Q: Repairing boot camp after OS install 10.10.2
In response to this on another thread. After a reinstall of 10.10.2 my bootcamp partition won't start. (Windows 7). I can see the bootcamp partition in finder, but when i try to boot to it i get "missing boot disk" error.
Please post the output of
1. diskutil list
2. sudo fdisk /dev/<DiskWhereYouHaveInstalledBootcamp>
3. sudo gpt -v -r show /dev/<DiskWhereYouHaveInstalledBootcamp>
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *750.2 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_HFS Macintosh HD 678.5 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
4: Microsoft Basic Data BOOTCAMP 70.8 GB disk0s4
Mikes-MacBook-Pro:~ Mike$ diskutil cs list
No CoreStorage logical volume groups found
Mikes-MacBook-Pro:~ Mike$ sudo fdisk /dev/disk0
Password:
Disk: /dev/disk0 geometry: 91201/255/63 [1465149168 sectors]
Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
1: EE 1023 254 63 - 1023 254 63 [ 1 - 1465149167] <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
Mikes-MacBook-Pro:~ Mike$ sudo gpt -vv -r show /dev/disk0
Password:
gpt show: /dev/disk0: mediasize=750156374016; sectorsize=512; blocks=1465149168
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 1465149167
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 1325164720 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
1325574360 1269544 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
1326843904 138303488 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
1465147392 1743
1465149135 32 Sec GPT table
1465149167 1 Sec GPT header
MacBook Pro, OS X Yosemite (10.10.2), null
Posted on Feb 10, 2015 10:03 AM
Download GPT Fdisk (http://sourceforge.net/projects/gptfdisk/files/) and install it. Run the following steps.
Rebuild MBR to match the new GPT information thus resetting the Hybrid MBR.
Use defaults for other questions (for example Enter an MBR hex code (default AF): AF).
Sudo gdisk /dev/disk0
P (Print list of parts)
R (Recover)
H (chooses Hybrid)
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)
W (Write the new MBR)
Y (Yes! write the new MBR)
Reboot
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 Feb 10, 2015 10:25 AM