Mac partition corrupted after creating a new partition

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Mac partition corrupted after creating a new partition

I have a MacBook Pro Retina 13" late 2013 with the last version of Yosemite installed (10.10.4) and Windows 8.1 in BootCamp and everything worked well so far.

One day I needed more space in my Windows so I decided to enlarge the partition, so (in Mac OS) I used the Disk Utility to resize the partition of Mac creating free allocable space. Everything fine so far, both OS worked well.

The problem started here, when I allocated the free space created before.

Now the system doesn't recognize my Mac partition anymore.

When I turn on my laptop it can only run Windows or the EFI Boot.

I've tryed to enter EFI to solve the problem with Disk Utility but I can't solve it with "Repair Disk".

I post some screenshot to make it clear. (Sorry they're in italian)

Obviously the problem is in disk0s2

Apparently the problem is that now disk0s2 is in MS-DOS (FAT) when it should be Mac file system.

If I press on "Repair disk" it shows the error above and says something like: The exit error code in file system check is 8.

Is there a way to repair it? I really don't want to lose my data reinstalling OS X.

Thanks for your help.

I hope I've been clean enough in describing my problem.

MacBook Pro with Retina display, OS X Yosemite (10.10.4)

Posted on Jul 22, 2015 1:41 PM

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Answer 1

Kappy

Level 10

362,017 points

Jul 22, 2015 1:47 PM in response to AleDig92

The problem is that you tried to create more than two partitions. Boot Camp only works with the OS X and Windows partitions. You cannot create more. So you have screwed up your disk partitioning. You need to re-partition the drive back to one OS X partition. Then decide whether you want just a Boot Camp partition or if you want other partitions. You cannot have both.

Install OS X Using Internet Recovery

Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.

Boot to the Internet Recovery HD:

Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.

Partition and Format the hard drive:

Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.

Reinstall OS X: Select Reinstall OS X and click on the Install button. Be sure to select the correct drive to use if you have more than one.

Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

This should restore the version of OS X originally pre-installed on the computer.

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Answer 2

Jul 22, 2015 1:48 PM in response to AleDig92

To resize a Boot camp partition do not use Disk Utility. Use a tool like CampTune. Search this community to find many threads discussing this.

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Answer 3

Loner T

Level 9

59,536 points

Jul 22, 2015 1:51 PM in response to BobTheFisherman

Kappy

BobTheFisherman

Can I try some terminal magic, please, pretty please (with a cherry on top)?

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Answer 4

Loner T

Level 9

59,536 points

Jul 22, 2015 1:52 PM in response to AleDig92

Please post the output of the following Terminal commands.

diskutil list

diskutil cs list

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

The "sudo" commands will prompt for your password, and it will not be echoed back. You may also see a warning about improper use of "sudo" and potential data loss due to "abuse" of the command.

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Answer 5

AleDig92 Author

Level 1

0 points

Jul 22, 2015 2:05 PM in response to Loner T

How can I open the terminal? I've tried with Cmd + S at boot but it just boot in Windows.

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Answer 6

Loner T

Level 9

59,536 points

Jul 22, 2015 2:09 PM in response to AleDig92

You are in Recovery Console. Click on Utilities -> Terminal.

Do not use "sudo" part, because you are already root.

gpt -vv -r show /dev/disk0

fdisk /dev/disk0

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Answer 7

Csound1

Level 9

60,063 points

Jul 22, 2015 2:08 PM in response to Loner T

CMD-S is Single user mode, not Recovery.

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Answer 8

AleDig92 Author

Level 1

0 points

Jul 22, 2015 2:09 PM in response to Kappy

Doesn't this procedure delete all my data in the Mac partition?

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Answer 9

Loner T

Level 9

59,536 points

Jul 22, 2015 2:10 PM in response to AleDig92

AleDig92 wrote:

Doesn't this procedure delete all my data in the Mac partition?

The Terminal commands are read-only. They show your GPT partition table.

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Answer 10

AleDig92 Author

Level 1

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Jul 22, 2015 2:22 PM in response to Loner T

-bash-3.2# diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *251.0 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Microsoft Basic Data 160.7 GB disk0s2

3: Apple_HFS Recovery HD 650.1 MB disk0s3

4: Microsoft Basic Data Dati 43.6 GB disk0s4

5: Microsoft Basic Data BOOTCAMP 45.8 GB disk0s5

/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# diskutil cs list

No CoreStorage logical volume groups found

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

gpt show: /dev/disk0: mediasize=251000193024; sectorsize=512; blocks=490234752

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 490234751

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 313947600 2 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

314357240 1269760 3 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

315627000 520

315627520 85192704 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

400820224 2048

400822272 89411584 5 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

490233856 863

490234719 32 Sec GPT table

490234751 1 Sec GPT header

-bash-3.2# fdisk /dev/disk0

Disk: /dev/disk0 geometry: 30515/255/63 [490234752 sectors]

Signature: 0xAA55

Starting Ending

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

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

1: EE 1023 254 63 - 1023 254 63 [ 1 - 490234751] <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#

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Answer 11

AleDig92 Author

Level 1

0 points

Jul 22, 2015 2:24 PM in response to Loner T

Loner T wrote:

AleDig92 wrote:

Doesn't this procedure delete all my data in the Mac partition?

The Terminal commands are read-only. They show your GPT partition table.

It was referred to Kappy's procedure.

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