Q: Yosemite Upgrade broke bootcamp partition
Guidos-MacBook-Air:~ Guido$ 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 85.0 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
4: Microsoft Basic Data 20.1 GB disk0s4
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD *84.6 GB disk1
Logical Volume on disk0s2
948AB503-78BD-4568-A9A9-3010F2854D67
Unlocked Encrypted
Guidos-MacBook-Air:~ Guido$ diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 25B9905F-C591-422E-93DE-4176AFF7A4E4
=========================================================
Name: Macintosh HD
Status: Online
Size: 84999999488 B (85.0 GB)
Free Space: 6623232 B (6.6 MB)
|
+-< Physical Volume 9C1C1B3A-BE9F-49F5-A18C-223152F45FE8
| ----------------------------------------------------
| Index: 0
| Disk: disk0s2
| Status: Online
| Size: 84999999488 B (85.0 GB)
|
+-> Logical Volume Family D0A03664-59A9-4522-AA5D-0FF8BB3B3E07
----------------------------------------------------------
Encryption Status: Unlocked
Encryption Type: AES-XTS
Conversion Status: Complete
Conversion Direction: -none-
Has Encrypted Extents: Yes
Fully Secure: Yes
Passphrase Required: Yes
|
+-> Logical Volume 948AB503-78BD-4568-A9A9-3010F2854D67
---------------------------------------------------
Disk: disk1
Status: Online
Size (Total): 84641054720 B (84.6 GB)
Conversion Progress: -none-
Revertible: Yes (unlock and decryption required)
LV Name: Macintosh HD
Volume Name: Macintosh HD
Content Hint: Apple_HFS
Guidos-MacBook-Air:~ Guido$ sudo gpt -vv -r show /dev/disk0
WARNING: Improper use of the sudo command could lead to data loss
or the deletion of important system files. Please double-check your
typing when using sudo. Type "man sudo" for more information.
To proceed, enter your password, or type Ctrl-C to abort.
Password:
gpt show: /dev/disk0: mediasize=121332826112; sectorsize=512; blocks=236978176
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 236978175
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 166015624 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
166425264 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
167694800 29959728
197654528 39321600 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
236976128 2015
236978143 32 Sec GPT table
236978175 1 Sec GPT header
Guidos-MacBook-Air:~ Guido$ sudo 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 - 409639] <Unknown ID>
2: AC 1023 254 63 - 1023 254 63 [ 409640 - 166015624] <Unknown ID>
3: AB 1023 254 63 - 1023 254 63 [ 166425264 - 1269536] Darwin Boot
4: 0C 1023 254 63 - 1023 254 63 [ 197654528 - 39321600] Win95 FAT32L
MacBook Air, OS X Yosemite (10.10.1)
Posted on May 3, 2015 3:15 PM
Here is a table with your values
GPT 3 Start | GPT 3 Size | GPT 3 End | NTFS Start | Sector Offset | NTFS Size | NTFS End | Sector Offset (MB) |
| 166425264 | 1269536 | 167694800 | 167696384 | 1584 | 69279737 | 236976120 | 1 |
Leave your Testdisk display and start a new Terminal Window. You need to use the following steps.
If you see any error messages during the following steps, please stop and post back here with the error message. The following steps have values from your Testdisk output (and you can verify) in Steps 7 and 8.
Rebuild GPT4 using start/end offsets
- Sudo gdisk /dev/rdisk0
- P (print the full list of parts)
- D (delete)
- 4 (part 4)
- N (new part)
- 4 (part 4)
- 167696384 - Start offset in bytes (start point for Bootcamp part)
- +69279737 - Size offset (as opposed to End offset)
- 0700 (Windows part type)
- P (print list of all parts just to see what changes will be made)
- W (Write the new GPT)
- Y (Yes! really write the new GPT)
This will delete and re-write the GPT partition info for /dev/disk0s4.
Rebuild MBR to match the new GPT information thus resetting the Hybrid MBR. Use defaults for other questions (like partition codes). The only values that need modifications are the Boot flags and step 10. Accept all other defaults that Gdisk offers.
- Sudo gdisk /dev/disk0
- P (Print list of parts)
- R (Recover)
- H (chooses Hybrid)
- O (print current Hybrid MBR)
- Partitions numbers to be hybridized: 2 3 4
- Y (Good for GRUB question)
- N (part 2 boot flag)
- N (part 3 boot flag)
- Y (part 4 boot flag make NTFS bootable partition)
- O (print current Hybrid MBR)
- W (Write the new MBR)
- Y (Yes! write the new MBR)
- Reboot
Here is sample Q&A for this section. Please notice the Press Enter/Return.
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): Press Enter/Return
Set the bootable flag? (Y/N): N
Creating entry for GPT partition #3 (MBR partition #3)
Enter an MBR hex code (default AB): Press Enter/Return
Set the bootable flag? (Y/N): N
Creating entry for GPT partition #4 (MBR partition #4)
Enter an MBR hex code (default 07): Press Enter/Return
Set the bootable flag? (Y/N): Y
Test 1 - Does Bootcamp Volume show up in Finder?
Test 2 - Can you see files in Bootcamp Volume?
Test 3 - Can you select Bootcamp in System Preferences -> Startup Disk?
Test 4 - If Test 3 is successful, select Bootcamp and Click Restart.
Posted on May 5, 2015 4:59 AM