Q: [Help] Can't boot to windows (8.1) after resizing partition

Look at the sample Q&A in my post.

This looks good. Please reboot and test OS X and Windows.

If you merge the 79GB using Gparted into the Windows partiton, you will need to recreate the MBR. Use 2 3 4 instead of 3 4 5 after you merge the two partitions.

Thanks for this posting!

My situation wasI resized my mac partition to make a shared partition for xfering files MAC<-> WIN.

I couldn't find my bootcamp upon startup but following same steps as this post fixed my issue. 

Here are the characteristics of my drive if anyone else has the same situation.

iMac:~ brian$ diskutil list

/dev/disk0 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *2.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS iMAC                    1.4 TB     disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:       Microsoft Basic Data SHARED                  250.5 GB   disk0s4
   5:       Microsoft Basic Data                         398.5 GB   disk0s5
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$ discutil cs list
-bash: discutil: command not found
iMac:~ brian$ diskutil cs list
No CoreStorage logical volume groups found
iMac:~ brian$ diskutil cs list
No CoreStorage logical volume groups found
iMac:~ brian$ sudo fdisk /dev/disk0
Password:
Disk: /dev/disk0    geometry: 243201/255/63 [3907029168 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: AF 1023 254  63 - 1023 254  63 [    409640 - 2637526224] HFS+       
3: AB 1023 254  63 - 1023 254  63 [2637935864 -    1269544] Darwin Boot
4: 0B 1023 254  63 - 1023 254  63 [2639205408 -  489165792] Win95 FAT-32
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$ sudo gpt -v -r show /dev/disk0
gpt show: /dev/disk0: mediasize=2000398934016; sectorsize=512; blocks=3907029168
gpt show: /dev/disk0: Suspicious MBR at sector 0
       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  2637526224      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  2637935864     1269544      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
  2639205408   489165792      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
  3128371200      262144        
  3128633344   778395648      5  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
  3907028992         143        
  3907029135          32         Sec GPT table
  3907029167           1         Sec GPT header
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$ sudo fdisk /dev/disk0
Disk: /dev/disk0    geometry: 243201/255/63 [3907029168 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: AF 1023 254  63 - 1023 254  63 [    409640 - 2637526224] HFS+       
3: AB 1023 254  63 - 1023 254  63 [2637935864 -    1269544] Darwin Boot
4: 0B 1023 254  63 - 1023 254  63 [2639205408 -  489165792] Win95 FAT-32
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$
iMac:~ brian$ sudo dd if=/dev/rdisk0s5 count=1 2>/dev/null | hexdump -C
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 28 7b ba  |........?....({.|
00000020  00 00 00 00 80 00 80 00  ff 4f 57 2e 00 00 00 00  |.........OW.....|
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  50 d5 c7 d6 14 c8 d6 f4  |........P.......|
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$....r..|
000000f0  68 07 bb 16 68 52 11 16  68 09 00 66 53 66 53 66  |h...hR..h..fSfSf|
00000100  55 16 16 16 68 b8 01 66  61 0e 07 cd 1a 33 c0 bf  |U...h..fa....3..|
00000110  0a 13 b9 f6 0c fc f3 aa  e9 fe 01 90 90 66 60 1e  |.............f`.|
00000120  06 66 a1 11 00 66 03 06  1c 00 1e 66 68 00 00 00  |.f...f.....fh...|
00000130  00 66 50 06 53 68 01 00  68 10 00 b4 42 8a 16 0e  |.fP.Sh..h...B...|
00000140  00 16 1f 8b f4 cd 13 66  59 5b 5a 66 59 66 59 1f  |.......fY[ZfYfY.|
00000150  0f 82 16 00 66 ff 06 11  00 03 16 0f 00 8e c2 ff  |....f...........|
00000160  0e 16 00 75 bc 07 1f 66  61 c3 a1 f6 01 e8 09 00  |...u...fa.......|
00000170  a1 fa 01 e8 03 00 f4 eb  fd 8b f0 ac 3c 00 74 09  |............<.t.|
00000180  b4 0e bb 07 00 cd 10 eb  f2 c3 0d 0a 41 20 64 69  |............A di|
00000190  73 6b 20 72 65 61 64 20  65 72 72 6f 72 20 6f 63  |sk read error oc|
000001a0  63 75 72 72 65 64 00 0d  0a 42 4f 4f 54 4d 47 52  |curred...BOOTMGR|
000001b0  20 69 73 20 63 6f 6d 70  72 65 73 73 65 64 00 0d  | is compressed..|
000001c0  0a 50 72 65 73 73 20 43  74 72 6c 2b 41 6c 74 2b  |.Press Ctrl+Alt+|
000001d0  44 65 6c 20 74 6f 20 72  65 73 74 61 72 74 0d 0a  |Del to restart..|
000001e0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000001f0  00 00 00 00 00 00 8a 01  a7 01 bf 01 00 00 55 aa  |..............U.|
00000200
iMac:~ brian$

Please back up OS X, Windows and create a Windows System restore point.

I got the same problem. I tried your step by step and got an error at the end.

MacBook-Pro-de-Antoine:~ antoinerivard$ csrutil status

System Integrity Protection status: enabled.

MacBook-Pro-de-Antoine:~ antoinerivard$ sudo gdisk / dev/rdisk0

Password:

GPT fdisk (gdisk) version 1.0.1

Usage: gdisk [-l] device_file

MacBook-Pro-de-Antoine:~ antoinerivard$ p

-bash: p: command not found

MacBook-Pro-de-Antoine:~ antoinerivard$ 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!

NOTE: Write test failed with error number 1. It will be impossible to save

changes to this disk's partition table!

You may need to deactivate System Integrity Protection to use this program. See

https://www.quora.com/How-do-I-turn-off-the-rootless-in-OS-X-El-Capitan-10-11

for more information.

Partition table scan:

  MBR: protective

  BSD: not present

  APM: not present

  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): p

Disk /dev/rdisk0: 977105060 sectors, 465.9 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): 0BD1259A-903C-4656-966F-B0C23658D73F

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 977105026

Partitions will be aligned on 8-sector boundaries

Total free space is 262281 sectors (128.1 MiB)

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

   1              40          409639   200.0 MiB   EF00  EFI System Partition

   2          409640       762128383   363.2 GiB   AF00  Mac Antoine

   3       762128384       763397927   619.9 MiB   AB00  Recovery HD

   4       763397928       781531135   8.6 GiB     AF00  Sans titre

   5       781793280       977104895   93.1 GiB    0700  BOOTCAMP

Command (? for help): r

Recovery/transformation command (? for help): o

Disk size is 977105060 sectors (465.9 GiB)

MBR disk identifier: 0xC27FC94D

MBR partitions:

Number  Boot  Start Sector   End Sector   Status      Code

   1                     1    977105059   primary     0xEE

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: 3 4 5

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

Creating entry for GPT partition #3 (MBR partition #2)

Enter an MBR hex code (default AB):

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

Creating entry for GPT partition #4 (MBR partition #3)

Enter an MBR hex code (default AF):

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

Creating entry for GPT partition #5 (MBR partition #4)

Enter an MBR hex code (default 07):

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

Recovery/transformation command (? for help): o

Disk size is 977105060 sectors (465.9 GiB)

MBR disk identifier: 0xC27FC94D

MBR partitions:

Number  Boot  Start Sector   End Sector   Status      Code

   1                     1    762128383   primary     0xEE

   2             762128384    763397927   primary     0xAB

   3             763397928    781531135   primary     0xAF

   4      *      781793280    977104895   primary     0x07

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!

Unable to open device '/dev/rdisk0' for writing! Errno is 1! Aborting write!

When I went in Terminal in recovery mode, I type csrutil disable, but wasn't working.

Can you help me?

Thx

Tonyrivard18 wrote:

 

NOTE: Write test failed with error number 1. It will be impossible to save

changes to this disk's partition table!

You may need to deactivate System Integrity Protection to use this program. See

You need to boot into Local Recovery (Command+R) and run csrutil status and and then csrutil disable. Internet Recovery will not work.

I boot with cmb+R and i went in terminal :

-bash-3,2# csrutil status

-bash: csrutil: command not found

I am not sure if when I boot with cmd+R if i'm really in Local Recovery or in Internet Recovery. It ask me to connect on my wifi.

You are in Internet Recovery. Your Local Recovery seems to be corrupted.

If I boot with ALT key and I chose the other disk (I think it's recuperation), will it do the same thing as local recovery?

You can try it, but Command+R will try that partition first. If it find any issues, it will fall back to Internet Recovery. If you are being asked for your Wireless connection information, your Mac is using Internet Recovery.