Lost Disk Space After Unsuccessful Bootcamp Install

[Kansas Boy]

Hi. New to the forum and looking for some help with the problem. Prior to the install it was 1 TB now shows 814 gb, I tried to format the drive and reinstall the operating system but nothing seems to work. Any ideas what the problem is and how to fix it? Here is the drive and partition list.

/dev/disk0 (internal):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme 24.0 GB disk0

1: EFI EFI 314.6 MB disk0s1

2: Apple_CoreStorage Macintosh HD 23.6 GB disk0s2

3: Apple_Boot Boot OS X 134.2 MB disk0s3


/dev/disk1 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_CoreStorage Macintosh HD 814.4 GB disk1s2

3: Apple_Boot Recovery HD 185.6 GB disk1s3


/dev/disk2 (internal, virtual):

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD +837.0 GB disk2

Logical Volume on disk0s2, disk1s2

AEF718D2-4153-404E-AADC-373D49B76784

Unencrypted Fusion Drive


/dev/disk3 (external, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk3

1: EFI EFI 209.7 MB disk3s1

2: Apple_RAID 499.8 GB disk3s2

3: Apple_Boot Boot OS X 134.2 MB disk3s3

 

[Audit13]

If you are trying to install High Sierra, you need to select view all devices from the HS disk utility, click on the root of the drive, then erase.

 

[Weaselboy]

Unencrypted Fusion Drive

You have a Fusion drive there, so you are going to need to blow off the Fusion drive then start over.

Make a Time Machine backup to an external USB drive. Then option key boot to the Time Machine drive. That will put you in a recovery screen. From there, go to the Utilities menu and open Terminal then enter the command below to kill the Fusion drive.

diskutil cs delete "Macintosh HD"

Now go to this thread and follow my instructions in posts #6 and #14 to rebuild the Fusion drive. At the end of post #14 ignore the part about reinstalling the OS, and instead just click restore in the recovery screen. That will put everything from the Time Machine backup back on the Fusion drive.

 

[mspencer32]

I’m having exactly the same problem. Late 2015 27” iMac 5K with 3.1 TB Fusion drive. I had a failed attempt with boot camp. I partitioned 500GB for it. My total HD space is now 2.61TB. I followed the steps as mentioned above using terminal. I deleted the cs creating two volumes and then recombined. But the two volumes I was left with were 2.5TB AND 120GB. That puts me back to where I started. Is there a way to find out where that space went?

 

[Weaselboy]

From what you are saying here, I think you missed a step. After you delete the Fusion drive you need to use Disk Utility to erase each of the two internal drives. When you do that, select the drive itself at the very top of the left column in Disk Util. That will format each drive back to one large volume. Then rebuild the Fusion drive.

 

[mspencer32]

From what you are saying here, I think you missed a step. After you delete the Fusion drive you need to use Disk Utility to erase each of the two internal drives. When you do that, select the drive itself at the very top of the left column in Disk Util. That will format each drive back to one large volume. Then rebuild the Fusion drive.

I first run the command diskutil cs delete “Macintosh HD”. I’m then left with two drives both labeled Untitled. Upper one is 120GB. Lower one is 2.5TB. Both drives are in the same column directly lined up with each other. So it doesn’t appear as you described. Thank you very much for this fast response!

 

[Weaselboy]

I first run the command diskutil cs delete “Macintosh HD”. I’m then left with two drives both labeled Untitled. Upper one is 120GB. Lower one is 2.5TB. Both drives are in the same column directly lined up with each other. So it doesn’t appear as you described. Thank you very much for this fast response!

If you are on High Sierra you need to check Show All Devices to see the drive. Then pick the very top like in my left shot and erase.

 

[mspencer32]

If you are on High Sierra you need to check Show All Devices to see the drive. Then pick the very top like in my left shot and erase.

View attachment 749451 View attachment 749452

You were right! That was the step I missed. I forgot to reformat both drives before recombining them. It all back to normal. Stellar Job!!! Thanks!