corrected. Once it is corrected, we can move forward with correcting your disk space issue.
Alright, I installed it. What do I have to do to correct the EFI?
Under Normal boot, please post any error messages in the sequence of steps. Do not type anything in the parentheses, (it is informational text).
sudo gdisk /dev/disk0
x (Experts mode)
l (letter L, alignment)
1 (alignment is set to 1 sector)
m (Main menu)
p (Print)
n (New Partition)
1 (GPT 1)
40 (Start)
409639 (End)
EF00 (EFI Part)
p
w (Write)
y (Confirm)
Reboot and test.
I can't partition my Mac to a single volume for bootcamp
