Silvetti

Q: Windows 10 External Bootcamp Partition Missing

Hi,

 

I just upgraded to El Capitan and now I can't boot into bootcamp (Windows 10).

I have an installation on a TB SSD drive:

Silvettis-iMac:~ Tommy$ diskutil list

/dev/disk0 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *251.0 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS Macintosh HD            250.1 GB   disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

/dev/disk1 (external, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *256.1 GB   disk1

   1:         Microsoft Reserved                         134.2 MB   disk1s1

   2:       Microsoft Basic Data BOOTCAMP                255.0 GB   disk1s2

   3:           Windows Recovery                         471.9 MB   disk1s3

   4:           Windows Recovery                         472.9 MB   disk1s4

I can see the drive in Finder and check files, I can even go to Settings, Start-Up disk and select to boot from it but when the mac reboots it goes to a black screen saying no data partition can be found.

I already checked other posts here but I'm a bit confused regarding my case

Here are a few outputs from gdisk (I disabled the security thing thru recovery mode):

Found valid GPT with protective MBR; using GPT.

 

Command (? for help): p

Disk /dev/disk1: 500118192 sectors, 238.5 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): 7D3E8214-94DE-4FC2-9608-E0FA1B136543

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 500118158

Partitions will be aligned on 2048-sector boundaries

Total free space is 2669 sectors (1.3 MiB)

 

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

   1            2048          264191   128.0 MiB   0C01  Microsoft reserved ...

   2          264192       498272255   237.5 GiB   0700  Basic data partition

   3       498272256       499193855   450.0 MiB   2700

   4       499193856       500117503   451.0 MiB   2700

Command (? for help): r

 

Recovery/transformation command (? for help): o

 

Disk size is 500118192 sectors (238.5 GiB)

MBR disk identifier: 0x00000000

MBR partitions:

 

Number  Boot  Start Sector   End Sector   Status      Code

   1                     1    500118191   primary     0xEE

 

Recovery/transformation command (? for help):

 

Any idea how to solve this ?

iMac, OS X El Capitan (10.11)

Posted on Oct 1, 2015 11:35 AM

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Q: Windows 10 External Bootcamp Partition Missing

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  • Helpful answers

  • by Loner T,

    Loner T Loner T Oct 1, 2015 12:01 PM in response to Silvetti
    Level 7 (24,795 points)
    Safari
    Oct 1, 2015 12:01 PM in response to Silvetti

    1. What year/model is your Mac?

    2. You have a Windows EFI installation, not the traditional MBR/BIOS.

    3. You have two Windows Recovery parts, which implies that Windows came up and wanted to recover. If you do not see the Recovery console, there may be a GPU driver issue. Do you have an external monitor connected when Recovery comes up.

    4. You can also start Windows Recovery by using Shift or Shift+F8 after switching to Windows from OSX.

  • by Silvetti,

    Silvetti Silvetti Oct 1, 2015 12:19 PM in response to Loner T
    Level 1 (0 points)
    Oct 1, 2015 12:19 PM in response to Loner T

    1. Late 2013 iMac

    2. Got it

    3. No other display connected

    4. I can't star anything Tried shift and shift+f8 it always goes to the black screen saying no bootable partition etc...

  • by Loner T,

    Loner T Loner T Oct 1, 2015 12:26 PM in response to Silvetti
    Level 7 (24,795 points)
    Safari
    Oct 1, 2015 12:26 PM in response to Silvetti

    Can you post the output of

     

    sudo dd if=/dev/rdisk1s2 count=1 2>/dev/null | hexdump -C

     

    Do you have another non-El Capitan Mac with a TB port?

  • by Silvetti,

    Silvetti Silvetti Oct 1, 2015 12:31 PM in response to Loner T
    Level 1 (0 points)
    Oct 1, 2015 12:31 PM in response to Loner T

    Silvettis-iMac:~ Tommy$ sudo dd if=/dev/rdisk1s2 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 08 04 00  |........?.......|

    00000020  00 00 00 00 80 00 80 00  ff ff ae 1d 00 00 00 00  |................|

    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  96 46 2a 8c 66 2a 8c 10  |.........F*.f*..|

    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

     

    No, this is my only Mac currently

  • by Loner T,

    Loner T Loner T Oct 1, 2015 12:41 PM in response to Silvetti
    Level 7 (24,795 points)
    Safari
    Oct 1, 2015 12:41 PM in response to Silvetti

    1. What is the possibility of installing Yosemite on an external drive and booting from it to test if Windows Recovery will work?

    2. Since you have the ability to read the NTFS partition from OSX, can you check boot logs on the NTFS partition?

    3. The error message indicates that there is no NTFS partition pointed to by the MSR. Do you have the original USB installer used to install Windows?

    4. What is the version of Windows?

  • by Silvetti,

    Silvetti Silvetti Oct 1, 2015 2:10 PM in response to Loner T
    Level 1 (0 points)
    Oct 1, 2015 2:10 PM in response to Loner T

    1. Don't have any other external drive

    2. Can't find any boot log (googled for usual places)

    3. I don't have the original USB installation stick but I can make one

    4. Windows 10 the latest build from end of August (not sure if there's a new one)

  • by Loner T,

    Loner T Loner T Oct 1, 2015 3:37 PM in response to Silvetti
    Level 7 (24,795 points)
    Safari
    Oct 1, 2015 3:37 PM in response to Silvetti

    You can install OS X on a USB Flash drive, even though it will be slow - How to install OS X on an external drive connected to your Mac - Apple Support .

     

    There is a licensing restriction on Windows on portable media. Thunderbolt using PCI bypasses it. Can you check the OS X side Applications -> Utilities-> Console logs for any error messages related to your TB and/or SSD?