jdavidlawence

Q: Windows Missing from Boot Screen

This thread is started in response to Loner T's advice on this thread: Repairing Boot Camp after creating new partition

 

I have a hard drive with a partition for Yosemite and an NTFS partition for Windows 10. I just resized the Yosemite partition, and now I can no longer boot into windows as it's not listed on the boot screen when holding "Alt". It does still show up as a boot option in Startup Disk and I can view the contents of the partition. When trying to boot windows from the Startup Disk option, I just get a blinking cursor.

 

sudo fdisk -e /dev/disk0

p

setpid 4

07

flag 4

p

write

y

 

Loner T, I'm guessing the above commands will work in my case as well, but would just like to verify before I destroy something. I've posted the output from the commands you requested in the original thread. Thoughts? Thanks in advance!




sh-3.2# fdisk /dev/disk0

Disk: /dev/disk0 geometry: 29185/255/63 [468862128 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 -  193750000] HFS+       

3: AB 1023 254  63 - 1023 254  63 [ 194159640 -    1269536] Darwin Boot

4: 0C 1023 254  63 - 1023 254  63 [ 312612864 -  156248064] Win95 FAT32L

 

 

 

sh-3.2# gpt  -v -r show /dev/disk0

gpt show: /dev/disk0: mediasize=240057409536; sectorsize=512; blocks=468862128

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  193750000      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  194159640    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

  195429176  117183688        

  312612864  156248064      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  468860928       1167        

  468862095         32         Sec GPT table

  468862127          1         Sec GPT header

 

 

 

sh-3.2# diskutil list

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *240.1 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS OSX                     99.2 GB    disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

   4:       Microsoft Basic Data                         80.0 GB    disk0s4

/dev/disk1

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *2.0 TB     disk1

   1:                        EFI EFI                     209.7 MB   disk1s1

   2:                  Apple_HFS Storage                 2.0 TB     disk1s2

/dev/disk2

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:     Apple_partition_scheme                        *17.2 MB    disk2

   1:        Apple_partition_map                         32.3 KB    disk2s1

   2:                  Apple_HFS Flash Player            17.1 MB    disk2s2

sh-3.2#

Mac Pro, OS X Yosemite (10.10.5)

Posted on Nov 21, 2015 3:24 PM

Close

Q: Windows Missing from Boot Screen

  • All replies
  • Helpful answers

  • by Loner T,

    Loner T Loner T Nov 21, 2015 4:10 PM in response to jdavidlawence
    Level 7 (24,307 points)
    Safari
    Nov 21, 2015 4:10 PM in response to jdavidlawence

    Please post the output of

     

    sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C

     

    What was the intent behind resizing the Yosemite partition?

  • by jdavidlawence,

    jdavidlawence jdavidlawence Nov 21, 2015 4:24 PM in response to Loner T
    Level 1 (4 points)
    Apple Music
    Nov 21, 2015 4:24 PM in response to Loner T

    Hi Loner T,

     

    Thanks for the quick reply. I misgauged the amount of size I needed for the Windows partition and ran out of space. I reduced the OS X partition size in order to increase the Windows partition size. Not sure if this is important or evident in the output, but there is now some unallocated space that I plan to use to increase the Windows partition size once I can boot back into it.

     

    Ok, here is the requested output:

     

    sh-3.2# sudo dd if=/dev/rdisk0s4 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 18 a2 12  |........?.......|

    00000020  00 00 00 00 80 00 80 00  ff 17 42 09 00 00 00 00  |..........B.....|

    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  fc 13 55 c2 35 55 c2 1c  |..........U.5U..|

    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

    sh-3.2#

  • by Loner T,Solvedanswer

    Loner T Loner T Nov 21, 2015 5:08 PM in response to jdavidlawence
    Level 7 (24,307 points)
    Safari
    Nov 21, 2015 5:08 PM in response to jdavidlawence

    Try the Fdisk commands. If they do not work, then we are looking at running Testdisk to find the correct partition headers. If the change was resizing OS X (not Windows) then these should work.

  • by jdavidlawence,

    jdavidlawence jdavidlawence Nov 23, 2015 10:38 AM in response to Loner T
    Level 1 (4 points)
    Apple Music
    Nov 23, 2015 10:38 AM in response to Loner T

    Loner T,

     

    Amazing, that worked! Thanks so much for your help.

     

    Now I just have to figure out how to expand the NTFS partition, which I understand can't be done from OSX. Looks like it's not even possible with the standard windows disk management. I'll look into it further...

     

    Thanks again!

  • by Loner T,

    Loner T Loner T Nov 23, 2015 12:38 PM in response to jdavidlawence
    Level 7 (24,307 points)
    Safari
    Nov 23, 2015 12:38 PM in response to jdavidlawence

    You will need to use a Live Linux CD (or any other toolset) and use Gparted to resize the Windows partition. Please ensure you backup all your Windows and OSX data first.