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How to reset 3TB fusion drive to original partition scheme

When I first purchased my 27" iMac in early 2013 I was unable to use Boot Camp to create a Windows partition (with the version of OSX it shipped with bootcamp was initially disabled but added in an update later). I found a guide online for untangling the Fusion Drive partitions and essentially setting up bootcamp manually.


However, a few days ago I had Windows 8 get screwed up and needed to reformat. I figured that since Apple now updated Mavericks to allow my machine to use bootcamp I would start from scratch and do it properly. The problem is, I cannot seem to get my machine back into a "factory default" setup. I tried removing the CoreStorage volume and letting the Disk Utility tool "reset" the drive, and that -seemed- to work. I had one 3TB partition (according to the GUI) and re-installed OSX. I used Bootcamp to split 2TB for Windows (games) and leave 1TB for Mac. Everything went fine and I restarted into the Win8 installer. However, at this point Windows refused to install to the 2TB partition. I tried formatting it, and delete/create but it said it couldn't install to that partition. The confusing part is that according to Windows I had about 8 partitions (EFI and Recovery I understand but the rest I don't know the reason for).


So now I'm back at the OSX Recovery and this is what "diskutil list" is giving me. Why are there all these 524.3 KB partitions? I can't seem to remove or merge them. I know I should have recorded what the original structure is, but it's too late now. Can someone tell me what the 3TB Fusion Drive *should* look like, and how I can get back to that?


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 *3.0 TB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_CoreStorage 144.2 GB disk1s2

3: Apple_Boot Boot OS X 650.0 MB disk1s3

4: Microsoft Basic Data 2.1 TB disk1s4

5: Apple_CoreStorage 801.4 GB disk1s5

6: Apple_Boot Boot OS X 134.2 MB disk1s6

/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 *1.1 TB disk3

/dev/disk4

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk4

/dev/disk5

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB 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 *6.3 MB disk9

/dev/disk10

#: TYPE NAME SIZE IDENTIFIER

0: untitled *2.1 MB disk10

/dev/disk11

#: TYPE NAME SIZE IDENTIFIER

0: untitled *1.0 MB disk11

/dev/disk12

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk12

/dev/disk13

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk13

/dev/disk14

#: TYPE NAME SIZE IDENTIFIER

0: untitled *1.0 MB disk14



Also including what my CoreStorage structure looks like...


User uploaded file

iMac, OS X Mavericks (10.9.2)

Posted on Apr 17, 2014 7:11 PM

Reply
5 replies

Apr 17, 2014 7:31 PM in response to Hepatitan

Since it won't let me edit my post, here is the text from the picture:


CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group CB783377-EA29-4751-B149-FE6B210648B5

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

Name: Internal Drive

Status: Online

Size: 1066587906048 B (1.1 TB)

Free Space: 12288 B (12.3 KB)

|

+-< Physical Volume 0221F6E1-8EE1-453A-A0EB-B32348EB6E53

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

| Index: 0

| Disk: disk1s2

| Status: Online

| Size: 144162512896 B (144.2 GB)

|

+-< Physical Volume F74A0E21-6435-4CB2-801F-95682108A391

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

| Index: 1

| Disk: disk0s2

| Status: Online

| Size: 120988852224 B (121.0 GB)

|

+-< Physical Volume C2BD0D1A-7EA2-4E36-A3EF-82A7E63BE439

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

| Index: 2

| Disk: disk1s5

| Status: Online

| Size: 801436540928 B (801.4 GB)

|

+-> Logical Volume Family 9DD06D63-96CD-4088-8F0E-061026E68C29

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

Encryption Status: Unlocked

Encryption Type: None

Conversion Status: NoConversion

Conversion Direction: -none-

Has Encrypted Extents: No

Fully Secure: No

Passphrase Required: No

|

+-> Logical Volume A531CC02-E337-473E-8F1F-F462595E1354

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

Disk: disk3

Status: Online

Size (Total): 1060804022272 B (1.1 TB)

Conversion Progress: -none-

Revertible: No

LV Name: Macintosh HD

Volume Name: Macintosh HD

Content Hint: Apple_HFS


Apr 17, 2014 7:44 PM in response to 213JB

This sounds like what I originally did. I deleted the CoreStorage logical volume, went to disk utility, and repaired. Unfortunately when I went to the win8 installer it had about 7-8 partitions and refused to install to the bootcamp partition I created.


Also, why are there all these tiny disks listed? disk4-14 seem like they shouldn't exist. But my biggest question is about disk0-disk3, is that the proper structure for a fusion drive?

How to reset 3TB fusion drive to original partition scheme

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