User profile for user: Evanisamused
Evanisamused Author
User level: Level 1
8 points

Making bootcamp bootable after it's already been installed.

Hello,


I have bootcamp installed on a second hard drive in my 2011 MacBook Pro.


Currently, Windows 10 is installed after upgrading from Windows 7. Everything was working fine until I tried to add Linux as well. Once Linux was installed, I got "missing operating system" whenever I tried to boot into Windows. I've since removed Linux and my Bootcamp partition is still intact with all the files visible through the OS X side. However, I can't boot into Windows. If I restart holding option, there is no drive for Windows. However, if I select Windows/Bootcamp in startup disk while still in OS X it loads but shows "no bootable device -- Insert bootable disk and press any key."


Is is possible for me to create just the bootable volume for the Bootcamp/Windows partition without having to remove the partition entirely and start from scratch?

MacBook Pro, OS X El Capitan (10.11.2)

Posted on Sep 5, 2016 10:35 AM

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13 replies
User profile for user: Evanisamused
Evanisamused Author
User level: Level 1
8 points

Sep 5, 2016 11:35 AM in response to Evanisamused

Last login: Mon Sep 5 11:35:27 on console

evan-macbook-pro:~ evan$ diskutil list

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *240.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh SSD 233.5 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Apple_HFS untitled 200.0 MB disk0s4

5: Apple_HFS untitled 5.3 GB disk0s5

/dev/disk1 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *320.1 GB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_HFS Recovery HD 650.0 MB disk1s2

3: Microsoft Basic Data BOOTCAMP 260.0 GB disk1s3


evan-macbook-pro:~ evan$ diskutil cs list

No CoreStorage logical volume groups found


Disk0s4 and Disk 0s5 are empty and I'm trying to get rid of them but that's a separate issue.


Thanks

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User profile for user: Evanisamused
Evanisamused Author
User level: Level 1
8 points

Sep 5, 2016 11:52 AM in response to Loner T

evan-macbook-pro:~$ sudo fdisk /dev/disk1

Disk: /dev/disk1 geometry: 38913/255/63 [625142448 sectors]

Signature: 0xAA55

Starting Ending

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

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

1: EE 1023 254 63 - 1023 254 63 [ 1 - 625142447] <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

evan--macbook-pro:~$ sudo dd if=/dev/disk1s3 count=1 2>/dev/null | hexdump -C

evan-macbook-pro:~$ sudo gpt -vv -r show /dev/disk1

gpt show: /dev/disk1: mediasize=320072933376; sectorsize=512; blocks=625142448

gpt show: /dev/disk1: PMBR at sector 0

gpt show: /dev/disk1: Pri GPT at sector 1

gpt show: /dev/disk1: Sec GPT at sector 625142447

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 115650720

116060360 1269536 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

117329896 24

117329920 507811840 3 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

625141760 655

625142415 32 Sec GPT table

625142447 1 Sec GPT header


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User profile for user: Loner T
Loner T
User level: Level 9
59,536 points

Sep 5, 2016 3:02 PM in response to Evanisamused

Evanisamused wrote:


evan--macbook-pro:~$ sudo dd if=/dev/disk1s3 count=1 2>/dev/null | hexdump -C

Was there any output from this command?



evan-macbook-pro:~$ sudo gpt -vv -r show /dev/disk1

gpt show: /dev/disk1: mediasize=320072933376; sectorsize=512; blocks=625142448

gpt show: /dev/disk1: PMBR at sector 0

gpt show: /dev/disk1: Pri GPT at sector 1

gpt show: /dev/disk1: Sec GPT at sector 625142447

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 115650720

116060360 1269536 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

117329896 24

117329920 507811840 3 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

625141760 655

625142415 32 Sec GPT table

625142447 1 Sec GPT header


There is about 60Gb between GPT1 and GPT2. What type of partitioning activity took place on this disk?

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User profile for user: Evanisamused
Evanisamused Author
User level: Level 1
8 points

Sep 5, 2016 4:20 PM in response to Loner T

This is the output from that command

00000000 eb 52 90 4e 54 46 53 20 20 20 20 00 02 08 00 00 |.R.NTFS .....|

00000010 00 00 00 00 00 f8 00 00 3f 00 ff 00 00 50 fe 06 |........?....P..|

00000020 00 00 00 00 80 00 80 00 ff 87 36 1e 00 00 00 00 |..........6.....|

00000030 00 00 0c 00 00 00 00 00 02 00 00 00 00 00 00 00 |................|

00000040 f6 00 00 00 01 00 00 00 69 7c d6 b6 a4 d6 b6 9e |........i|......|

00000050 00 00 00 00 fa 33 c0 8e d0 bc 00 7c fb 68 c0 07 |.....3.....|.h..|

00000060 1f 1e 68 66 00 cb 88 16 0e 00 66 81 3e 03 00 4e |..hf......f.>..N|

00000070 54 46 53 75 15 b4 41 bb aa 55 cd 13 72 0c 81 fb |TFSu..A..U..r...|

00000080 55 aa 75 06 f7 c1 01 00 75 03 e9 dd 00 1e 83 ec |U.u.....u.......|

00000090 18 68 1a 00 b4 48 8a 16 0e 00 8b f4 16 1f cd 13 |.h...H..........|

000000a0 9f 83 c4 18 9e 58 1f 72 e1 3b 06 0b 00 75 db a3 |.....X.r.;...u..|

000000b0 0f 00 c1 2e 0f 00 04 1e 5a 33 db b9 00 20 2b c8 |........Z3... +.|

000000c0 66 ff 06 11 00 03 16 0f 00 8e c2 ff 06 16 00 e8 |f...............|

000000d0 4b 00 2b c8 77 ef b8 00 bb cd 1a 66 23 c0 75 2d |K.+.w......f#.u-|

000000e0 66 81 fb 54 43 50 41 75 24 81 f9 02 01 72 1e 16 |f..TCPAu$....r..|

000000f0 68 07 bb 16 68 52 11 16 68 09 00 66 53 66 53 66 |h...hR..h..fSfSf|

00000100 55 16 16 16 68 b8 01 66 61 0e 07 cd 1a 33 c0 bf |U...h..fa....3..|

00000110 0a 13 b9 f6 0c fc f3 aa e9 fe 01 90 90 66 60 1e |.............f`.|

00000120 06 66 a1 11 00 66 03 06 1c 00 1e 66 68 00 00 00 |.f...f.....fh...|

00000130 00 66 50 06 53 68 01 00 68 10 00 b4 42 8a 16 0e |.fP.Sh..h...B...|

00000140 00 16 1f 8b f4 cd 13 66 59 5b 5a 66 59 66 59 1f |.......fY[ZfYfY.|

00000150 0f 82 16 00 66 ff 06 11 00 03 16 0f 00 8e c2 ff |....f...........|

00000160 0e 16 00 75 bc 07 1f 66 61 c3 a1 f6 01 e8 09 00 |...u...fa.......|

00000170 a1 fa 01 e8 03 00 f4 eb fd 8b f0 ac 3c 00 74 09 |............<.t.|

00000180 b4 0e bb 07 00 cd 10 eb f2 c3 0d 0a 41 20 64 69 |............A di|

00000190 73 6b 20 72 65 61 64 20 65 72 72 6f 72 20 6f 63 |sk read error oc|

000001a0 63 75 72 72 65 64 00 0d 0a 42 4f 4f 54 4d 47 52 |curred...BOOTMGR|

000001b0 20 69 73 20 63 6f 6d 70 72 65 73 73 65 64 00 0d | is compressed..|

000001c0 0a 50 72 65 73 73 20 43 74 72 6c 2b 41 6c 74 2b |.Press Ctrl+Alt+|

000001d0 44 65 6c 20 74 6f 20 72 65 73 74 61 72 74 0d 0a |Del to restart..|

000001e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|

000001f0 00 00 00 00 00 00 8a 01 a7 01 bf 01 00 00 55 aa |..............U.|

00000200

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User profile for user: Loner T
Loner T
User level: Level 9
59,536 points

Sep 5, 2016 4:33 PM in response to Evanisamused

This is a special set of steps, which are not valid for standard Windows/Bootcamp installations.


A. We need to disable SIP.


1. Boot into Local Recovery (Command+R).

2. Start Utilities -> Terminal.

3. Type csrutil disable in Terminal and press Enter/Return.

4. Type csrutil status.

5. Boot normally, and type csrutil status to confirm that all individual entries are still disabled.


B. Rebuild non-standard MBR.


The following steps are non-standard because there is a third user-visible partition. Typically, there are two such partitions in a normal configuration on a single-disk Mac with OS X and Bootcamp. This is fragile and lack of proper backups can lead to potential data loss. Download GPT Fdisk from http://sourceforge.net/projects/gptfdisk/ and install it on the OS X side. The following steps are executed when booted in OS X.


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. Please see thesample Q&A as an example. These steps can be repeated if you make a mistake before you get to Step 12, otherwise start from Step 1 for these steps. Step 6 has numbers which are typed with a space between the numbers. Please see the sample Q&A before you execute these steps.

  1. Sudo gdisk /dev/rdisk1
  2. P (Print list of parts)
  3. R (Recover)
  4. O (print current Hybrid MBR)
  5. H (chooses Hybrid)
  6. Partitions numbers to be hybridized: 2 3
  7. Y (Good for GRUB question)
  8. N (part 2 boot flag)
  9. Y (part 3 boot flag make NTFS bootable partition)
  10. O (print current Hybrid MBR)
  11. W (Write the new MBR)
  12. Y (Yes! write the new MBR)
  13. Reboot


Here is sample Q&A for this section. Please notice the Press Enter/Return. Accept defaults offered by Gdisk.


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


Creating entry for GPT partition #2 (MBR partition #1)

Enter an MBR hex code (default AB): 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 07): Press Enter/Return

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

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Making bootcamp bootable after it's already been installed.

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