Level 1

5 points

bootcamp partition renamed untitled after booting in MacOS

Can anybody please help me ?

I had succesfully installed Windows 10 on my Macbook Pro and ran Windows already several weeks smoothly.

Unfortunately I did not make a backup of my windows files yet.

Today when I booted to El Capitan to connect my iPad to iTunes Windows gave me a message that it needed repair when I tried to reboot to the bootcamp Windows version.

It did not succeed in repairing and only gave my an advanced options menu.

I booted back into MacOS to find that the windows partition was renamed to 'Untitled' and that no files were visible in Finder.

I than ran Disk Utility and selected First Aid on this partition, I thought this was read only to check for disk errors.

Now when booting from Windows it says no operation system available and Disk Utility shows 496 GB empty space on this partition !

I hope not all my files are lost !!

What can I do to repair the bootcamp partition ? I tried to install setup bootcamp files on USB but cannot boot from USB (does not show the USB drive)

thank you !

Olivier

MacBook Pro, OS X El Capitan (10.11.3), Bootcamp Windows 10

Posted on Apr 5, 2016 11:34 AM

297 replies

Loner T

Level 9

59,536 points

May 9, 2016 6:28 AM in response to ozeegers

Repeat the same steps, but use 0B or 0C instead.

ozeegers Author

Level 1

5 points

May 9, 2016 8:25 AM in response to Loner T

Command (? for help): P

Disk /dev/rdisk0: 1465149168 sectors, 698.6 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): BE924D70-1CD5-4EDB-9B44-947B2100D347

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 1465149134

Partitions will be aligned on 8-sector boundaries

Total free space is 262157 sectors (128.0 MiB)

Number Start (sector) End (sector) Size Code Name

1 40 409639 200.0 MiB EF00 EFI System

2 409640 538608447 256.6 GiB AF00 Apple HFS/HFS+

3 538608448 539877983 619.9 MiB AB00 Recovery HD

4 539877984 1464886983 441.1 GiB 0700 Microsoft basic data

Command (? for help): D

Partition number (1-4): 4

Command (? for help): N

Partition number (4-128, default 4): 4

First sector (34-1465149134, default = 539877984) or {+-}size{KMGTP}: 539877984

Last sector (539877984-1465149134, default = 1465149134) or {+-}size{KMGTP}: 1464886983

Current type is 'Apple HFS/HFS+'

Hex code or GUID (L to show codes, Enter = AF00): 0B

Exact type match not found for type code 000B; assigning type code for

'Apple HFS/HFS+'

Changed type of partition to 'Apple HFS/HFS+'

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING

PARTITIONS!!

Do you want to proceed? (Y/N): y

OK; writing new GUID partition table (GPT) to /dev/rdisk0.

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

Warning: The kernel may continue to use old or deleted partitions.

You should reboot or remove the drive.

The operation has completed successfully.

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

Command (? for help): P

Disk /dev/rdisk0: 1465149168 sectors, 698.6 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): BE924D70-1CD5-4EDB-9B44-947B2100D347

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 1465149134

Partitions will be aligned on 8-sector boundaries

Total free space is 262157 sectors (128.0 MiB)

Number Start (sector) End (sector) Size Code Name

1 40 409639 200.0 MiB EF00 EFI System

2 409640 538608447 256.6 GiB AF00 Apple HFS/HFS+

3 538608448 539877983 619.9 MiB AB00 Recovery HD

4 539877984 1464886983 441.1 GiB AF00 Apple HFS/HFS+

Command (? for help): R

Recovery/transformation command (? for help): O

Disk size is 1465149168 sectors (698.6 GiB)

MBR disk identifier: 0x4DD05DE5

MBR partitions:

Number Boot Start Sector End Sector Status Code

1 1 409639 primary 0xEE

2 409640 538608447 primary 0xAF

3 538608448 539877983 primary 0xAB

Recovery/transformation command (? for help): H

WARNING! Hybrid MBRs are flaky and dangerous! If you decide not to use one,

just hit the Enter key at the below prompt and your MBR partition table will

be untouched.

Type from one to three GPT partition numbers, separated by spaces, to be

added to the hybrid MBR, in sequence: 2 3 4

Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): y

Creating entry for GPT partition #2 (MBR partition #2)

Enter an MBR hex code (default AF):

Set the bootable flag? (Y/N): N

Creating entry for GPT partition #3 (MBR partition #3)

Enter an MBR hex code (default AB):

Set the bootable flag? (Y/N): N

Creating entry for GPT partition #4 (MBR partition #4)

Enter an MBR hex code (default AF): 0B

Set the bootable flag? (Y/N): Y

Recovery/transformation command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING

PARTITIONS!!

Do you want to proceed? (Y/N): y

OK; writing new GUID partition table (GPT) to /dev/rdisk0.

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

Warning: The kernel may continue to use old or deleted partitions.

You should reboot or remove the drive.

The operation has completed successfully.

using 0C it gives me this so I did not continue:

Current type is 'Apple HFS/HFS+'

Hex code or GUID (L to show codes, Enter = AF00): 0C

Exact type match not found for type code 000C; assigning type code for

'Apple HFS/HFS+'

Changed type of partition to 'Apple HFS/HFS+'

Loner T

Level 9

59,536 points

May 9, 2016 3:35 PM in response to ozeegers

Try the following. Please ignore i386 MBR error message.

sudo fdisk -e /dev/disk0

setpid 4

flag 4

Reboot and check.

ozeegers Author

Level 1

5 points

May 9, 2016 11:37 PM in response to Loner T

did this, got no error message...

no partition visible at all, when I change the GPT type back to 07 I see Untitled in finder.

should I try to boot in windows with CD and let windows try to repair ?

Loner T

Level 9

59,536 points

May 10, 2016 4:08 AM in response to ozeegers

Can you check with 0C?

ozeegers Author

Level 1

5 points

May 10, 2016 9:32 AM in response to Loner T

do I need to do GPT and MBR and the fdisk commands with 0C ? so all three ?

ozeegers Author

Level 1

5 points

May 10, 2016 11:41 AM in response to ozeegers

tried it with 0C (repeated all three steps) but no partition visible in finder.....

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

Oliviers-MBP:~ ozeegers$ sudo gdisk /dev/rdisk0

GPT fdisk (gdisk) version 1.0.1

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

Partition table scan:

MBR: hybrid

BSD: not present

APM: not present

GPT: present

Found valid GPT with hybrid MBR; using GPT.

Command (? for help): P

Disk /dev/rdisk0: 1465149168 sectors, 698.6 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): BE924D70-1CD5-4EDB-9B44-947B2100D347

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 1465149134

Partitions will be aligned on 8-sector boundaries

Total free space is 262157 sectors (128.0 MiB)

Number Start (sector) End (sector) Size Code Name

1 40 409639 200.0 MiB EF00 EFI System

2 409640 538608447 256.6 GiB AF00 Apple HFS/HFS+

3 538608448 539877983 619.9 MiB AB00 Recovery HD

4 539877984 1464886983 441.1 GiB 0700 Microsoft basic data

Command (? for help): D

Partition number (1-4): 4

Command (? for help): N

Partition number (4-128, default 4): 4

First sector (34-1465149134, default = 539877984) or {+-}size{KMGTP}:

Last sector (539877984-1465149134, default = 1465149134) or {+-}size{KMGTP}: 1464886983

Current type is 'Apple HFS/HFS+'

Hex code or GUID (L to show codes, Enter = AF00): 0C

Exact type match not found for type code 000C; assigning type code for

'Apple HFS/HFS+'

Changed type of partition to 'Apple HFS/HFS+'

Command (? for help): sudo gdisk /dev/rdisk0

You may need to edit /etc/fstab and/or your boot loader configuration!

Command (? for help): P

Disk /dev/rdisk0: 1465149168 sectors, 698.6 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): BE924D70-1CD5-4EDB-9B44-947B2100D347

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 1465149134

Partitions will be aligned on 8-sector boundaries

Total free space is 262157 sectors (128.0 MiB)

Number Start (sector) End (sector) Size Code Name

1 40 409639 200.0 MiB EF00 EFI System

2 409640 538608447 256.6 GiB AF00 Apple HFS/HFS+

3 538608448 539877983 619.9 MiB AB00 Recovery HD

4 539877984 1464886983 441.1 GiB AF00 Apple HFS/HFS+

Command (? for help): D

Partition number (1-4): 4

Command (? for help): N

Partition number (4-128, default 4): 4

First sector (34-1465149134, default = 539877984) or {+-}size{KMGTP}:

Last sector (539877984-1465149134, default = 1465149134) or {+-}size{KMGTP}: 1464886983

Current type is 'Apple HFS/HFS+'

Hex code or GUID (L to show codes, Enter = AF00): 0C

Exact type match not found for type code 000C; assigning type code for

'Apple HFS/HFS+'

Changed type of partition to 'Apple HFS/HFS+'

Command (? for help): sudo gdisk /dev/rdisk0

You may need to edit /etc/fstab and/or your boot loader configuration!

Command (? for help): P

Disk /dev/rdisk0: 1465149168 sectors, 698.6 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): BE924D70-1CD5-4EDB-9B44-947B2100D347

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 1465149134

Partitions will be aligned on 8-sector boundaries

Total free space is 262157 sectors (128.0 MiB)

Number Start (sector) End (sector) Size Code Name

1 40 409639 200.0 MiB EF00 EFI System

2 409640 538608447 256.6 GiB AF00 Apple HFS/HFS+

3 538608448 539877983 619.9 MiB AB00 Recovery HD

4 539877984 1464886983 441.1 GiB AF00 Apple HFS/HFS+

Command (? for help): W

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING

PARTITIONS!!

Do you want to proceed? (Y/N): Y

OK; writing new GUID partition table (GPT) to /dev/rdisk0.

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

Warning: The kernel may continue to use old or deleted partitions.

You should reboot or remove the drive.

The operation has completed successfully.

Oliviers-MBP:~ ozeegers$ sudo gdisk /dev/rdisk0

GPT fdisk (gdisk) version 1.0.1

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

Partition table scan:

MBR: hybrid

BSD: not present

APM: not present

GPT: present

Found valid GPT with hybrid MBR; using GPT.

Command (? for help): P

Disk /dev/rdisk0: 1465149168 sectors, 698.6 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): BE924D70-1CD5-4EDB-9B44-947B2100D347

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 1465149134

Partitions will be aligned on 8-sector boundaries

Total free space is 262157 sectors (128.0 MiB)

Number Start (sector) End (sector) Size Code Name

1 40 409639 200.0 MiB EF00 EFI System

2 409640 538608447 256.6 GiB AF00 Apple HFS/HFS+

3 538608448 539877983 619.9 MiB AB00 Recovery HD

4 539877984 1464886983 441.1 GiB AF00 Apple HFS/HFS+

Command (? for help): R

Recovery/transformation command (? for help): O

Disk size is 1465149168 sectors (698.6 GiB)

MBR disk identifier: 0x4DD05DE5

MBR partitions:

Number Boot Start Sector End Sector Status Code

1 1 409639 primary 0xEE

2 409640 538608447 primary 0xAF

3 538608448 539877983 primary 0xAB

Recovery/transformation command (? for help): H

WARNING! Hybrid MBRs are flaky and dangerous! If you decide not to use one,

just hit the Enter key at the below prompt and your MBR partition table will

be untouched.

Type from one to three GPT partition numbers, separated by spaces, to be

added to the hybrid MBR, in sequence: 2 3 4

Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): Y

Creating entry for GPT partition #2 (MBR partition #2)

Enter an MBR hex code (default AF):

Set the bootable flag? (Y/N): N

Creating entry for GPT partition #3 (MBR partition #3)

Enter an MBR hex code (default AB):

Set the bootable flag? (Y/N): N

Creating entry for GPT partition #4 (MBR partition #4)

Enter an MBR hex code (default AF): 0C

Set the bootable flag? (Y/N): Y

Recovery/transformation command (? for help): O

Disk size is 1465149168 sectors (698.6 GiB)

MBR disk identifier: 0x4DD05DE5

MBR partitions:

Number Boot Start Sector End Sector Status Code

1 1 409639 primary 0xEE

2 409640 538608447 primary 0xAF

3 538608448 539877983 primary 0xAB

4 * 539877984 1464886983 primary 0x0C

Recovery/transformation command (? for help): W

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING

PARTITIONS!!

Do you want to proceed? (Y/N): Y

OK; writing new GUID partition table (GPT) to /dev/rdisk0.

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

Warning: The kernel may continue to use old or deleted partitions.

You should reboot or remove the drive.

The operation has completed successfully.

Loner T

Level 9

59,536 points

May 10, 2016 1:30 PM in response to ozeegers

These steps will create a conflict between the GPT (AF00) and MBR (0c00).

ozeegers Author

Level 1

5 points

May 10, 2016 10:30 PM in response to Loner T

Can you please give me details on how to get these values correct? Thank you

ozeegers Author

Level 1

5 points

May 11, 2016 10:08 PM in response to ozeegers

I cannot get the GTP to be 0B or 0C because gdisk says it cannot find this code and it sets the type to AF00

Loner T

Level 9

59,536 points

May 12, 2016 5:49 AM in response to ozeegers

Use 0700 for the GPT, but use 0B or 0C to override the MBR part and test.

ozeegers Author

Level 1

5 points

May 12, 2016 9:39 AM in response to Loner T

tested in both cases it shows untitled in finder but no files shown....😕

I only did the first gdisk part to change the GPT to 0700 and then did the fdisk part for 0B and 0C

Loner T

Level 9

59,536 points

May 12, 2016 11:56 AM in response to ozeegers

You can try to use Disk Warrior to TechToolPro (or similar tools) to check if your archives and files can be recovered.

ozeegers Author

Level 1

5 points

May 13, 2016 8:40 AM in response to Loner T

hmm... this is the only thing I get out of Diskwarrior....

Csound1

Level 9

60,063 points

May 13, 2016 9:19 AM in response to ozeegers

DiskWarrior is Mac only

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bootcamp partition renamed untitled after booting in MacOS