Can't format former Boot Camp partition

Restore the latest backup. The Restore process will figure it out. You can fix it again using the same steps if necessary.

Ok, thanks very much. I am giving you complete five stars!!!

Thank you.

Sorry if I am disturbing a lot. However, my confidence in you has grown. My system is working fine after yesterdays recovery and formatting. Nevertheless
I am trying to install windows 8.1pro using boot camp, but I cannot scale through again. I keep on receiving this message Error: "We couldn't create a new partition or locate and existing one" can you help me? Any solution towards installing it?

Thanks.

This is what my lists show. I only attempted to install windows 8.1pro once. I have not deleted the partition through boot camp yet.

-bash-3.2# diskutil cs list

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group D58C9A35-0855-4F6F-BED1-D59EAC5AF28C

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

Name: OSX-MacintoshLVG

Status: Online

Size: 839498473472 B (839.5 GB)

Free Space: 0 B (0 B)

|

+-< Physical Volume BEB1745E-9977-4A6F-9511-699A0A46A234

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

| Index: 0

| Disk: disk0s2

| Status: Online

| Size: 120988852224 B (121.0 GB)

|

+-< Physical Volume 0F1676BC-5711-4E4F-8BD1-40001C3B8C04

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

| Index: 1

| Disk: disk1s2

| Status: Online

| Size: 718509621248 B (718.5 GB)

|

+-> Logical Volume Family 085B35F7-851C-4C5C-8C4E-D444A04D4B55

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

Encryption Status: Unlocked

Encryption Type: None

Conversion Status: NoConversion

Conversion Direction: -none-

Has Encrypted Extents: No

Fully Secure: No

Passphrase Required: No

|

+-> Logical Volume 24B4FC14-6C84-44F9-A78E-07502960C541

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

Disk: disk3

Status: Online

Size (Total): 833999994880 B (834.0 GB)

Conversion Progress: -none-

Revertible: No

LV Name: Macintosh HD

Volume Name: Macintosh HD

Content Hint: Apple_HFS

-bash-3.2#

-bash-3.2# 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 718.5 GB disk1s2

3: Apple_Boot Boot OS X 650.0 MB disk1s3

4: Microsoft Basic Data 280.8 GB disk1s4

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: Apple_partition_scheme *1.3 GB disk2

1: Apple_partition_map 30.7 KB disk2s1

2: Apple_HFS OS X Base System 1.3 GB disk2s2

/dev/disk3

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD *834.0 GB disk3

Logical Volume on disk0s2, disk1s2

24B4FC14-6C84-44F9-A78E-07502960C541

Unencrypted Fusion Drive

/dev/disk4

#: TYPE NAME SIZE IDENTIFIER

0: FDisk_partition_scheme *63.9 GB disk4

1: DOS_FAT_32 WININSTALL 63.9 GB disk4s1

/dev/disk5

#: TYPE NAME SIZE IDENTIFIER

0: untitled *5.2 MB disk5

/dev/disk6

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk6

/dev/disk7

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk7

/dev/disk8

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk8

/dev/disk9

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk9

/dev/disk10

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk10

/dev/disk11

#: TYPE NAME SIZE IDENTIFIER

0: untitled *6.3 MB disk11

/dev/disk12

#: TYPE NAME SIZE IDENTIFIER

0: untitled *2.1 MB disk12

/dev/disk13

#: TYPE NAME SIZE IDENTIFIER

0: untitled *1.0 MB disk13

/dev/disk14

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk14

/dev/disk15

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk15

/dev/disk16

#: TYPE NAME SIZE IDENTIFIER

0: untitled *1.0 MB disk16

/dev/disk17

#: TYPE NAME SIZE IDENTIFIER

0: untitled *6.3 MB disk17

-bash-3.2#

1. You have a BC/Windows partition.

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_CoreStorage 718.5 GB disk1s2

3: Apple_Boot Boot OS X 650.0 MB disk1s3

4: Microsoft Basic Data 280.8 GB disk1s4

2. If you interrupt BC Assistant and use Alt/Option key, one likely error is what you see.

3. If BCA failed in creating an MBR, it can result in this error message as well. Please post the output of

fdisk /dev/disk0

fdisk /dev/disk1

Use sudo before these commands, if necessary.

4. You may run into an issue with a 64GB flash device. You may want to use a 8/16GB Flash disk and it should be USB2 not USB3.

Da before yesterday, I tried installing with 8Gb flash disk and I was getting the same error. That's why I decided to try with 64 since I don't have 16.

The terminal result I ran now shows nothing. It reads

-bash-3.2# sudo fdisk/dev/disk0

-bash: sudo: command not found

-bash-3.2# fdisk/dev/disk1

-bash: fdisk/dev/disk1: No such file or directory

-bash-3.2# sudofdisk/dev/disk0

-bash: sudofdisk/dev/disk0: No such file or directory

-bash-3.2# sudo fdisk /dev/disk0

-bash: sudo: command not found

-bash-3.2#

Ok, see the list, it reads

-bash-3.2# 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

-bash-3.2#

-bash-3.2# fdisk /dev/disk1

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

-bash-3.2#

Can you boot normally and download GPT Fdisk from http://sourceforge.net/projects/gptfdisk/ ? BCA failed to create a Hybrid MBR that can be manually created and then you can re-attempt the Windows installation.

ok, I will try that immediately

should I clean up the window partition using boot camp?

You can try that, but use only BCA, nothing else. If you still run into issues, please post back.

I succeeded in removing the partition through BCA. My HDD is normal now. I have also downloaded the gpt fdisk and installed it in the computer. Should I start the normal process of installing windows 8.1 using boot camp as before?

Yes, please try the normal BCA. If it fails, we can use GPT Fdisk to correct it.

I am still getting the same Error: "We couldn't create a new partition or locate and existing one"