Q: Can't format former Boot Camp partition

If you are restoring a full TM backup, it will erase and restore the entire disk. Please try and post if you get any errors when you attempt a restore. If you want to test whether it works or not...

You can erase the  disk using...

diskutil eraseDisk

Usage:  diskutil eraseDisk format name [APM[Format]|MBR[Format]|GPT[Format]]

        MountPoint|DiskIdentifier|DeviceNode

Completely erase an existing whole disk.  All volumes on this disk will be

destroyed.  Ownership of the affected disk is required.

Format is the specific file system name you want to erase it as (HFS+, etc.).

Name is the (new) volume name (subject to file system naming restrictions),

or can be specified as %noformat% to skip initialization (newfs).

You cannot erase the boot disk.

Example: diskutil eraseDisk JHFS+ UntitledUFS disk3

You can format the disk using...

diskutil reformat

Usage:  diskutil reformat MountPoint|DiskIdentifier|DeviceNode

Completely erase an existing volume with the same name and format as the

original.  Ownership of the affected disk is required.

You cannot erase the boot volume, nor can you reformat any device which

does not have a valid file system (instead use diskutil eraseVolume).

I have the same problem and I am stuck i have a 500GB SSD in my MBPRORD 2012 edition and I can't format, resize, or basically use 100GB of space. Here is the information that I get out of terminal running the commands that came from this thread.

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.3 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:          Apple_CoreStorage                         398.4 GB   disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

/dev/disk1

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                  Apple_HFS Macintosh HD           *398.0 GB   disk1

                                 Logical Volume on disk0s2

                                 23A2E3C3-E4B2-4B82-A8D7-C97F322D3325

                                 Unencrypted

All I want to do now is to get back the whole drive back and do a clean installation of Yosemite, which I have already made on a USB drive.

Any help in how to get the partition back and the whole drive again would be greatly appreciated.

Thanks in Advance

Ed

If you use Command+R (local Recovery), can you erase Macintosh HD? Does it show you the full space? Can you erase the drive (not Macintosh HD but the disk itself) via Disk Utility?

If not, use Command+Opt+R (Internet Recovery), reformat the internal SSD and use the Yosemite Installer application to install Yosemite from.

I have tried the Command + R a few times already. I get the same issue that the other user has presented where if you do a DU you will see the empty partition as Free Space and no matter what option you use to format it does nothing and just sits there, I have tried resizing it back but that does not work. I will see if the Command Opt R will do the trick but I have a feeling that I will get the same issue.

To mention the DU shows 398.2 GB instead of the 500GB that is in the workstation.

nope same thing as if i were trying to do it local.

If you use Command+Opt+R and start OSX Terminal, can you use diskutil eraseDisk?

diskutil eraseDisk

Usage:  diskutil eraseDisk format name [APM[Format]|MBR[Format]|GPT[Format]]

        MountPoint|DiskIdentifier|DeviceNode

Completely erase an existing whole disk.  All volumes on this disk will be

destroyed.  Ownership of the affected disk is required.

Format is the specific file system name you want to erase it as (HFS+, etc.).

Name is the (new) volume name (subject to file system naming restrictions),

or can be specified as %noformat% to skip initialization (newfs).

You cannot erase the boot disk.

Example: diskutil eraseDisk JHFS+ UntitledUFS disk3

I Have tried that but because the partition is not active, appears as almost hidden, it will only format as the 390gb both the 500.

Run...

diskutil cs deleteVolume

diskutil cs delete

diskutil eraseDisk

diskutil cs eraseVolume

diskutil: did not recognize coreStorage verb "eraseVolume"; type "diskutil coreStorage" for a list

Tushar-rMBP:~ sharma_tu$ diskutil cs deleteVolume

Usage:  diskutil coreStorage deleteVolume

        lvUUID|MountPoint|DiskIdentifier|DeviceNode

Delete a logical volume. The volume must be unlocked.

Example: diskutil coreStorage deleteVolume 11111111-2222-3333-4444-555555555555

diskutil cs delete

Usage:  diskutil coreStorage delete lvgUUID|lvgName

Delete a CoreStorage logical volume group. All logical volumes will be removed.

Ownership of the affected disk is required.

Josh99Ralla wrote:

 

I was able to fully restore my time machine backup, and now its completely back to normal!

Excellent.

no luck this is what i get when i run the diskutil

diskutil coreStorage deleteVolume 23A2E3C3-E4B2-4B82-A8D7-C97F322D3325

The Core Storage Logical Volume UUID is 23A2E3C3-E4B2-4B82-A8D7-C97F322D3325

Started CoreStorage operation on disk1 Macintosh HD

Unmounting disk1

Error: -69888: Couldn't unmount disk

i am not sure where to go from here

Eddiep56 wrote:

 

i am not sure where to go from here

Please post the output of diskutil cs list.

diskutil cs list

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group 424F703F-A997-4A1C-AB1F-476012076D32

    =========================================================

    Name:         Macintosh HD

    Status:       Online

    Size:         398418030592 B (398.4 GB)

    Free Space:   18919424 B (18.9 MB)

    |

    +-< Physical Volume FAF74C85-084F-46B6-BF98-61E13033441B

    |   ----------------------------------------------------

    |   Index:    0

    |   Disk:     disk0s2

    |   Status:   Online

    |   Size:     398418030592 B (398.4 GB)

    |

    +-> Logical Volume Family C4796B72-C416-4768-8066-F1DED3E1E612

        ----------------------------------------------------------

        Encryption Status:       Unlocked

        Encryption Type:         None

        Conversion Status:       NoConversion

        Conversion Direction:    -none-

        Has Encrypted Extents:   No

        Fully Secure:            No

        Passphrase Required:     No

        |

        +-> Logical Volume 23A2E3C3-E4B2-4B82-A8D7-C97F322D3325

            ---------------------------------------------------

            Disk:                  disk1

            Status:                Online

            Size (Total):          398046789632 B (398.0 GB)

            Conversion Progress:   -none-

            Revertible:            Yes (no decryption required)

            LV Name:               Macintosh HD

            Volume Name:           Macintosh HD

            Content Hint:          Apple_HFS

Assuming that you are in Internet Recovery (not Local Recovery), what happens when you run

sudo diskutil cs delete 424F703F-A997-4A1C-AB1F-476012076D32

diskutil cs delete

Usage:  diskutil coreStorage delete lvgUUID|lvgName

Delete a CoreStorage logical volume group. All logical volumes will be removed.

Ownership of the affected disks is required.

AAfter a quick reboot I redid the original commands and that worked!  Inow have my 500gb drive back. Thanks so much for the help!!!