"Missing Operating system_ " After installing Yosemite

Here is the screen shot of disk utility :

As for the command execution, this is the result:

>> No CoreStorage logical volume groups found

Can you post the output of sudo gpt -vv -r show /dev/disk0 ? If you are in Recovery Console, then you do not need the "sudo".

-bash-3.2# gpt -vv -r show /dev/disk0

gpt show: /dev/disk0: mediasize=500107862016; sectorsize=512; blocks=976773168

gpt show: /dev/disk0: Suspicious MBR at sector 0

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

gpt show: /dev/disk0: Sec GPT at sector 976773167

start size index contents

0 1 MBR

1 1 Pri GPT header

2 32 Pri GPT table

34 6

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

409640 857910152 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

858319792 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

859589328 1328

859590656 117182457 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

976773113 22

976773135 32 Sec GPT table

976773167 1 Sec GPT header

-bash-3.2#

What does diskutil list show?

>> No CoreStorage logical volume groups found

Not diskutil cs list but diskutil list. 😉

-bash-3.2# diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage 439.2 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data BOOTCAMP 60.0 GB disk0s4

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: Apple_partition_scheme *1.3 GB disk1

1: Apple_partition_map 30.7 KB disk1s1

2: Apple_HFS OS X Base System 1.3 GB disk1s2

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: untitled *5.2 MB disk2

/dev/disk3

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB 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 *6.3 MB disk8

/dev/disk9

#: TYPE NAME SIZE IDENTIFIER

0: untitled *2.1 MB disk9

/dev/disk10

#: TYPE NAME SIZE IDENTIFIER

0: untitled *1.0 MB disk10

/dev/disk11

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk11

/dev/disk12

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk12

/dev/disk13

#: TYPE NAME SIZE IDENTIFIER

0: untitled *1.0 MB disk13

/dev/disk14

#: TYPE NAME SIZE IDENTIFIER

0: untitled *6.3 MB disk14

-bash-3.2#

Hi Loner T,

first of thanks for all the help you are giving here! I tried to follow the solution you have already posted, but I'm not quite sure if I've got the block sizes correct!

Testdisk output:

TestDisk 7.0-WIP, Data Recovery Utility, December 2014 Christophe GRENIER http://www.cgsecurity.org Disk /dev/disk0 - 2000 GB / 1863 GiB - 3907029168 sectors (RO) Current partition structure: Partition Start End Size in sectors 1 P EFI System 40 409639 409600 [EFI system partition] 2 P Mac HFS 409640 1953534639 1953125000 [Customer] 3 P Mac Boot 1953534640 1954804183 1269544 [Recovery HD] Warning: number of heads/cylinder mismatches 255 (NTFS) != 1 (HD) Warning: number of sectors per track mismatches 63 (NTFS) != 1 (HD) 4 P MS Data 2916796416 3907028991 990232576 [BOOTCAMP]

TestDisk 7.0-WIP, Data Recovery Utility, December 2014 Christophe GRENIER http://www.cgsecurity.org Disk /dev/disk0 - 2000 GB / 1863 GiB - 3907029168 sectors (RO) The harddisk (2000 GB / 1863 GiB) seems too small! (< 2507 GB / 2335 GiB) Check the harddisk size: HD jumpers settings, BIOS detection... The following partitions can't be recovered: Partition Start End Size in sectors > MS Data 3907028991 4897261566 990232576 Mac HFS 3907029124 3908298667 1269544 [ Continue ] NTFS, blocksize=4096, 506 GB / 472 GiB

TestDisk 7.0-WIP, Data Recovery Utility, December 2014 Christophe GRENIER http://www.cgsecurity.org Disk /dev/disk0 - 2000 GB / 1863 GiB - 3907029168 sectors (RO) Partition Start End Size in sectors >P EFI System 40 409639 409600 [EFI] D Mac HFS 409640 1953534639 1953125000 D MS Data 2582536 1954805760 1952223225 D Mac HFS 1953534640 1954804183 1269544 D MS Data 1954805760 3907028984 1952223225 D MS Data 2916796416 3907028991 990232576 D Mac HFS 3905759584 3907029127 1269544 Structure: Ok. Use Up/Down Arrow keys to select partition. Use Left/Right Arrow keys to CHANGE partition characteristics: P=Primary D=Deleted Keys A: add partition, L: load backup, T: change type, P: list files, Enter: to continue FAT32, blocksize=512, 209 MB / 200 MiB

sudo gpt -vv -r show /dev/disk0 output:

➜ ~ sudo gpt -vv -r show /dev/disk0 gpt show: /dev/disk0: mediasize=2000398934016; sectorsize=512; blocks=3907029168 gpt show: /dev/disk0: Suspicious MBR at sector 0 gpt show: /dev/disk0: Pri GPT at sector 1 gpt show: /dev/disk0: Sec GPT at sector 3907029167 start size index contents 0 1 MBR 1 1 Pri GPT header 2 32 Pri GPT table 34 6 40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B 409640 1953125000 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC 1953534640 1269544 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC 1954804184 961992232 2916796416 990232576 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 3907028992 143 3907029135 32 Sec GPT table 3907029167 1 Sec GPT header

Could you tell me with which parameters I should use for the rebuild?

Can you start a new discussion thread and post these on that thread? It will make it easier to track issues separately.

You have the "gap" between GPT3 and GPT4. Can you look for familiar files in the following partition?

D MS Data 1954805760 3907028984 1952223225

You have a CS volume as shown in

2: Apple_CoreStorage 439.2 GB disk0s2

yet diskutil cs list shows no volumes.

It should be rebuilt using command line.

Sure no problem! Here is the new discussion. Also checked the mentioned partition (>D MS Data 1954805760 3907028984 1952223225) and it shows all the root files of the Bootcamp drive, (Windows, Programs, Program Files, Users etc.).

OK, what are the set of commands that I need to do so?

Can you boot into Windows? If yes, I would strongly recommend a Windows backup on an external disk, before the internal disk is manipulated any further. Do you need to save any data from the OSX side?

I can boot into Win but nothing important to back up in it. Mac OS X Yes, I would like to recover my photo library & bunch of other files.

Before the partitions are manipulated further, my suggestion would be to create a DMG (Disk Image) in Recovery console, of the partition, which is corrupted. It will provide a place to look at if it is lost on the disk. Windows also has a utility called diskpart (equivalent of OS X diskutil ) which can be very handy from the Windows side.