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Question: Unable to remove unformatted partition from fusion drive

Long story short, I was running bootcamp with Windows 7, removed it awhile back, but would like to set it up again. The issue I am having is that there is a 900GB “unformatted” partition where the Windows partition used to be that I cannot erase/remove/reformat for whatever reason. If I run diskutil from terminal in Recovery, I can see that it is still mapped as Bootcamp, but aside from that I can’t seem to interact with it at all.

iMac, macOS High Sierra (10.13.3)

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Answer:

Excellent. Please remember to backup macOS, Windows and create a Windows System Restore point.

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Mar 12, 2018 5:54 PM in response to CaseyJones24 In response to CaseyJones24

Can you use the Rebuild MBR section of Re: El Capitan has deleted my bootcamp windows partition as a reference and use GDisk to create a MBR? You do not need to modify the GPT in the first section.


The MBR will use GPT 2 3 4.

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Mar 11, 2018 6:10 AM in response to CaseyJones24 In response to CaseyJones24

You can post a text version of the Terminal session using


  • Select and Copy (Command+C) the Terminal output,
  • quit Terminal,
  • start Safari (Get Help Online)
  • Paste (Command+V) the copied output as a reply to this discussion


This will allow me to copy/paste UUIDs. Can you post the text version of


diskutil cs list

Mar 11, 2018 6:10 AM

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Mar 11, 2018 7:44 AM in response to Loner T In response to Loner T

CoreStorage logical volume groups (2 found)

|

+-- Logical Volume Group 1F7BD312-C5FD-486A-97E3-057E8D1528C8

| =========================================================

| Name: Macintosh HD

| Status: Online

| Size: 2220587753472 B (2.2 TB)

| Free Space: 126976 B (127.0 KB)

| |

| +-< Physical Volume 0806F819-EB92-4F34-9650-0FF17B01BC9F

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

| | Index: 0

| | Disk: disk1s2

| | Status: Online

| | Size: 120988852224 B (121.0 GB)

| |

| +-< Physical Volume 4D8E084B-FD3D-4920-AB18-721AAFCCAC52

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

| | Index: 1

| | Disk: disk0s2

| | Status: Online

| | Size: 1298162360320 B (1.3 TB)

| |

| +-< Physical Volume CE751C88-AABF-41EF-8061-217DE3D074A8

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

| | Index: 2

| | Disk: disk0s6

| | Status: Online

| | Size: 801436540928 B (801.4 GB)

| |

| +-> Logical Volume Family 5E58EADB-9506-4CE7-AF72-250E1805D3DC

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

| Encryption Type: None

| |

| +-> Logical Volume 384B6B0D-9683-4300-BFDA-0EF481D9287F

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

| Disk: disk3

| Status: Online

| Size (Total): 2205771890688 B (2.2 TB)

| Revertible: No

| LV Name: Macintosh HD

| Volume Name: Macintosh HD

| Content Hint: Apple_HFS

| LVG Type: Fusion, Sparse

|

+-- Logical Volume Group CF7D7B56-BE06-4286-B8F1-0D5C90CAEE11

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

Name: BOOTCAMP

Status: Online

Size: 899864850432 B (899.9 GB)

Free Space: 899512524800 B (899.5 GB)

|

+-< Physical Volume 0EE01399-C2DA-449D-A540-253088CDDFD3

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

Index: 0

Disk: disk0s4

Status: Online

Size: 899864850432 B (899.9 GB)

Mar 11, 2018 7:44 AM

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Mar 11, 2018 2:49 PM in response to Loner T In response to Loner T

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *3.0 TB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage Macintosh HD 1.3 TB disk0s2

3: Apple_Boot Recovery HD 650.1 MB disk0s3

4: Apple_HFS Untitled 899.9 GB disk0s4

5: Apple_CoreStorage Macintosh HD 801.4 GB disk0s6

6: Apple_Boot Boot OS X 134.2 MB disk0s7


/dev/disk1 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_CoreStorage Macintosh HD 121.0 GB disk1s2

3: Apple_Boot Boot OS X 134.2 MB disk1s3


/dev/disk2 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme +2.1 GB disk2

1: Apple_HFS OS X Base System 2.0 GB disk2s1


/dev/disk3 (internal, virtual):

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD +2.2 TB disk3

Logical Volume on disk1s2, disk0s2, ...

384B6B0D-9683-4300-BFDA-0EF481D9287F

Unencrypted Fusion Drive


/dev/disk4 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +5.2 MB disk4


/dev/disk5 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +524.3 KB disk5


/dev/disk6 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +524.3 KB disk6


/dev/disk7 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +524.3 KB disk7


/dev/disk8 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +2.1 MB disk8


/dev/disk9 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +524.3 KB disk9


/dev/disk10 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +524.3 KB disk10


/dev/disk11 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +12.6 MB disk11


/dev/disk12 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +2.1 MB disk12


/dev/disk13 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +1.0 MB disk13


/dev/disk14 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +2.1 MB disk14


/dev/disk15 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +524.3 KB disk15


/dev/disk16 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +524.3 KB disk16


/dev/disk17 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +1.0 MB disk17


/dev/disk18 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +6.3 MB disk18


/dev/disk19 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +6.3 MB disk19


/dev/disk20 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +524.3 KB disk20


/dev/disk21 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: untitled +2.1 MB disk21


-bash-3.2# diskutil cs list

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group 1F7BD312-C5FD-486A-97E3-057E8D1528C8

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

Name: Macintosh HD

Status: Online

Size: 2220587753472 B (2.2 TB)

Free Space: 126976 B (127.0 KB)

|

+-< Physical Volume 0806F819-EB92-4F34-9650-0FF17B01BC9F

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

| Index: 0

| Disk: disk1s2

| Status: Online

| Size: 120988852224 B (121.0 GB)

|

+-< Physical Volume 4D8E084B-FD3D-4920-AB18-721AAFCCAC52

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

| Index: 1

| Disk: disk0s2

| Status: Online

| Size: 1298162360320 B (1.3 TB)

|

+-< Physical Volume CE751C88-AABF-41EF-8061-217DE3D074A8

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

| Index: 2

| Disk: disk0s6

| Status: Online

| Size: 801436540928 B (801.4 GB)

|

+-> Logical Volume Family 5E58EADB-9506-4CE7-AF72-250E1805D3DC

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

Encryption Type: None

|

+-> Logical Volume 384B6B0D-9683-4300-BFDA-0EF481D9287F

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

Disk: disk3

Status: Online

Size (Total): 2205771890688 B (2.2 TB)

Revertible: No

LV Name: Macintosh HD

Volume Name: Macintosh HD

Content Hint: Apple_HFS

LVG Type: Fusion, Sparse

Mar 11, 2018 2:49 PM

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Mar 11, 2018 3:33 PM in response to CaseyJones24 In response to CaseyJones24

Let us check if there is a MBR on the 3TB disk. Post the output of


sudo fdisk /dev/disk0


If you have an MBR, then using BCA and Install Windows 7 on your Mac using Boot Camp - Apple Support (especially step 11), build a USB Install using Create and Download options. If you already have a USB2 Flash drive-based installer (USB3 will not work), you can boot from it and use the BOOTCAMP partition to install Windows.

Mar 11, 2018 3:33 PM

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Mar 11, 2018 3:44 PM in response to Loner T In response to Loner T

Disk: /dev/disk0 geometry: 97451/255/63 [1565565872 sectors]

Signature: 0xAA55

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

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

1: EE 1023 254 63 - 1023 254 63 [ 1 - 4294967294] <Unknown ID>

2: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

-bash-3.2#

Mar 11, 2018 3:44 PM

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Question: Unable to remove unformatted partition from fusion drive