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User profile for user: ylee198
ylee198 Author
User level: Level 1
8 points

Failed to booting Windows 10 with bootcamp

Hi guys,


I have been using iMac and bootcamp for Windows 10 successfully. In recent years, I only use windows and never use the macOS side.

Recently, I decided to use both Win and Mac for some reasons, and updated my MacOS to the latest version (Catalina, 10.15.6).


The problem appears after updating the macOS successfully when I tried to reboot with windows by selecting "BOOTCAMP Windows" in Startup disk panel in system preferences.

It just failed and the black screen showed up saying "No bootable device --insert boot disk and press any key".

After seeing that, I turned off Mac and restart it using power button, while pressing Option(Alt) key to select startup disk option using startup manager (in booting time). Strangely, however, only the "Macintosh HD" disk option appears and the "Bootcamp Windows 10" disk option does not show up.


Therefore, at this time, i have no way to go back to the Windows 10 (By the way, the files and directories in Bootcamp partition can be found and accessed with Finder app which at least shows that the partition and Windows are not completely destroyed).

I am not sure whether the update of MacOS is the reason of the problem.

Can anyone give some advice to solve this problem and successfully boot with windows?


Many thanks in advance.



iMac Line (2012 and Later)

Posted on Sep 3, 2020 9:51 PM

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User profile for user: Loner T
Loner T
User level: Level 9
59,526 points

Posted on Sep 6, 2020 10:02 AM

The default installation mode on a late 2013 Mac is legacy BIOS. macOS Catalina can delete the MBR. Are you able to see Windows files in macOS Finder? If yes, the issue can be corrected fairly easily.


Also, from macOS Terminal, post the output of


sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0


You may need to temporarily disable SIP in Local Recovery using csrutil.

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User profile for user: Loner T
Loner T
User level: Level 9
59,526 points

Sep 6, 2020 10:02 AM in response to ylee198

The default installation mode on a late 2013 Mac is legacy BIOS. macOS Catalina can delete the MBR. Are you able to see Windows files in macOS Finder? If yes, the issue can be corrected fairly easily.


Also, from macOS Terminal, post the output of


sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0


You may need to temporarily disable SIP in Local Recovery using csrutil.

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User profile for user: ylee198
ylee198 Author
User level: Level 1
8 points

Sep 6, 2020 5:08 PM in response to Loner T

Thanks for the detailed explanation.


I can see the Window files in macOS Finder.


Following lines are the output of the command: sudo gpt -vv -r show /dev/disk0

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

gpt show: /dev/disk0: mediasize=121332826112; sectorsize=512; blocks=236978176

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 236978175

      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  236568496      2  GPT part - 7C3457EF-0000-11AA-AA11-00306543ECAC

  236978136          7         

  236978143         32         Sec GPT table

  236978175          1         Sec GPT header

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



Also, the following is the output of the command: sudo fdisk /dev/disk0

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

Disk: /dev/disk0 geometry: 14751/255/63 [236978176 sectors]

Signature: 0xAA55

         Starting       Ending

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

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

 1: EE 1023 254  63 - 1023 254  63 [         1 -  236978175] <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      

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


thanks.

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User profile for user: ylee198
ylee198 Author
User level: Level 1
8 points

Sep 6, 2020 7:11 PM in response to Loner T

You are right. It seems that disk1 is for Bootcamp and disk2 is for Macintosh.

Output of the comments for the disk1 is as follows:

>> sudo gpt -vv -r show /dev/disk1


gpt show: /dev/disk1: mediasize=1000204886016; sectorsize=512; blocks=1953525168

gpt show: /dev/disk1: Suspicious MBR at sector 0

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

gpt show: /dev/disk1: Sec GPT at sector 1953525167

       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   777334744      2  GPT part - 7C3457EF-0000-11AA-AA11-00306543ECAC

   777744384  1175779328      3  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  1953523712        1423         

  1953525135          32         Sec GPT table

  1953525167           1         Sec GPT header

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


>> sudo fdisk /dev/disk1


Disk: /dev/disk1 geometry: 121601/255/63 [1953525168 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: FF 1023 254  63 - 1023 254  63 [    409640 -  777334744] Xenix BBT   

 3: 0C 1023 254  63 - 1023 254  63 [ 777744384 - 1175779328] Win95 FAT32L

 4: 00    0   0   0 -    0   0   0 [         0 -          0] unused      



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User profile for user: ylee198
ylee198 Author
User level: Level 1
8 points

Sep 7, 2020 7:14 AM in response to Loner T

Thanks again for your kindness!


Output of the commands you said is as follows:


sudo fdisk -e /dev/disk1

fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory

Enter 'help' for information


fdisk: 1> p

Disk: /dev/disk1 geometry: 121601/255/63 [1953525168 sectors]

Offset: 0 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: FF 1023 254  63 - 1023 254  63 [    409640 -  777334744] Xenix BBT   

 3: 0C 1023 254  63 - 1023 254  63 [ 777744384 - 1175779328] Win95 FAT32L

 4: 00    0   0   0 -    0   0   0 [         0 -          0] unused      


fdisk: 1> setpid 3

         Starting       Ending

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

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

 3: 0C 1023 254  63 - 1023 254  63 [ 777744384 - 1175779328] Win95 FAT32L

Partition id ('0' to disable)  [0 - FF]: [C] (? for help) 07

fdisk:*1> flag 3

Partition 3 marked active.


fdisk:*1> p

Disk: /dev/disk1 geometry: 121601/255/63 [1953525168 sectors]

Offset: 0 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: FF 1023 254  63 - 1023 254  63 [    409640 -  777334744] Xenix BBT   

*3: 07 1023 254  63 - 1023 254  63 [ 777744384 - 1175779328] HPFS/QNX/AUX

 4: 00    0   0   0 -    0   0   0 [         0 -          0] unused      



fdisk:*1> 


Thanks.

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Failed to booting Windows 10 with bootcamp

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