Can't format former Boot Camp partition

Hi Loner T,

First of all thank you for the help, I have same issue with topic owner, which is Bootcamp partition deleted using Disk Utility below is my terminal result. Mine is 1TB fusion, tried internet recovery and now I'm on Version 10.9.5 instead of Yosemite when i tried to instal Windows 8. I don't mind to start fresh, i've made a time machine backup for 10.9.5 with external hard disk

Johans-iMac:~ Johan$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage 121.0 GB disk0s2

3: Apple_Boot Boot OS X 134.2 MB disk0s3

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_CoreStorage 749.5 GB disk1s2

3: Apple_Boot Recovery HD 650.1 MB disk1s3

4: EFI NO NAME 104.9 MB disk1s4

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD *864.3 GB disk2

Johans-iMac:~ Johan$ diskutil cs list

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group 733DDEBE-CA13-41A5-AEC5-02242FD39B98

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

Name: Macintosh HD

Status: Online

Size: 870502473728 B (870.5 GB)

Free Space: 98304 B (98.3 KB)

|

+-< Physical Volume 938679F7-B1EE-4DCE-BB6A-D98E0438054B

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

| Index: 0

| Disk: disk0s2

| Status: Online

| Size: 120988852224 B (121.0 GB)

|

+-< Physical Volume 7428B963-323E-4320-AB4E-90B0EA52D6C2

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

| Index: 1

| Disk: disk1s2

| Status: Online

| Size: 749513621504 B (749.5 GB)

|

+-> Logical Volume Family 17832D68-EA9B-4661-912A-E310ADF8DC8B

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

Encryption Status: Unlocked

Encryption Type: None

Conversion Status: NoConversion

Conversion Direction: -none-

Has Encrypted Extents: No

Fully Secure: No

Passphrase Required: No

|

+-> Logical Volume 4527AA97-DD06-43D4-9C7D-1D2E850F643C

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

Disk: disk2

Status: Online

Size (Total): 864315506688 B (864.3 GB)

Conversion Progress: -none-

Revertible: No

LV Name: Macintosh HD

Volume Name: Macintosh HD

Content Hint: Apple_HFS

Johans-iMac:~ Johan$ sudo gpt -vv -r show /dev/disk0

Password:

Sorry, try again.

Password:

gpt show: /dev/disk0: mediasize=121332826112; sectorsize=512; blocks=236978176

gpt show: /dev/disk0: PMBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 236978175

start size index contents

0 1 PMBR

1 1 Pri GPT header

2 32 Pri GPT table

34 6

40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

409640 236306352 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

236715992 262144 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

236978136 7

236978143 32 Sec GPT table

236978175 1 Sec GPT header

Johans-iMac:~ Johan$ sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 14751/255/63 [236978176 sectors]

Signature: 0xAA55

Starting Ending

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

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

1: EE 1023 254 63 - 1023 254 63 [ 1 - 236978175] <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

Johans-iMac:~ Johan$

You have about 250GB missing on the 1TB HDD. The EFI "NO NAME" (disk1s4) looks like the MSR partition for a EFI boot Windows. Can you post the output of the gpt and fdisk commands for /dev/disk1, since that disk needs to be fixed?

Johans-iMac:~ Johan$ sudo fdisk /dev/disk1

Password:

Disk: /dev/disk1 geometry: 121601/255/63 [1953525168 sectors]

Signature: 0xAA55

Starting Ending

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

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

1: EE 1023 254 63 - 1023 254 63 [ 1 - 1953525167] <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

Johans-iMac:~ Johan$ sudo gpt -vv -r show /dev/disk1

gpt show: /dev/disk1: mediasize=1000204886016; sectorsize=512; blocks=1953525168

gpt show: /dev/disk1: PMBR at sector 0

gpt show: /dev/disk1: Pri GPT at sector 1

gpt show: /dev/disk1: Sec GPT at sector 1953525167

start size index contents

0 1 PMBR

1 1 Pri GPT header

2 32 Pri GPT table

34 6

40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

409640 1463893792 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

1464303432 1269760 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

1465573192 184

1465573376 204800 4 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

1465778176 487746959

1953525135 32 Sec GPT table

1953525167 1 Sec GPT header

Johans-iMac:~ Johan$

hi loner, ive pasted the result of your request. thank you

ic3johan wrote:

1465573376 204800 4 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

1465778176 487746959

This is roughly about 243+ GB. Can you download GPT Fdisk (http://sourceforge.net/projects/gptfdisk/) which can be used to correct this?

Was your Windows installation using EFI Boot or MBR Boot?

yes correct on your calculation, it is 250gb. I will d/l that when im back home. what the next move?

Installed using bootcamp helper and copy iso from desktop, is that helping?

Thanks a lot for your help

GPT 4 is an EFI (disk1s4) partition. GPT 1 is also an EFI (disk1s1). Usually a disk has a single EFI. Although, it may have an MSR and EFI, both. It is a bit confusing to see this configuration. This can also indicate a Disk Utility failure and the UI version of DU in Yosemite is very buggy.

The intent is to create a GPT 5 which has the start/size of 1465778176/487746959 which will become disk1s5, and then the headers can be checked. If the headers are valid (and NTFS) BCA can be used to do a clean remove of Windows. This will also properly re-build the Fusion drive.

If this method does not work, Internet Recovery, Erase/Restore from TM or manual diskutil CS commands to put it back correctly would be the last resort.

wow a bit loss there, the last resort method sounds easier. if you dont mind, can you give a step by step for both method. i should reward you something on ur help. really do. thaks

Bootcamp disk0s4 gone after Yosemite update is an example of building a GPT entry. It shows a GPT 4 entry, the same steps are used to build GPT 5.

For Erase/re-install see OS X: About OS X Recovery - Apple Support and Mac Basics: Time Machine backs up your Mac - Apple Support.

i've tried internet recovery, the portion of Free Space is still there and can't be reformatted. I've downloaded disk

The first simpler option is to re-create GPT5 and make it an NTFS file system. If it does show up properly as NTFS, then BCA can be used for a 'proper' delete. I have added an explanation for each of the commands in (parentheses).

sudo gdisk /dev/disk1

n (add a new partition)

5 (the next available number is 5)

1465778176 (starting sector of this partition)

+487746959 (size of this partition in 512-byte sectors)

0700 (Partition type is Windows NTFS/MS Data)

p (print the GPT for validation)

w (write the update GPT to disk).

y (confirm the write)

Reboot

This should show you a new disk slice called disk1s5.

sudo dd if=/dev/rdisk1s5 count=1 2>/dev/null | hexdump -C

If this shows 'R.NTFS', then run BCA and try to 'Remove Windows...'.

Please stop and post back if you see any errors.

this the result

Last login: Sat Jan 3 08:49:09 on console

Johans-iMac:~ Johan$ sudo dd if=/dev/rdisk1s5 count=1 2>/dev/null | hexdump -C

Password:

00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|

*

00000200

Johans-iMac:~ Johan$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage 121.0 GB disk0s2

3: Apple_Boot Boot OS X 134.2 MB disk0s3

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_CoreStorage 749.5 GB disk1s2

3: Apple_Boot Recovery HD 650.1 MB disk1s3

4: EFI NO NAME 104.9 MB disk1s4

5: Microsoft Basic Data 249.7 GB disk1s5

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD *864.3 GB disk2

/dev/disk3

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk3

1: EFI EFI 209.7 MB disk3s1

2: Apple_HFS backup 999.9 GB disk3s2

Johans-iMac:~ Johan$ dskutil cs list

-bash: dskutil: command not found

Johans-iMac:~ Johan$ diskutil cs list

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group 733DDEBE-CA13-41A5-AEC5-02242FD39B98

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

Name: Macintosh HD

Status: Online

Size: 870502473728 B (870.5 GB)

Free Space: 98304 B (98.3 KB)

|

+-< Physical Volume 938679F7-B1EE-4DCE-BB6A-D98E0438054B

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

| Index: 0

| Disk: disk0s2

| Status: Online

| Size: 120988852224 B (121.0 GB)

|

+-< Physical Volume 7428B963-323E-4320-AB4E-90B0EA52D6C2

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

| Index: 1

| Disk: disk1s2

| Status: Online

| Size: 749513621504 B (749.5 GB)

|

+-> Logical Volume Family 17832D68-EA9B-4661-912A-E310ADF8DC8B

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

Encryption Status: Unlocked

Encryption Type: None

Conversion Status: NoConversion

Conversion Direction: -none-

Has Encrypted Extents: No

Fully Secure: No

Passphrase Required: No

|

+-> Logical Volume 4527AA97-DD06-43D4-9C7D-1D2E850F643C

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

Disk: disk2

Status: Online

Size (Total): 864315506688 B (864.3 GB)

Conversion Progress: -none-

Revertible: No

LV Name: Macintosh HD

Volume Name: Macintosh HD

Content Hint: Apple_HFS

Johans-iMac:~ Johan$

<a href="http://s289.photobucket.com/user/johan1111/media/6FC228F6-76E4-4727-B55F-B69FAE0 ACE24.jpg.html" target="_blank"><img src="http://i289.photobucket.com/albums/ll228/johan1111/6FC228F6-76E4-4727-B55F-B69FA E0ACE24.jpg" border="0" alt=" photo 6FC228F6-76E4-4727-B55F-B69FAE0ACE24.jpg"/></a>

Can you run BCA and check if you get an option to Remove Windows?

BCA show this

"The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows."

can i just re-format the disk 5 in DU? really tempting 😁